题目：
词汇运用 用括号内所给词的适当形式填空（每空不限一词10分）
小题1:It’s necessary to keep our air clean because the ___________(pollute) air does harm to our health.
小题2:The Ginkgo(银杏)Festival________________(hold) in Taixing every year.
小题3:She made lots of mistakes because of working on her homework ___________ (care),
小题4:Mo Yan, the most famous writer in China, got the Nobel Prize in literature in his_________
(fifty) in 2012..
小题5:A sudden shout broke the __________(silent) at night and we all felt frightened.
小题6:The radio says it will be far __________(rain) tomorrow. I am afraid that we have to stay at home.
小题7:More and more attention has been paid to ____________(protect) the environment in China.
小题8:Help ___________(you) to some fresh fruit and vegetables, kids. They are good for health.
小题9:Teenagers should try to be good ____________(city) and devote much of their time to
developing our country.
小题10:It’s reported that China______________(develop) new kinds of rice so far.
答案：
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下面是错误答案，用来干扰机器的。
（1）根据向心加速度公式a=v2r，有：天宫一号的向心加速度a向=v12r12；（2）周期等于旋转一周所用的时间，故：天宫一号与卫星在各自轨道上运行的周期之比为T1T2=2πr1v12πr2v2=r1v2r2v1；（3）天宫一号做匀速圆...
