27.The president was on a tight ______ so he didn’t visit the Forbiddern City entirely.
A.budget B.program C.schedule D.deadline
26.-Mum, where is my lunch pack?
-Just _____ it was.
A.as B.how C.what D.where
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
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
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
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
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
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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