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【题目】Strong __________ can be very dangerous for swimmers.

A. flows B. columns

C. floods D. currents

【答案】D

【解析】句意:强大的水流对游泳者是非常危险的。flow(液体的)流动,流淌;column柱状物,专栏;flood洪水;current洋流,水流,气流。

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