Upon their first encountering leaf-cutting ants in South America, the insects seemed to some Europeans to be carrying bits of greenery to shade themselves from the tropical sun--hence the sobriquet "parasol ants.”
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AUpon their first encountering leaf-cutting ants in South America, the insects seemed to some Europeans to be
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BUpon their first encountering leaf-cutting ants in South America, some Europeans thought they were
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COn first encountering leaf-cutting ants in South America, it seemed to some Europeans that the insects were
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DOn first encountering leaf-cutting ants in South America, some Europeans thought the insects were
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EOn their first encounter with leaf-cutting ants in South America, some Europeans thought it was because the insects were
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正确答案: D