专四

单选题_________填上最佳答案。

A．change 
B．return
C．adaptation 
D．tendency

参考答案：C进入在线模考
adaptation(to)指“(对……的)适应性”，在文中提及人类作息时间转换的适应性时，用的都是adapt，故选C。
【点睛】词汇线索题。考查句子层面的名词含义。虽然这里四个选项都可以和介词to搭配，但要与句中修饰该名词的过去分词词组built up“逐步建立的”在意义生相搭配，Change,,转变“和return”回转“并不合适。在这里有“由不适应到适应”的含义，因此adaptation'‘适应”最合题意。tendency”倾向’由于缺少“适应”这一含义，也不舍适。

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