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 本题是说一些研究证实这种眼疾在热带国家很普遍。B项“prevalent普遍的，流行的”符合题意，如：The habit of travelling by aircraft is becoming more prevalent each year．(坐飞机旅行一年比一年普遍了)。其他三项“prospective预期的；provocative煽动的；perpetual永久的”都不正确。
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