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  3. The word "caste"(paragraph 1) most probably means That fire ants prey on bollworms and budworms is mentioned to show that

The word "caste"(paragraph 1) most probably means That fire ants prey on bollworms and budworms is mentioned to show that

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问题 The word "caste"(paragraph 1) most probably means
That fire ants prey on bollworms and budworms is mentioned to show that
选项 A、pests often attack each other to maintain a balance of nature.
B、fire ants are not always harmful pests in given situations.
C、fire ants are stronger and fiercer than bollworms and budworms.
D、pests are either harmful or beneficial to people or plants.
答案B
解析 目的细节题。例子永远证明观点。本例子前面的观点是文章第二段开头句：尽管火蚁在某些情况下是害虫，但是在其他条件下也可以是有益的。
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考研英语一

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