The problem of population is mainly man-made. [br] Now, for human beings, eighty

游客2023-09-02 40

问题 The problem of population is mainly man-made. [br] Now, for human beings, eighty, ninety are coming to be recognized as

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答案 a normal age

解析第6段倒数第2句，现在80-90岁的人被称为正常寿命。

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