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27.The president was on a tight ______ so he didn’t visit the Forbiddern City entirely.

     A.budget     B.program          C.schedule        D.deadline

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26.-Mum, where is my lunch pack?

     -Just _____ it was.     

     A.as                B.how         C.what             D.where

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25.-How much did the guy _____ you to fix your 3G mobile phone?

      - Idon't remember, but it was quite a lot.

     A.cost              B.spend            C.charge            D.take

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24.My father insisted that every minute   made full use of     the work well.

     A.be, to do                               B.has been, doing 

     C.be, doing                         D.has been, to do

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23.Do come here on Monday,______ we, as planned, will take part in the gathering of AIDS prevention volunteers.

     A.then              B.and               C.therefore         D.or

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22.It's said that within five years cars will be a lot    in our country.

     A.cheaper          B.cheapest        C.cheap           D.more cheap

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第一节:语法和词汇知识(共l5小题;每小题l分,满分l5分)

从A、B、C、D四个选项中,选出可以填人空白处的最佳选项,并在答题卡上将该项涂黑。

例:Mr. Smith owns   collection of coins than anyone else I have ever met.

     A.larger            B.a larger           C.the larger         D.a large

答案是B。

21.The driver was at ______ loss when    word came that he was forbidden to drive after drinking alcohol.

     A.a; the             B.不填; 不填     C.the; the           D.a; 不填

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38.(8分)[物理--物理3-5]

     静止的锂核(Li)俘获一个速度为7.7×106m/s的中子,发生核反应后若只产生两个新粒子,其中一个粒子为氦核(He),它的速度大小是8.0×106m/s,方向与反应前的中子速度方向相同。

  (1)写出此核反应的方程式;

  (2)求反应后产生的另一个粒子的速度大小及方向。

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同步练习册答案