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

A. flows B. columns

C. floods D. currents

【答案】D

【解析】句意：強(qiáng)大的水流對(duì)游泳者是非常危險(xiǎn)的。flow（液體的）流動(dòng)，流淌；column柱狀物，專欄；flood洪水；current洋流，水流，氣流。

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