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

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

选项

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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