问题 选择题

关于运动的合成,下列说法中正确的是(  )

A.两个初速度为零的匀变速直线运动的合运动一定是匀变运动直线运动

B.一个匀加速直线运动与一个匀减速直线运动合运动一定是匀速直线运动

C.两个直线运动的合运动一定是直线运动

D.一个匀变速直线运动与一个匀速直线运动的合运动一定是匀变速曲线运动

答案

A、初速度为零的匀变速直线运动合成,合初速度为零,具有合加速度,则合运动为匀加速直线运动.故A正确.

    B、一个匀加速直线运动与一个匀减速直线运动合运动不一定是直线运动,可能是曲线运动.故B错误.

    C、两个直线运动的合运动不一定是直线运动,比如平抛运动.故C错误.

    D、一个匀变速直线运动与一个匀速直线运动的合运动,不一定是曲线运动,若两个分运动在同一条直线上,合运动仍然是直线运动.故D错误.

故选A.

完形填空

完成句子(共10小题;每小题2分,满分20分)

阅读下面各小题,根据括号内的汉语提示,用句末括号内的英语单词完成句子。

小题1:With ________ and flowers in blossom, every cell in my body is waking up. (approach)

春天来了,花儿开了,我身上的每个细胞都醒了。

小题2:Actually, once _________________________, grammar is not hard to put into use. (take)

其实, 语法一旦理解运用起来并不难。

小题3:________________ occasionally and dive into the woods, and you’ll be certain to find something that you have never seen before, as Bell’s famous saying goes. (beat)

贝尔的名言是: 偶尔离开平路去寻求困境, 你一定会发现从未见过的东西。

小题4:I don’t want_______________any more trouble so I set the simpler exam paper (there)

我不想再有麻烦了,所以这次试卷出的简单点哦。

小题5: The two-year-old missing baby in Changchun was killed by the thief. Mother couldn’t bear ________________ by such a tragedy so that she lost her mind. (strike)

长春两月大的婴儿被小偷致死,母亲受不了这样的打击,精神失常。

小题6:China’s real estate is on the rise in the recent decade. Numerous high rises have been built in___________________ farm fields. (what)

中国的房地产近十年来成上升趋势,原来是农田的地方都建起了大量的高层建筑。

小题7:Lost in Thailand, low-budget comedy, has grossed 12 billion yuan since its debut.  I’m wondering_________________ that has contributed to its success. (it )

《太囧》一部低成本的搞笑片,从放映来票房收入竟高达12亿,我在想到底是什么促使它如此成功。

小题8:Sorry to hear that you’ve failed in the exam. If only you _______________________ the revision earlier.  (set)

听说你考试不及格很难过,你要是早点着手复习就好了。

小题9:I ____________________ that I’ve made it through. But for your help I wouldn’t have done it

多亏你,我终于挺过来了,不是因为你的帮助我做不到的。

小题10:Take it seriously, my dear children. The video monitoring camera is on. Anyone ____________ the exam should be criticized on the bulletin board. (catch)

亲爱的孩子们,认真对待哦! 监控探头开着呢,凡是逮着考试作弊的学生都要通报批评的啊。

单项选择题