The word "caste"(paragraph 1) most probably means Whether fire ants are pests or not largely depends on their

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问题 The word "caste"(paragraph 1) most probably means
Whether fire ants are pests or not largely depends on their

选项 A、predatory activities.
B、temporal distribution.
C、spreading speed.
D、geographical distribution.

答案D

解析 原因细节题。文章第三段开头句说:火蚁是否是害虫就看在哪里找到它们,这就是它们的地理分布。
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