问题 填空题

在做“探究小车速度随时间变化规律”的实验时,打点计时器应接在低压交流电源上,如图是某次实验的纸带,舍去前面比较密的点,从0点开始,每两个连续的记数点间有四个打出的点未标出,相邻两计数点之间的时间间隔T=0.1s,各记数点与0记数点之间的距离一次为S1=3.0cm,S2=7.5cm,S3=13.5cm,则打点记数器打记数点1时的物体速度的表达式为v1=______,代入数据求得v1=______m/s.

答案

根据匀变速直线运动中中间时刻的速度等于该过程中的平均速度

所以:v1=

x02
t02
=
s2
2T

解得:v1=0.375m/s

故答案为:

s2
2T
,0.375

完形填空

完型填空(共20小题;每小题1.5分,满分30分)

阅读下面短文,掌握其大意,从每题所给的A、B、C、D四个选项中,选出最佳选项。

Some years ago when I was in my first year in college, I heard Salome Bey sing for the first time. The moment was exciting. Salome’s   36 filled the room and brought the theater to life. I was so   37  that I decided to write an article about her.

I   38  Salome Bey, telling her I was from Essence magazine, and that I wanted to meet her to talk her career. She   39  and told me to come to her studio next Tuesday. When I hung up, I was scared out of my mind. I   40  I was lying. I was not a writer at all and hadn’t even written a grocery list.

I interviewed Salome Bey the next Tuesday. I sat there   41 , taking notes and asking questions that all began with, “Can you tell me…” I soon realized that   42  Salome Bey was one thing, but writing a story for a national magazine was just impossible. The   43  was almost unbearable. I struggled for days   44  draft after draft. Finally I put my manuscript (手稿) into a large envelope and dropped it into a mailbox.

It didn’t take long. My manuscript   45 . How stupid of me! I thought. How could I   46  in a world of professional writers? Knowing I couldn’t   47  the rejection letter, I threw the unopened envelope into a drawer.

Five years later, I was moving to California. While   48  my apartment, I came across the unopened envelope. This time I opened it and read the editor’s letter in   49 :

Dear Ms Profit,

Your story on Salome Bey is fantastic. Yet we need some   50  materials. Please add those and return the article immediately. We would like to   51  your story soon.

Shocked, it took me a long time to   52 . Fear of rejection cost me dearly. I lost at least five hundred dollars and having my article appear in a major magazine. More importantly, I lost years of   53  writing. Today, I have become a full – time writer. Looking back on this   54 , I learned a very important lesson: You can’t   55  to doubt yourself.

36.A.joy                     B.voice                  C.speech                 D.smile

37.A.proud                 B.active                  C.satisfied              D.moved

38.A.visited                B.emailed               C.phoned                D.interviewed

39.A.agreed                B.refused                C.hesitated              D.paused

40.A.replied                B.discovered           C.explained            D.knew

41.A.seriously             B.patiently              C.nervously            D.quietly

42.A.blaming              B.fooling                C.inviting               D.urging

43.A.hardship              B.failure                 C.comment             D.pressure

44.A.with                   B.by                      C.on                      D.in

45.A.disappeared         B.returned              C.spread                 D.improved

46.A.compare              B.struggle               C.survive                D.compete

47.A.ignore                 B.deliver                C.face                    D.receive

48.A.decorating           B.repairing             C.cleaning              D.leaving

49.A.disbelief              B.anxiety                C.horror                 D.trouble

50.A.subjective            B.relevant               C.private                D.reliable

51.A.broadcast            B.create                  C.publish                D.assess

52.A.recover               B.prepare               C.escape                 D.concentrate

53.A.energetic             B.endless                C.typical                D.enjoyable

54.A.experience           B.success                C.benefit                D.accident

55.A.attempt               B.afford                 C.expect                 D.pretend

问答题