According to the text， all of the following behaviors have been exhibited by different populations EXCEPT

　　[A] roughly constant population levels from year to year.

　　[B] regular cycles of increases and decreases in numbers.

　　[C] erratic increases in numbers correlated with the weather.

　　[D] unchecked increases in numbers over many generations.

參考答案：D

　　「解析」這是一道審題定位與中心主旨題。根據本題題干中的“different populations”可將本題的答案信息來源確定在首段的第一句，因為該句中的“all species”實際上指的就是題干中的“different populations”。從第一段的首句入手并且仔細閱讀首段的第二句，就可以找出本題的正確選項D，因為該選項所傳達的信息與原文第一段第一、二句所傳達的信息不一致�？忌�在解題時一定要學會迅速審題定位的能力。

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