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

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

admin2012-09-10  64
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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