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【单选题】
-----I bought this dictionary two weeks ago. ----You mean you __________ it for half a month.A.
have kept
B.
have had
C.
have bought
D.
have taken
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【单选题】Why are Children raised in a home where physical or ual abuse is taking place at a higher risk for developing an eating disorder?
A.
They may try to regain a sense of self-control in the way of controlling their food intake or their weight.
B.
They are actually very hungry during the abuse so they have to eat a lot when they are free.
C.
They are not allowed to express their emotions in family of this kind.
D.
They are forced to eat a lot by their parents in this kind of families.
【单选题】人们很早就知道，某些生物的活动是按时间的变化来进行的，具有时间上的周期性节律。如鸡叫三遍天亮，青蛙冬眠春晓，大雁春来秋往等等，人们由此作出概括:凡生物的活动都受生物钟支配，具有时间上的周期性节律。与以上论证方法不同的有()。
A.
麻雀会飞，乌鸦会飞，大雁会飞，所以，所有的鸟都会飞。
B.
在我们班，你不会讲德语，我不会讲德语，李阳不会讲德语，汪峰不会讲德语，所以，我们班没人会讲德语。
C.
外科医生在做手术时可以看X光片，律师在为被告辩护时可以看辩护词，教师备课可以看各种参考书，为什么不允许学生考试时看教材或其他资料呢?
D.
在我们班，你不会讲德语，我不会讲德语，李阳不会讲德语，汪峰不会讲德语，所以，我们班没人会讲德语。
【单选题】Why do the cheerleaders sometimes suffer physical injuries?
A.
Because they try erous acts to catch people's attention.
B.
Because they shout and yell so their voice becomes hoarse.
C.
Because they go to the pyramid and the hills to perform.
D.
Because they dance too much every day for practice.
【简答题】What is a physical data model？Why learn physical data model concepts？
【单选题】在推导卢瑟福散射公式时,用了一系列的假设条件,使物理模型更加简化。下列哪个假设是错误的?
A.
原子核不动。通常，散射原子的质量远远大于被散射粒子质量。
B.
忽略电子的作用。由于电子质量太小。
C.
大角散射是多次散射结果。
D.
入射粒子和原子核看成点电荷。
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