I picked up a bag with her name（)on it.

A.She nearly passed out after she heard the news

B.I have distrusted her ever since she cheated me

C.As reading this book, I have picked up more than one hundred printing mistakes

D.She smiles when you praise her

A.having a lot of

B.with many

C.had a lot of

D.with a lot of

A.took

B.looked

C.picked

D.brushed

hen we are working, we leave the bags tied to the wall, out of the way. At bedtime we untie them and take them wherever we’ve chosen to sleep.

On most space shuttle flights everyone sleeps at the same time. No one has to stay awake to watch over the spaceplane; the shuttle’s computers and the engineers at Mission Control do that. If anything goes wrong, the computers ring an alarm and the engineers call us on the radio.

On the space shuttle, sleep-time doesn’t mean nighttime. During each ninety-minute orbit the sun “rises ” and shines through our windows for about fifty minutes; then it “ sets ” as our path takes us around the dark side of the earth. To keep the sun out of our eyes, we wear black sleep masks.

It is surprisingly easy to get comfortable and fall asleep in space. Every astronaut sleeps differently. Some sleep upside down, some right side up. When it’s time to sleep, I take my bag, my sleep mask, and my tape player with earphones and float up to the flight deck. Then I crawl into the bag, and float in a sitting position just above a seat, right next to a window. Before I pull the mask down over my eyes, I relax for a while, listening to music and watching the Earth go by beneath me.

36、When it’s bedtime, astronauts pull their sleeping bags ________ .

A.near the windows

B.in the flight deck

C.above the seats

D.in any place they like

37、“Watch over” in para. 2 has the closest meaning to ________ .

A.take care of

B.see

C.look at

D.pay attention to

38、How long does it take for the space shuttle to go round the Earth？

A.Twenty-four hours

B.Fifty minutes

C.Ninety minutes

D.Nineteen minutes

39、According the passage, in order to get comfortable ａｎｄ fall asleep in space, it is necessary to ________ .

A.wear a sleep mask

B.listen to music

C.sleep upside down

D.sleep sideways

40、The best title for this passage is ________ .

A.bedtime doesn’t mean nighttime

B.sleeping in space

C.orbiting the Sun

D.sleeping on the space shuttle

A.raise

B.increase

C.keep

D.reduce

A.You may ask for help

B.I’ll give you a hand

C.Please do me a favor

D.I’d come to help

A.Could you put your bag on the belt, please？

B.Could you tell me what’s in your bag, please？

C.Would you mind opening your bag？

D.Would you mind putting your metal objects on the tray？

令V是实数域R上一个三维向量空间，σ是V的一个线性变换。它关于V的某一个基的矩阵是

(i)求出σ的最小多项式p(x)，并把p(x)在R[x]内分解为两个最高次项系数是1的不可约多项式p₁(x)与p₂(x)的乘积;

(ii)令W_i={ξ∈V|p_i(σ)ξ=0}，i=1，2。证明，W_i是σ的不变子空间，并且V=W₁⊕W₂;

(iii)在每一子空间W_i中选取一个基，凑成V的一个基，使得σ关于这个基的矩阵里只出现三个非零元素。

设V足一个线性空间。证明不存在V的子空间W₁,W₂.W₃.W₄.W₅同时满足下面四个条件

1}i≠j时，Wi≠Wj;

2)仍在这五个子空间之中:

3)

4)W2与W4，W3与W4之间无包含关系，

Don't Take the Fun Out of Youth SportsWhen I joined a private football league a few

Don't Take the Fun Out of Youth Sports

When I joined a private football league a few years ago，the sport meant everything to me. My coach said that I had lots of potential，and I became captain of my 36. That was before all the fun was taken out of 37 .At first，everyone on the team got 38playing time. Then the team moved up to the top division after winning all its games，and the 39 started. Some parents，who had paid the coach extra money so their daughters could have 40 one-on-one training，got angry when she didn't give them more playing time in our 41 . The coach was replaced.The new coach，however，took all the fun out of the game：All we did during practice was 42 . I always wished to God that it would rain so we would not have the 43 .Of course，all teams run drills;they are 44 . But we ran so much that，afterwards，we had trouble 45 . Younger people shouldn't be doing exercises 46 for 18-year-olds.I was very thin 47 I started football，but as a member of this team I wouldn't eat much，because I was afraid of being too 48 to run. I feared making mistakes，and the added pressure caused me to make more than my usual 49 .Is all this pressure necessary ？I 50up leaving the football team. Four other girls did the same，and two of them stopped playing football completely. That's 51 ，because they had so much potential. They were just burned-out with all the pressure they 52from the coach or their parents.I continued playing football at school and 53my love for it. I joined a private team coached by my school coach. When I started playing 54 him，he told me I needed to relax because I looked nervous. After I 55 down，I played better. When you enjoy something，it's a lot easier to do it well.

36 A. class B. club C. team D. board

37 A. playing B. living C. learning D. working

38 A. great B. equal C. right D. extra

39 A. business B. struggle C. attempt D. pressure

40 A. free B. private C. good D. basic

41 A. matches B. courses C. lessons D. programs

42 A. jump B. play C. run D. shoot

43 A. duty B. meeting C. operation D. training

44 A. necessary B. boring C. scientific D. practical

45 A. speaking B. moving C. sleeping D. breathing

46 A. used B. intended C. made D. described

47 A. till B. since C. before D. because

48 A. full B. tired C. lazy D. big

49 A. size B. share C. space D. state

50 A. gave B. kept C. ended D. picked

51 A. loud B. fast C. publicly D. calmly

52 A. People B. Nobody C. Somebody D. I

53 A. shock B. wonder C. worry D. pleasure

54 A. if B. for C. while D. although

55 A. excited B. satisfied C. think D. laugh