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

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

admin2013-02-05  46
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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