2. 外语
  3. Some studies confirmed that this kind of eye disease was______in tropic countries.

Some studies confirmed that this kind of eye disease was______in tropic countries.

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问题 Some studies confirmed that this kind of eye disease was______in tropic countries.
选项 A、prospective
B、prevalent
C、provocative
D、perpetual
答案B
解析 B项“prevalent普遍的，流行的”符合题意。其他三项“A项prospective预期的；C项provocative煽动的；D项perpetual永久的”都不正确。本题是说一些研究证实这种眼疾在热带国家很普遍。因此B项为正确答案。
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