如(a)图表示光滑平台上,物体A以初速度v0滑到上表面粗糙的水平小车上,车与水平

题型:选择题

问题:

如(a)图表示光滑平台上,物体A以初速度v0滑到上表面粗糙的水平小车上,车与水平面间的动摩擦因数不计,(b)图为物体A与小车的v-t图像,由此可求出(    )

A.小车上表面最小的长度

B.物体A与小车B的质量之比

C.A与小车上B上表面的动摩擦因数

D.小车B获得的动能

考点:v-t图像
题型:选择题

修路队要修一段公路.第一天修了全长的下的%,第二天修了大0米,这时已修的和未修的长度比是3:下,这段公路有多长?

题型:选择题

绝缘物除击穿被破坏外还有腐蚀性气体()也都会降低其绝缘性能或导致破坏。

A、蒸气

B、潮气

C、粉尘

D、机械损伤

题型:选择题

第二节:完形填空(共15小题;每小题1分,满分15分)

阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。

Twenty years ago, I drove a taxi for a living. One early morning, I received a call for a taxi. When I arrived at the building, it was 2:30 am and only one room gave off light. Many   31  

would just shout once or twice and then drive away. But I thought this passenger might need my

32  . So I walked to the door and   33  . “Just a minute,” answered a weak, elderly   34  . After a long time, the door opened. A small old woman   35  before me, carrying a small suitcase. I took her suitcase and we walked slowly to the car. She kept thanking me for my kindness.

When we got in the car, she gave me a (n)   36  , and then asked to drive through the city center. But it wasn’t the   37  way. “Oh, I’m in no hurry,” she said. “I’m on my way to Westhill Old People’s Home. The doctor says I don’t have much time   38  .

We drove through the city center. She   39  me the building where she once worked. We drove past the church where she got married. Sometimes she’d ask me to slow down in front of a building or at a corner and   40  sit looking at the darkness, saying nothing. When the sun began to   41 , we drove in silence to the old people’s home. When we arrived, almost   42  a second thought, I gave her a big hug (拥抱). “You gave an old woman a little moment of   43 . Thank you!” she said tearfully.

I was totally lost in thought for the rest of the day. I can’t imagine what would happen if I   44  

to do what I did? We always think that there are no great moments in our lives, but great moments are just in what others may consider a   45  one.

31. A. drivers  B. workers      C. guests D. passengers

32. A. advice  B. help    C. suggestion  D. attention

33. A. stopped B. breathed     C. worked      D. knocked

34. A. sound   B. noise   C. voice  D. shout

35. A. turned up     B. set up  C. got up D. put up

36. A. order    B. address       C. idea    D. reason

37. A. busiest  B. longest       C. narrowest   D. shortest

38. A. left       B. saved  C. lost     D. spared

39. A. gave     B. passed C. showed      D. made

40. A. could    B. would C. should D. must

41. A. move    B. set      C. rise     D. burn

42. A. after     B. with    C. except D. without

43. A. patience       B. courage      C. joy     D. sadness

44. A. refused B. offered       C. planned      D. regretted

45. A. difficult       B. small  C. strange       D. interesting

题型:选择题

我市在街头设立了自来水洗手处。一日,自来水哗哗地流着,一位小朋友拨开旁观者踮起脚,伸出小手拧紧水龙头……上述情景给你的感受是[ ]

①市民的环保意识都很强

②环保行动要从我做起

③环境保护需要全民参与、人人动手

④环保行动应从现在做起,从小事做起

A.①②③

B.①②④

C.②③④

D.①②③④

题型:选择题

PowerPoint 2000中,对幻灯片色彩进行调整时,不能进行()幻灯片配色方案操作。

A.添加

B.更改

C.剪切

D.删除

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