It has been said that the history of humanity is one of the survival of the fittest.

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问题 It has been said that the history of humanity is one of the survival of the fittest.

选项 A、human being
B、humankind
C、protagonists
D、mankind

答案B

解析 human being：人类(可数)；humankind：人类(抽象名词)；protagonist：主人翁；mankind：人，男子。题中humanity意为“人类，人性”(抽象名词)，可知B选项符合题意。

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