问题
单项选择题
关于优生学，以下哪项错误（）
A.是用遗传学的原理和方法研究如何改善人类遗传素质的学科
B.根据采取的改进遗传素质的策略不同，分为演进性优生学和预防性优生学两类
C.演进性优生学着眼于研究如何增加人群中产生有利表型的等位基因频率
D.预防性优生学着眼于研究如何降低人群中产生不利表型的等位基因频率
E.以上都不对
答案
参考答案：E
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关于优生学，以下哪项错误（）
A.是用遗传学的原理和方法研究如何改善人类遗传素质的学科
B.根据采取的改进遗传素质的策略不同，分为演进性优生学和预防性优生学两类
C.演进性优生学着眼于研究如何增加人群中产生有利表型的等位基因频率
D.预防性优生学着眼于研究如何降低人群中产生不利表型的等位基因频率
E.以上都不对
参考答案：E
I work in a small shop. It’s next ________ an English school . Every day students come to____ things. I _______at six o’clock in the morning . And then I have breakfast at home . I get to (到达) the _____ at about six fifty. The shop opens at seven. We sell （卖）food and drink. We sell school things, _____ . They are all very nice , but they are not ______ .So _______ people often come to _______ shop from morning to evening. I have _______ in the shop at half past twelve . At seven in the evening the shop is closed. We go home _______dinner .
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