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【简答题】
将下列十进制数分别转换为二进制数和十六进制数。 128 625 67.5 24.25
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反馈参考答案：
举一反三
【简答题】A．Because of its good airport facilities. B．Because of its location in the country. C．Because of its size. D．Because of its round-the-clock service.
【简答题】A．Because of its size. B．Because of its fuel. C．Because of its complicated engine. D．Because of its burning time.
【单选题】October 24, _____ was the date when America suffered its first stock market crash in history.
A.
1926
B.
1927
C.
1919
D.
1929
【单选题】Why does the Big Ben enjoy such a reputation?
A.
Because of its location.
B.
Because of its weight and accuracy.
C.
Because of its designers.
D.
Because of the delicate design and its historical significance.
【多选题】所有的遗传漂变的增加都是来自抽样误差,抽样误差的增加来自一下( )方面:
A.
由于有限的空间、食物或其他的关键因素种群经过一些世代缩小很多。经过很多世代的小种群的遗传漂变会很大程度地影响群体基因库的组成。
B.
通过奠基者效应founder effect，由于建群时个体数量很少影响。尽管这样的种群后期会变得很大，但所有成员携带的基因都来自于很少的那些建群者个体的基因（假设没有迁移和突变）随机事件chance event会影响奠基者的哪个基因存在，从而对整个种群的基因组成产生重要影响。
C.
遗传漂变增加是通过遗传瓶颈genetic bottleneck，当一个种群经过剧烈的减小后再发展时。
D.
以上都不是
【简答题】随机遗传漂变(random genetic drift)
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