2. 外语
  3. Some studies confirmed that this kind of eye disease was ______ in tropical countries.

Some studies confirmed that this kind of eye disease was ______ in tropical countries.

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问题 Some studies confirmed that this kind of eye disease was ______ in tropical countries.
选项 A、prospective
B、prevalent
C、provocative
D、perpetual
答案B
解析 prevalent普遍的，流行的；prospective未来的；盼望中的；provocative使人生气的；煽动的；挑衅的； perpetual永久的。句意：一些研究证实这种眼病在热带国家很普遍。
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