问题 多选题

某物体运动的速度图象如图,根据图象可知(  )

A.0~5s内的位移为10m

B.0~2s内的加速度为1m/s2

C.第1s末与第3s末的速度方向相同

D.第1s内与第5s内的加速度方向相同

答案

A、0-5s内的位移为:x=

1
2
×(2+5)×2m=7m,故A错误;

B、在0-2s内的加速度为:a1=

△v
△t
=
2-0
2
m/s2=1m/s2,在4-5s内,加速度为:a2=
-2
1
m/s2=-2m/s2.知第1s末与第5s末加速度的方向相反.故B正确,D错误.

C、第1s末与第3s末的速度都为正值,速度方向相同.故C正确.

故选:BC.

完形填空

第一节:完成句子(共10小题;每小题2分,满分20分)

小题1: When I opened the door, l found him sitting in the sofa, completely _____________________ reading a novel. (absorb)

当我打开门时,我发现他坐在沙发上,完全专心地看小说。

小题2:So _____________________________ that Maric was able to set up new branches elsewhere. (successful)

她的生意是如此成功,以至于玛里克可以在别的地方建立新的分公司。

小题3:It seems that we have to accept the result and make a good preparation to have another try.

                      earlier, I could have done something to avoid this accident. (inform)

看来我们必须接受这个结果并做好再次尝试的准备了。要是我早点得知的话,就可以做些什么来避免这场事故了。

小题4:It is the test system, rather than the teachers,                            for the students’ heavy study burden nowadays. (blame) 

对于学生现在的学业重压,该受责备的是考试体系,而不是老师。

小题5: Have you ever had a case                      but nobody showed any concern? (fall)

你有没有过这种情况,你病倒了,却没有人关心?

小题6:With my money                     , I have to draw some from the bank in case I have none in hand. (run)

我的钱快用完了,所以我要从银行取点钱,以防手头太紧。

小题7:We are told from the director’s office that                           we know the result of the final examination.  (long)

我们从主任办公室获悉,过不了多久,我们就可以知道期终考试的结果。

小题8:Some experts recommend signs and posters be put up in areas                 . (allow)

一些专家建议应在不允许抽烟的地方贴上标志和海报。

小题9: No one really knows exactly when the first people arrived in                 now. (call)

没有人知道确切在什么时候第一批移民者到达我们今天称之为美国的地方。

小题10:A reporter begins by contacting people ______________ and then prepares questions. (interview)

记者要先和被采访人联系,然后准备好要采访的问题。

单项选择题 A1型题