下面是小编为大家整理的六年级专项试题：连乘，本文共12篇，供大家参考借鉴，希望可以帮助您。本文原稿由网友“易桓生”提供。
篇1：六年级专项试题：连乘
最新六年级专项试题：连乘
有3个不同的'数字，排列3次，组成了3个三位数，这3个三位数相加之和为789，又知运算中没有进位，那么这3个数字连乘所得的积是多少?
答案：10或者12
解析：由题意，3个三位数的百位之和为7，十位数之和为8，个位数之和为9，而在每个三位数里，3个数字都各出现了一次。所以我们把百位之和、十位之和、个位之和再加在一起，就应该等于把三个数字各加了3次，也就等于3个数字之和的3倍。由于7+8+9=24，也即3个数字之和的3倍为24，从而3个数字之和为8.
又由题意，3个数字互不相同。而3个数字互不相同，其和又等于8，容易知道3个数字只能是1、2、5或者1、3、4.题目要求3个数字连乘的积，所以答案是1×2×5=10或者1×3×4=12
篇2：GRE专项试题
GRE专项试题集锦
8.Scientist：More than 1, 000 large asteroids regularly
cross the Earth’s path．Even though the probabil-
ity of one colliding with the Earth is extremely
slight, we should do whatever we can to reduce
that probability since any such collision would
be catastrophic．The best way to avoid such a
disaster is to deflect the asteroids．The only
known way of deflecting asteroids is by hitting
them with nuclear weapons that would be stored
in space stations．
The scientist’s claims are structured so as to lead to
which of the following conclusions？
(A)Nuclear technology is the only technology that
can plausibly be used to prevent natural
catastrophes．
(B)Nuclear weapons should be deployed in space．
(C)No catastrophe has yet been caused by the
collision of an asteroid with the Earth．
(D)The 1, 000 large asteroids that cross the Earth’s
path pose only an extremely slight risk of
colliding with the Earth．
(E)There is currently no acceptable use to which
nuclear weapons can be put, aside from pro-
tecting the Earth from asteroids．
9.It has long been thought that high levels of the hor-
mone testosterone contribute to the onset of heart
disease in men．However, this view cannot be correct,
since men who have heart disease typically show
significantly lower levels of testosterone than do men
who have not had heart disease．
The argument above assumes which of the following？
(A)Many men who have never had heart disease
have unusually low levels of testosterone．
(B)Having heart disease does not significantly lower
the level of testosterone in men．
(C)Levels of hormones other than testosterone
significantly affect the likelihood that a man
will develop heart disease．
(D)Heart disease and lowered testosterone levels in
men are the effects of a single common cause．
(E)High levels of testosterone have never been
thought to contribute to a serious disease other
than heart disease
10.The time-out technique involves removing the child from
an undesirable situation in order to let the child think
things over．Over the last two decades, family doctors
have been advocating this technique as preferable to
spanking, which is now known to be potentially injurious
and no more effective．
10.Which of the following can properly be concluded
from the data presented in the graph？
(A)The 1962 survey was based on a larger sample
than the 1992 survey was．
(B)In the period between the surveys, denying tele-
vision privileges was never the disciplinary
technique most popular with parents．
(C)The four disciplinary techniques featured in the
graph were the only disciplinary techniques
named by parents in either survey．
(D)The 1962 survey allowed parents to name more
than one disciplinary technique, but the 1992
survey may not have allowed this．
(E)In the period between the surveys, there were
no significant changes in the popularity of lec-
turing children as a disciplinary method．
11.People who engage in scuba diving are healthier, on
average, than people who do not engage in this
activity．Therefore, scuba diving tends to promote
improved health．
The argument is most vulnerable to criticism on the
grounds that it
(A)presupposes that everyone who takes up scuba
diving does so solely for health reasons
(B)leads to a further and falsifiable conclusion that
no one can achieve good health without
engaging in scuba diving
(C)fails to point out that a small number of people
are seriously injured in scuba diving accidents
each year
(D)treats a precondition for improving one’s health
as though it were something that by itself
could ensure good health
(E)overlooks the possibility that people generally do
not take up scuba diving unless they are in
good health
Questions 12-15
An art museum owns six paintings by an eighteenth-
century painter．The paintings, listed in order by esti-
mated value from lowest to highest, are F, G, H, S, T,
and U．Paintings F, G, and H are landscapes; S, T, and U
are portraits．At any one time, exactly three of the six
paintings are on exhibit, subject to the following
restrictions:
The paintings on exhibit cannot all be landscapes．
If the exhibit includes only one portrait, that portrait
must be U．
H cannot be on exhibit at any time that T is on exhibit.
12.Which of the following could be the three paintings
on exhibit at some point？
(A)F, G, and H
(B)F, G, and T
(C)G, H, and S
(D)G, S, and U
(E)H, T, and U
13.Which of the following, if they are the first two
paintings selected for inclusion in a future exhibit,
leave the widest choice of paintings for the third
painting in that future exhibit？
(A)F and G
(B)G and H
(C)H and U
(D)S and T
(E)S and U
篇3：六年级数学教案《分数的连乘》
六年级数学教案《分数的连乘》
六年级数学教案《分数的连乘》
1、学会计算分数的连乘，知道分数连乘的简便算法和计算时约分的简便方法。
2、培养学生应用知识的能力和计算能力，提高分数乘法计算的'熟练程度。
教学重难点
分数连乘的简便算法和计算时约分的简便方法。
教学准备
教学过程设计
教学内容
师生活动
备注
一、复习
二、新课教学
1、P1312题口算
2、笔算9/149/10
问：分数乘法怎样计算？怎样约分计算比较简便？
1、教学例4
（1）出示例4
问：这样的乘法算式你能算吗？
（2）讨论计算过程
问：有没有不同的算法？
（3）比较不同算法。
问：两种算法各是怎样算的？
你认为哪种算法比较简便？怎样计算比较简便？
2、归纳方法
问：今天的分数乘法，和以前计算的分数乘法有什么不同？在计算时它是怎样乘？
三：巩固练习
1、做练一练
2、做练习二15、16题
四、课堂小结
这节课学习了什么内容？分数连乘怎样算比较简便？
五、作业
练习二第13、14、17
课后感受
在三个数一起约分的过程中，特别提醒学生注意约分是分子和分母约。
篇4：六年级数学教案《分数的连乘》
教学重难点
分数连乘的简便算法和计算时约分的简便方法。
教学准备
教学过程设计
教学内容
师生活动
备注
一、复习
二、新课教学
1、P1312题口算
2、笔算9/149/10
问：分数乘法怎样计算？怎样约分计算比较简便？
1、教学例4
（1）出示例4
问：这样的乘法算式你能算吗？
（2）讨论计算过程
问：有没有不同的算法？
（3）比较不同算法。
问：两种算法各是怎样算的.？
你认为哪种算法比较简便？怎样计算比较简便？
2、归纳方法
问：今天的分数乘法，和以前计算的分数乘法有什么不同？在计算时它是怎样乘？
三：巩固练习
1、做练一练
2、做练习二15、16题
四、课堂小结
这节课学习了什么内容？分数连乘怎样算比较简便？
五、作业
练习二第13、14、17
课后感受
在三个数一起约分的过程中，特别提醒学生注意约分是分子和分母约。
篇5：全新六年级专项试题之取棋子
全新六年级专项试题之取棋子
奥数是一种理性的精神，使人类的思维得以运用到最完善的程度.让我们一起来阅读最新六年级专项试题之取棋子,感受奥数的奇异世界!
有个棋子，两人轮流取子，每次允许取其中的2个、4个或8个，谁最后取完棋子，就算获胜。那么先取的人为保证获胜，第一次应取几个棋子?
答案：4个。
分析：本题我们需要去找“必胜数”。因为棋子的总数是偶数，并且每次取的个数也是偶数，所以每次剩下的棋子的个数也一定是偶数。
如果先取的人取到某一次后，还剩下2个、4个或者8个棋子的话，无疑是别人获胜了。那如果恰好只剩下6个呢?无论别人怎么取，都可以保证自己获胜。看来6是一个必胜数。我们继续往上找，不难发现，凡是6的'倍数就一定是必胜数。
1996÷6=332……4
所以想保证获胜，先取的人应该先取4个棋子。
详解先取的人先取4个棋子。如果后取的人取2个或者8个棋子的话，他就取4个棋子;如果后取的人取4个棋子的话，他就取2个或者8个棋子。这样就能保证在自己取完后，棋子的个数是6的倍数，确保了自己的获胜。
篇6：数学专项练习试题
数学专项练习试题大全
一、填空我能行，全部填对才真行。
1. 60606000是一个(???? )位数，这个数读作(??????????????????? );从左往右数第二个6在(???? )位上，第三个6表示6个(???? )。
2. 38 ：16 可化简为(???? )，比值是(??? )。
3. 一个两位数既是5的倍数，也是3的倍数，而且是偶数，这个数最小是(?? )，最大是(?? )。
4. 0.25=( )÷( )=2∶( )=6( ) =( )%
5.我国香港特别行政区的总面积是十一亿零四百万平方米，写作(??????????? )平方米，改写成用“万平方米”作单位(????????? )。
6.三个连续偶数的和是36，这三个偶数是(??? )、(??? )和(??? )。
7.观察并完成序列：0、1、3、6、10、( )、21、( )。
8.20以内不是偶数的合数是(?????? )，不是奇数的质数是(???? )。
9. 在一条长50米的大路两旁，每隔5米栽一棵树(两端都要栽)，一共可栽( )棵树。
10.如果a和b是不为0的两个连续自然数，那么a、b的最小公倍数是(??? )，最大公因数是(??? )。
11.将一条57 米长的绳子平均截成5段，每段占这条绳子的( )( ) ，每段长(? )米。
12.一个比例的两个内项互为倒数，一个外项是 ，另一个外项是( )。
13.把0.4(?)5(?)、46%、0.45(?)、920 按从大到小的顺序排列为( ??? )。
14.被减数减去减数，差是0.4，被减数、减数与差的和是2，减数是( )。
二、判断我也行，包公断案最分明。
1.分母是8的最简真分数有4个。???????????????????????? (?? )
2.一个自然数不是质数，就是合数。?????????????????????? (?? )
3. 4100÷800=41÷8=5……1。????????????????????????? ( )
4.比例尺是1：500，表示图上1厘米代表实际距离的500米。 (?? )
5.310 里面有3个0.1。?????????????????????????????????? (?? )
6.含有未知数的式子就是方程。?????????????????????????? (?? )
7. 915 不能化成有限小数。?????????????????????????????? (?? )
8. 12÷3=4，所以12是倍数，3是因数。????????????????? (?? )
三、选择我更行，去伪存真心里明。
1.下列说法正确的是(??? )。
A.0是最小的数?????????? B.0既是正数又是负数
C.负数比正数小?????????? D.数轴上-4在-7的左边
2.出油率一定，香油的质量和芝麻的质量(???? )。
A.成正比例?? B.成反比例?? C.不成比例?? D.无法确定
3.商店里九五折出售的.商品，比原价(???? )。
A.提高5%??? B.降低5%???? C.提高95%????? D.降低95%
4.一个两位数，个位上的数字是5,十位上的数字是a，表示这个两位数的式子是(??? )。
A.50+a??????? B.5+a??????? C.5+10a?????? D.15a
5.一项工程，甲队单独做要8天完成，乙队单独做要6天完成。甲队和乙队的工作效率比是( )。
A.8：6 ???? B.4：3 ???? C. ： ?? D. ：
6. 一个小数，小数点向左移动一位后，再向右移动三位后是274，这个小数原来是(? )。
A.0.274 ??? B.27.4????????? C.2.74 ???? D.0.0274
7. 在比例尺是1：1000000的地图上，图上距离为10厘米的两地，实际距离是( )千米。
A.100000 B.100 ????? C.1000 ???? D.10000
8.甲数(甲数不为0)的58 等于乙数的67 ，则甲数( )乙数。
A.大于???? B.等于??????? C.小于????????? D.无法比较
9.两根同样长的绳子，甲绳用去14 ，乙绳用去14 米，则两根绳子( )。
A.甲剩下的长一些 ??????? B. 乙剩下的长一些
C. 甲、乙剩下的一样长 ????? D. 无法判断谁剩下的长
四、计算题要仔细。
1.直接写得数。
3.6+5.4=????? 650-100=???? 0.008×1000=????? 70÷0.01=
2.8×0.5=?????? 25÷14 =?????? 1÷35 =??????????? 712 ×914 =
13 +56 +23 =????????? 45 ×0.25+3=
2.怎样简便怎样算。
2.87+5.6-0.87+4.4???????? (115 +317 )×15×17
1.7×102?????????????????????? 1.25×0.32×250
3.5×45 +5.5×80%+0.8 ? 3.68―0.82―0.18
3.求未知数x。
7.2x-5.4x=25.2??????? 13x+17=108 ? 2.4x =22.5
五、解决问题。
1.新华书店去年全年接待读者120万人。上半年接待读者的人数是全年的 ，第四季度接待读者的人数是上半年的 ，第四季度接待读者多少人?
2.一个晒盐场用100克的海水，可以晒出3克盐。如果一块盐田一次放入5000吨的海水，可以晒出多少吨盐?
3.有红、黄两种颜色的花147朵。如果两种花的数量比是3∶4，那种颜色的花多?多多少朵?
4.小明看一本书，已经看的页数与总页数的比是1：3，再看15页，则正好看完全书的50%。这本书共有多少页?
5.一份稿件，甲单独录入需5小时完成，乙单独录入需4小时完成。这份稿件先由甲录入2小时后，剩下的两人合录，还需多长时间才能录完?
数学网小学频道为大家提供了数学专项练习试题，希望大家抓紧时间复习，在考试中取得好的成绩。
篇7：高一年级英语语法专项试题
1. Charles Babbage is generally considered ________the first computer.
A. to have invented B. inventing C. to invent D. having invented
2. Little Jim should love ________to the theatre this evening.
A. to be taken B. to take C. being taken D. taking
3. ― I usually go there by train.
― Why not ________by boat for a change?
A. to try going B. trying to go C. to try and go D. try going
4. John was made ________the truck for a week as a punishment.
A. to wash B. washing C. wash D. to be washing
5. She reached the top of the hill and stopped ________on a big rock by the side of the path.
A. to have rested B. resting C. to rest D. rest
6. She pretended________ me when I passed by.
A. not to see B. not seeing C. to not see D. having not seen
7. Though he had often made his sister ________, today he was made ________by his sister.
A. cry; to cry B. crying; crying C. cry; crying D. to cry; cry
8. Tell him ________the window.
A. to shut not B. not to shut C. to not shut D. don’t’ shut
9. ________her sick to think of the matter.
A. That made B. That caused C. It made D. It caused
10. The woman’s job is ________after the disable children.
A. look B. looks C. looked D. to look
11. She ________to ________everything.
A. demanded; tell B. demanded; be told C. required; tell D. required; be told
12. It’s time ________our league meeting.
A. to begin B. beginning C. that we begin D. that we’ll begin
13. That day I was the last one ________the experiment.
A. made B. making C. to make D. having made
14. I’m hungry. Get me something ________.
A. to be eaten B. to eat C. eating D. to be eating
15. Would you ________me to show you around the place?
A. let B. like C. mind D. care
16. She is said ________the necklace.
A. that she lost B. that she has lost C. to lose D. to have lost
17. What do you think is the best way ________the problem?
A. to settling B. in which settling C. to settle D. settling
18. You are ________retell the story.
A. ought B. ought to C. expecting D. expected to
19. I didn’t want the problem ________again.
A. to raise B. to be raised C. being raised D. be raised
20. Have you had the nurse ________your son’s temperature?
A. to take B. taking C. take D. taken
21. First we should find a hotel ________for the night.
A. to put up at it B. in order to put up at C. at where to put up D. at which to put up
22. ________wake me up when you come in.
A. You’d better not to B. You’d better not C. You hadn’t better to D. You hadn’t better
23. I don’t think you need ________ today.
A. to leave B. to be leaving C. leaving D. being left
24. We have been looking for the girl all the morning, but she is no where ________.
A. to see B. to be seen C. being seen D. seen
25. He should ________for what he has done.
A. praise B. be praised C. have praised D. to be praised
26. He felt a stone ________his back.
A. hitting B. to hit C. hitted D. hit
27. I hurried to school, only ________out it was Sunday.
A. find B. to find C. found D. would find
28. Here are some exercises that need________ after class.
A. done B. to be done C. being done D. to do
29. I’ve been waiting for half an hour ________me the phone call.
A. to give B. for you giving C. of you to give D. for you to give
30. Everything ________smoothly.
A. seems going B. seems to be going C. is seeming to go D. is seeming to be going
31. It was thoughtful ________us the map of the city.
A. of you to send B. for you to send C. of you sending D. for you sending
32. You are fortunate ________as a member of the club.
A. being accepted B. to accept C. To have accepted D. to have been accepted
33. ________wasn’t pleasant ________up so early.
A. He; to wake B. He; to be waken C. It; of him to wake D. It; to be woken
34. I find these problems are easy________.
A. to work out B. to be worked out C. in working out D. to be worked them out
35. How rude ________him ________a child like that.
A. of; to treat B. for; to treat C. of; is to treat D. for; is to treat
36. It was stupid ________him ________attend the lecture.
A. of; to not B. of; not to C. for; to not D. for; not to
37. It was impossible ________lost time to ________.
A. for; make up B. of; make up C. for; be made up D. of; be made up
38. The shoes are too large ________.
A. to me to wear B. for me to wear C. to me to be worn D. for me to be worn
39. ________was sorry________ made such a silly mistake.
A. It; to have B. It; having C. I ; to have D. I; having
40. I’ll be delighted ________.
A. when I’ll see you again B. to see you again
C. that I see you again D. to have seen you again
41. He was ________tired ________any further.
A. too; walking B. too; to walk C. so; walking D. so; to walk
42. Will you be ________kind ________make tea for me?
A. so; to B. fairly; to C. so; as to D. fairly; as to
43. The chair looks rather hard, but in fact it is very comfortable to ________.
A. sit B. sit on C. be sat D. be sat on
44. I ________how to answer the question.
A. puzzle B. am puzzling C. have puzzled D. am puzzled
45. Have you decided ________the party?
A. whether you hold B. why to hold C. whether to hold D. if to hold
46. He doesn’t know ________to stay or not.
A. if B. either C. neither D. whether he ought
47. Last summer I took a course on ________.
A. how to make dresses B. how dresses be made
C. how to be made dresses D. how dresses to be made
48. He hesitated ________ the medicine.
A. taking B. about to take C. whether he take D. whether to take
49. How do the birds know exactly ________ direction ________?
A. which, flying B. which; to fly to C. in which; to fly D. X; flying to
50. ― I don’t know ________with the problem.
― Why not ________your teacher for advise?
A. what to do; to ask B. how to do; to ask C. what to do; ask D. how to do; ask
51. I think he should get a job, but you can’t force him ________ if he’s not ready ________.
A. to get; to B. to get; X C. to; X D; to; to do
52. ― Would you like to go to the ball?
― Yes, ________.
A. I’d B. I’d like C. I’d like to D. I’d like to go
53. ― Aren’t you in charge of this?
― No, and I ________.
A. don’t want B. don’t want to C. don’t want to be D am not
54. ________the truth, I don’t want to go.
A. To tell B. Tell C. Telling D. In order to tell
55. I’d rather read something at home than ________to the park in such weather.
A. go B. to go C. going D. went
56. We could do nothing but ________Father for help.
A. ask B. asking C. to ask D. asked
57. He wanted nothing but ________in the corner.
A. seat B. be seated C. be seat D. to be seated
58. It ________about two years________ such a big dam.
A. takes; in building B. takes; to build C. needs; in building D. needs; to build
59. How much did ________cost ________the house?
A. it; in rebuilding B. he; in rebuilding C. it; to rebuild D. he; to rebuild
60. ________requires patience ________a good nurse.
A. She; to be B. she; if she is C. It; to be D. It; if she is
篇8：高一年级英语语法专项试题
1. Peter ________come with us tonight, but he isn’t very sure yet.
A. must B. can C. may D. will
2. ― Could you borrow your dictionary?
― Yes, of course you ________.
A. might B. will C. can D. should
3. A computer ________think for itself, it must be told what to do.
A. can’t B. couldn’t C. may not D. might not
4. I didn’t hear the phone, I ________asleep.
A. must be B. must have been C. should be D. should have been
5. There was plenty of time, she ________.
A. mustn’t have hurried B. couldn’t have hurried C. must not hurry D. needn’t have hurried
6. The plant is dead. I ________it more water.
A. will give B. would have given C. must give D. should have given
7. Very loud noises ________make people ill, hurt their ears, or even drive them mad.
A. must B. need C. can D. should
8. He asked me for the dictionary many times; please tell him that he ________have it tomorrow.
A. must B. need C. may D. dare
9. ― Why is she still standing there?
― She ________be waiting for her boyfriend.
A. can B. must C. dare D. need
10. Two eyes________ see more than one.
A. can B. must C. might D. shall
11. What ________he mean? ________you tell me?
A. can; May B. can; Can C. may; May D. must; Should
12. How ________he say that his teacher was unfair?
A. must B. might C. could D. need
13. It ________be very cold in this part.
A. can B. ought C. shall D. dare
14. I’d like to ask a question if I ________.
A. must B. will C. may D. might
15. Even in summer the temperature ________suddenly drop below freezing.
A. might B. ought C. must D. need
16. He decided to join the army so that he ________defend the country.
A. may help B. might help C. helps D. helped
17. You ________always be talking like that.
A. mightn’t B. mayn’t C. can’t D. mustn’t
18. The car ________have broke down just when we were about to start off.
A. must B. could C. might D. should
19. You ________see him while he is in hospital.
A. have better B. had better C. would rather D. had to
20. There is a fine sunset; it ________to be a fine day tomorrow.
A. ought B. should C. has to D. has better
21. You are his father, you ________take care of him.
A. might B. ought C. ought to D. are able to
22. That’s all. It ________be talked about any more.
A. needn’t B. mightn’t C. darn’t to D. needn’t to
23. The question ________discussing.
A. needs B. need C. can be D. must be
24. He ________even look out of the window.
A. daren’t B. daresn’t C. dared not to D. dares not
25. I’m so hungry that I ________find something to eat.
A. have to B. would C. may D. can
26. All the students ________do their best for the modernization of our country.
A. can B. should C. may D. might
27. You ________be careful with your homework.
A. must B. have to C. may D. are used to
28. It is getting darker. You ________not go home.
A. had better B. have better C. would rather D. would like
29. I ________what happened to our school.
A. would like know B. would like to know
C. would like knowing D. would like that I know
30. ― Would you mind my changing the plan?
― ________.
A. Oh, no, please B. Yes, I mind not C. No, I would D. Yes, I will
31. ― It ________ be Jack who is in the library.
― I’m sure it ________be him, I saw him off at the railway station just two days ago.
A. can’t; can’t e B. must; mustn’t C. must; can’t D. can’t; mustn’t
32. I ________tell her the truth about his marriage.
A. can’t help B. can’t but C. may not help D. mustn’t but
33. Since she is angry, we ________.
A. had better to leave her along B. should leave her alone
C. would rather to leave her alone D. must leave her alone
34. Look! What you’ve done to me. You ________more careful.
A. maybe B. had to C. should have been D. would be
35. ________read the letter for you?
A. Would you like me B. Do you want me C. Will you mind me D. Shall I
36. He promised he ________not make such silly mistakes.
A. would B. should C. might D. could
37. ________it be true that his father will go abroad?
A. Can B. May C. Need D. Should
38. Those streams are so small that they ________be shown in the maps.
A. mustn’t B. may not C. can’t D. may
39. ― May I use your bike?
― ________.
A. No, you may not B. No, you mustn’t C. No, you won’t D. Sorry, I’m afraid not
40. ― Must I write to her?
― No, you ________.
A. mustn’t B. shouldn’t C. can’t D. don’t have to
41. ― Need I start tonight?
― Yes, you ________.
A. do B. need C. must D. may
42. The old man ________sit for hours watching the ships.
A. would B. should C. was used to D. would rather to
43. If the telephone ________ring, please wake me up.
A. would B. should C. will D. might
44. I wish they ________stop making remarks about me.
A. would B. will C. should D. shall
45. You’re thirsty, aren’t you? ________he get some coffee?
A. Does B. Shall C. Would D. Let
46. Which of the following is wrong?
A. That may be true. B. That might be true. C. That can be true. D. That could be true.
47. ― Would you lend me some money?
― Yes, I ________.
A. would B. will C. can D. may
48. He ________ swimming when he was young.
A. was used to go B. got used to go C. used to going D. used to go
49. You say you ________ not do it, but I say you ________do it.
A. will; shall B. shall; shall C. shall; will D. will; will
50. You ________out yesterday without a coat. No wonder you caught cold.
A. should have gone B. shouldn’t have gone C. could not have gone D. might have gone
51. He ________the 8:30 train because he didn’t leave home until 9:00.
A. can’t catch B. couldn’t catch C. may not D. can’t have caught
52. You ________us this because we had more than enough.
A. needn’t bring B. needn’t have brought C. mustn’t bring D. couldn’t have brought
53. ― He learnt the language in three months.
― He ________very hard.
A. must work B. might have worked C. must have worked D. might work
54. ― Who told you my telephone number?
― I don’t remember. It ________Mary.
― It can’t be Mary, she doesn’t know it.
A. may have been B. can have been C. must be D. can be
55. You ________him, why didn’t you?
A. ought to thank B. ought have thanked C. ought to have thanked D. ought thank
56. I ________have arrived a little earlier, but my car broke down.
A. should B. could C. can D. can’t
57. ― ________we go out for a walk?
― Great. Let’s go
A. Shall B. Will C. May D. Should
58. Though she was seriously ill, she ________ complete the work in time.
A. would B. was able to C. was possible to D. might
59. ― Would you like to play chess with me?
― Yes, ________.
A. I’d B. I would C. I’d like D. I’d like to
60. Tom is late. He ________the wrong bus.
A. must take B. must have taken C. might take D. could take
篇9：高一年级英语语法专项试题
一、
1. _______(I)teacher________(like)________(read)books.
2.Whatdoesthatmando?Heisa________(farm).
3.MrSong________(teach)Music.Heisa________(good)________(teach).
4.Theycan_______(speak)______(China).
5.Howmany__________(library)______(be)thereourschool?
6.Mysister________(like)________(watch)TV.
7.Sometimeshe_____(fly)kites________(and)hisfriends.
8._______(0ne),wefoldthecardanddrawpretty________(thing).
9.Then,ChristmasEve_______(come).Myfriend________(be)veryhappy.
10.Thedoghaslong_______(leg).
11.What_______(do)yourfather_______(do)atweekends.
1.我们总是在圣诞节玩的很开心。
Wealwayshave_________________________________Christmas.
2.本能滑冰吗？不，但他游泳很好。
_______Ben_______?No,buthe______________.
3.迈克在周末通常做什么？他和网友聊天。
What_______Mike____________________________?
He______________withhis_______.
4.汤在哪里？它在牛奶的前面。
____________________________?
__________________________________________.
5.她在周末做什么？她经常看电视。有时候去看电影。
______________she_______at_______?
She_____________________.Sometimesshe_______tothe_______.
三、句型转换。（42分，每题1分,第14题1空2分）
1.Thereisaboatontheriver.(改为否定句）
There_________aboatontheriver.
2.Theyhavebigeyesandsmallears.(划线部分提问)
__________________theyhave?
3.Thosearelegs.(改为否定句)
Those_________legs.
4.Giveitacake.(改为否定句)
__________________itacake.
5.Theyliketheirdogs.(改为一般疑问句)
_________they_________theirdogs?
6.Thereisanappleinthebag.(对划线部分提问)
_____________________________________________inthebag?
7.Sheusuallyhasdancinglessonsatweekends.(对划线部分提问)
__________________she__________________atweekends?
8.Mycousinlikesplayingbasketball.(改为一般疑问句）
__________________cousin_________playingbasketball?
9.HelivesintheUK.(对划线部分提问）
__________________he_________?
10.Hisfatheristhirty-fiveyearsold.(对划线部分提问)
___________________________hisfather?
11.ShecanspeakEnglish.(改为一般疑问句)
_________she_________English?
12.Therearesomefootballsintheplayground.(改为一般疑问句)
___________________________footballsintheplayground?
13.TheboyslikesMathsandPE.(对划线部分提问)
___________________________theboy_________?
14.Theylikesinging.(用she改写)
She__________________
15.Thereisahouseintheforest.(改为复数形式）
There___________________________intheforest.
篇10：高考数学专项练习试题
高考数学专项练习试题
一、选择题
1.若点P是两条异面直线l，m外的任意一点，则( )
A.过点P有且仅有一条直线与l，m都平行
B.过点P有且仅有一条直线与l，m都垂直
C.过点P有且仅有一条直线与l，m都相交
D.过点P有且仅有一条直线与l，m都异面
答案：B 命题立意：本题考查异面直线的几何性质，难度较小.
解题思路：因为点P是两条异面直线l，m外的任意一点，则过点P有且仅有一条直线与l，m都垂直，故选B.
2.如图，P是正方形ABCD外一点，且PA平面ABCD，则平面PAB与平面PBC、平面PAD的位置关系是( )
A.平面PAB与平面PBC、平面PAD都垂直
B.它们两两垂直
C.平面PAB与平面PBC垂直，与平面PAD不垂直
D.平面PAB与平面PBC、平面PAD都不垂直
答案：A 解题思路： DA⊥AB，DAPA，AB∩PA=A，
DA⊥平面PAB，又DA平面PAD，平面PAD平面PAB.同理可证平面PAB平面PBC.把四棱锥P-ABCD放在长方体中，并把平面PBC补全为平面PBCD1，把平面PAD补全为平面PADD1，易知CD1D即为两个平面所成二面角的平面角，CD1D=APB，
CD1D<90°，故平面PAD与平面PBC不垂直.
3.设α，β分别为两个不同的平面，直线lα，则“lβ”是“αβ”成立的( )
A.充分不必要条件
B.必要不充分条件
C.充要条件
D.既不充分也不必要条件
答案：A 命题立意：本题主要考查空间线面、面面位置关系的判定与充分必要条件的判断，意在考查考生的逻辑推理能力.
解题思路：依题意，由lβ，lα可以推出αβ;反过来，由αβ，lα不能推出lβ.因此“lβ”是“αβ”成立的充分不必要条件，故选A.
4.若m，n为两条不重合的直线，α，β为两个不重合的平面，则下列结论正确的是( )
A.若m，n都平行于平面α，则m，n一定不是相交直线
B.若m，n都垂直于平面α，则m，n一定是平行直线
C.已知α，β互相垂直，m，n互相垂直，若mα，则nβ
D.m，n在平面α内的射影互相垂直，则m，n互相垂直
答案：B 解题思路：本题考查了空间中线面的平行及垂直关系.在A中：因为平行于同一平面的两直线可以平行，相交，异面，故A为假命题;在B中：因为垂直于同一平面的两直线平行，故B为真命题;在C中：n可以平行于β，也可以在β内，也可以与β相交，故C为假命题;在D中：m，n也可以不互相垂直，故D为假命题.故选B.
5.如图所示，已知正方体ABCD-A1B1C1D1的棱长为2，长为2的线段MN的一个端点M在棱DD1上运动，另一端点N在正方形ABCD内运动，则MN的中点的轨迹的面积为( )
A.4π B.2π
C.π D.-π
答案：D 解题思路：本题考查了立体几何中的点、线、面之间的关系.如图可知，端点N在正方形ABCD内运动，连接ND，由ND，DM，MN构成一个直角三角形，设P为NM的中点，根据直角三角形斜边上的中线长度为斜边的一半可得，不论MDN如何变化，点P到点D的距离始终等于1.故点P的轨迹是一个以D为中心，半径为1的球的球面，其面积为.
技巧点拨：探求以空间图形为背景的轨迹问题，要善于把立体几何问题转化到平面上，再联合运用平面几何、立体几何、空间向量、解析几何等知识去求解，实现立体几何到解析几何的过渡.
6.如图是一几何体的平面展开图，其中四边形ABCD为正方形，E，F分别为PA，PD的中点，在此几何体中，给出下面四个结论：
直线BE与直线CF是异面直线;直线BE与直线AF是异面直线;直线EF平面PBC;平面BCE平面PAD.
其中正确结论的序号是( )
A.1 B.1
C. 3D.4
答案：B 解题思路：本题考查了立体几何中的点、线、面之间的关系.画出几何体的图形，如图，由题意可知，直线BE与直线CF是异面直线，不正确，因为E，F分别是PA与PD的中点，可知EFAD，所以EFBC，直线BE与直线CF是共面直线;直线BE与直线AF是异面直线，满足异面直线的定义，正确;直线EF平面PBC，由E，F是PA与PD的中点，可知EFAD，所以EFBC，因为EF平面PBC，BC平面PBC，所以判断是正确的;由题中条件不能判定平面BCE平面PAD，故不正确.故选B.
技巧点拨：翻折问题常见的是把三角形、四边形等平面图形翻折起来，然后考查立体几何的常见问题：垂直、角度、距离、应用等问题.此类问题考查学生从二维到三维的升维能力，考查学生空间想象能力.解决该问题时，不仅要知道空间立体几何的有关概念，还要注意到在翻折的过程中哪些量是不变的，哪些量是变化的.
二、填空题
7.如图，四边形ABCD为菱形，四边形CEFB为正方形，平面ABCD平面CEFB，CE=1，AED=30°，则异面直线BC与AE所成角的大小为________.
答案：45° 解题思路：因为BCAD，所以EAD就是异面直线BC与AE所成的角.
因为平面ABCD平面CEFB，且ECCB，
所以EC平面ABCD.
在RtECD中，EC=1，CD=1，故ED==.
在AED中，AED=30°，AD=1，由正弦定理可得=，即sin EAD===.
又因为EAD∈(0°，90°)，所以EAD=45°.
故异面直线BC与AE所成的角为45°.
8.给出命题：
异面直线是指空间中既不平行又不相交的直线;
两异面直线a，b，如果a平行于平面α，那么b不平行于平面α;
两异面直线a，b，如果a平面α，那么b不垂直于平面α;
两异面直线在同一平面内的射影不可能是两条平行直线.
上述命题中，真命题的序号是________.
答案： 解题思路：本题考查了空间几何体中的点、线、面之间的关系.根据异面直线的定义知：异面直线是指空间中既不平行又不相交的直线，故命题为真命题;两条异面直线可以平行于同一个平面，故命题为假命题;若bα，则ab，即a，b共面，这与a，b为异面直线矛盾，故命题为真命题;两条异面直线在同一个平面内的射影可以是：两条平行直线、两条相交直线、一点一直线，故命题为假命题.
9.如果一个棱锥的底面是正多边形，并且顶点在底面的射影是底面的中心，这样的棱锥叫做正棱锥.已知一个正六棱锥的各个顶点都在半径为3的球面上，则该正六棱锥的体积的最大值为________.
答案：16 命题立意：本题以球的内接组合体问题引出，综合考查了棱锥体积公式、利用导数工具处理函数最值的方法，同时也有效地考查了考生的运算求解能力和数学建模能力.
解题思路：设球心到底面的距离为x，则底面边长为，高为x+3，正六棱锥的体积V=_(9-x2)_6(x+3)=(-x3-3x2+9x+27)，其中0≤x<3，则V′=(-3x2-6x+9)=0，令x2+2x-3=0，解得x=1或x=-3(舍)，故Vmax=V(1)=(-1-3+9+27)=16.
10.已知三棱锥P-ABC的各顶点均在一个半径为R的球面上，球心O在AB上，PO平面ABC，=，则三棱锥与球的体积之比为________.
答案： 命题立意：本题主要考查线面垂直、三棱锥与球的体积计算方法，意在考查考生的空间想象能力与基本运算能力.
解题思路：依题意，AB=2R，又=，ACB=90°，因此AC=R，BC=R，三棱锥P-ABC的体积VP-ABC=PO·SABC=_R__R_R=R3.而球的体积V球=R3，因此VP-ABCV球=R3R3=.
三、解答题
11.如图，四边形ABCD与A′ABB′都是正方形，点E是A′A的中点，A′A平面ABCD.
(1)求证：A′C平面BDE;
(2)求证：平面A′AC平面BDE.
解题探究：第一问通过三角形的中位线证明出线线平行，从而证明出线面平行;第二问由A′A与平面ABCD垂直得到线线垂直，再由线线垂直证明出BD与平面A′AC垂直，从而得到平面与平面垂直.
解析：(1)设AC交BD于M，连接ME.
四边形ABCD是正方形，
M为AC的中点.
又 E为A′A的中点，
ME为A′AC的中位线，
ME∥A′C.
又 ME?平面BDE，
A′C?平面BDE，
A′C∥平面BDE.
(2)∵ 四边形ABCD为正方形， BD⊥AC.
∵ A′A⊥平面ABCD，BD平面ABCD，
A′A⊥BD.
又AC∩A′A=A， BD⊥平面A′AC.
BD?平面BDE，
平面A′AC平面BDE.
12.如图，在直四棱柱ABCD-A1B1C1D1中，已知DC=DD1=2AD=2AB，ADDC，ABDC.
(1)求证：D1CAC1;
(2)设E是DC上一点，试确定E的位置，使D1E平面A1BD，并说明理由.
命题立意：本题主要考查空间几何体中的平行与垂直的判定，考查考生的空间想象能力和推理论证能力.通过已知条件中的线线垂直关系和线面垂直的判定证明线面垂直，从而证明线线的垂直关系.并通过线段的长度关系，借助题目中线段的中点和三角形的中位线寻找出线线平行，证明出线面的平行关系.解决本题的关键是学会作图、转化、构造.
解析：(1)在直四棱柱ABCD-A1B1C1D1中，连接C1D， DC=DD1，
四边形DCC1D1是正方形，
DC1⊥D1C.
又ADDC，ADDD1，DC∩DD1=D，
AD⊥平面DCC1D1，
又D1C平面DCC1D1，
AD⊥D1C.
∵ AD?平面ADC1，DC1平面ADC1，
且AD∩DC1=D，
D1C⊥平面ADC1，
又AC1平面ADC1，
D1C⊥AC1.
(1)题图
(2)题图
(2)连接AD1，AE，D1E，设AD1∩A1D=M，BD∩AE=N，连接MN.
平面AD1E∩平面A1BD=MN，
要使D1E平面A1BD，
可使MND1E，又M是AD1的中点，
则N是AE的中点.
又易知ABN≌△EDN，
AB=DE.
即E是DC的中点.
综上所述，当E是DC的中点时，可使D1E平面A1BD.
13.已知直三棱柱ABC-A′B′C′满足BAC=90°，AB=AC=AA′=2，点M，N分别为A′B和B′C′的中点.
(1)证明：MN平面A′ACC′;
(2)求三棱锥C-MNB的体积.
命题立意：本题主要考查空间线面位置关系、三棱锥的体积等基础知识.意在考查考生的空间想象能力、推理论证能力和运算求解能力.
解析：(1)证明：如图，连接AB′，AC′，
四边形ABB′A′为矩形，M为A′B的中点，
AB′与A′B交于点M，且M为AB′的中点，又点N为B′C′的中点.
MN∥AC′.
又MN平面A′ACC′且AC′平面A′ACC′，
MN∥平面A′ACC′.
(2)由图可知VC-MNB=VM-BCN，
BAC=90°， BC==2，
又三棱柱ABC-A′B′C′为直三棱柱，且AA′=4，
S△BCN=_2_4=4.
A′B′=A′C′=2，BAC=90°，点N为B′C′的中点，
A′N⊥B′C′，A′N=.
又BB′⊥平面A′B′C′，
A′N⊥BB′，
A′N⊥平面BCN.
又M为A′B的中点，
M到平面BCN的距离为，
VC-MNB=VM-BCN=_4_=.
14.如图，在四棱锥P-ABCD中，平面PAD⊥平面ABCD，ABDC，PAD是等边三角形，BD=2AD=8，AB=2DC=4.
(1)设M是PC上的一点，证明：平面MBD平面PAD;
(2)求四棱锥P-ABCD的体积.
命题立意：本题主要考查线面垂直的判定定理、面面垂直的判定定理与性质定理以及棱锥的体积的计算等，意在考查考生的逻辑推理能力与计算能力，考查化归与转化思想.
解析：(1)证明：在ABD中，因为AD=4，BD=8，AB=4，所以AD2+BD2=AB2.
故ADBD.
又平面PAD平面ABCD，平面PAD∩平面ABCD=AD，BD平面ABCD，
所以BD平面PAD，
又BD平面MBD，
所以平面MBD平面PAD.
(2)过点P作OPAD交AD于点O，
因为平面PAD平面ABCD，
所以PO平面ABCD.
因此PO为四棱锥P-ABCD的高.
又PAD是边长为4的等边三角形，
所以PO=_4=2.
在四边形ABCD中，ABDC，AB=2DC，
所以四边形ABCD是梯形.
在Rt△ADB中，斜边AB上的高为=，此即为梯形ABCD的高.
所以四边形ABCD的面积S=_=24.
故四棱锥P-ABCD的体积VP-ABCD=_24_2=16.
篇11：小升初英语祈使句专项试题
小升初英语祈使句专项试题
一、选词填空。
1.Please wait for me. ___________walk so fast.2._________quiet, please.
3._________ sit straight.4._________ go shopping now.
5.__________spitting.6.__________ talking, class begins.
7.__________ a good time!8.__________ talk to your mum like that!
二、写出下列祈使句的`反义疑问句
1. Let’s go,____________? 2. Don’t make such noise, _____________?
3. Teacher, let us go out to play,_____________? 4. Let’s go together, ____________?
5. Let each man decide for himself, _____________? 6. Let us go together, _____________?
7. Come and join us, ____________? 8. Don’t fight with others, ___________?
三、翻译下列各句
1.咱们一起玩吧! ______________________________
2.请不要迟到!______________________________
3.回答这个问题. ______________________________
4. 别那么写!______________________________
5.告诉我你的名字! ______________________________
6. 一定要勇敢! _______________________________
7. 来加入我们吧!______________________________
8. 别浪费时间!______________________________
9. 我们周日去游泳吧!______________________________
10. 禁止吸烟!______________________________
篇12： 小升初英语专项模拟试题
小升初英语专项模拟试题
一. 选择填空：从A、B、C、D中，选出一个最佳答案完成句子。(15%)
1. A works in a restaurant.
A. reporter B. waiter C. teacher D. doctor
2. Is there ______ fruit shop near here?Yes, there’s one near here.
A. a B. the C. an D. /
3. Rick usually ______ up at 5:30 on weekdays.?
A. get B. gets? C. got D. getting.
4. My house is ______ the post office and the bank..
A. on B. in C. between D. over
5. --___________? -- Because they are very cute.
A. What is it ? B .Where are they from?
C. Why do you like pandas? D. How do you like pandas?
6. Do you want to ______English with me?
A. ask B. speak C. talk D. say
7. --Is there a bank over there? -- ___________.
A. Yes, there’s B. No, there aren’t
C. Yes, there is D .No, it isn’t
8. CHow is the weather in Harbin? --It’s _________.
A. snow B. snowing C. snows D. to snow
9. Look! Burton is _________ photos of the Eiffel Tower.
A. having B. making C. watching D. taking
10. --_________are the children doing now?
--They’re playing football on the playground.
A. What B. Where C. When D. How
11. CWhere is Tokyo? --I know it’s in _______.
A. France B. Brazil C. Korea D. Japan
12. CIs that Mr. Smith? --Yes, he ______ a beard.
A. is B. has C. takes D.likes
13. CIt’s cold outside. You’d better _______ your gloves.
A. wear B. in C. with D. put on
14. Please _______, because this is a reading room.
A. quiet B. to be quiet C. be quiet D. to quiet
15. Just go straight and ________ left.
A. go B. come C. take D. turn
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