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便。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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