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(jù)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?yàn)樵摼渲械?ldquo;all species”實(shí)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(xì)閱讀首段的第二句，就可以找出本題的正確選項(xiàng)D，因?yàn)樵撨x項(xiàng)所傳達(dá)的信息與原文第一段第一、二句所傳達(dá)的信息不一致�？忌�在解題時(shí)一定要學(xué)會(huì)迅速審題定位的能力。

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