【題目】--- I can't stand swimming in cold rivers in winter.
-- -But it's ______ for your health. You know I often swim in rivers in different seasons.
A.helpful
B.harmful
C.painful
D.careful

【答案】A
【解析】句意：——我不能忍受在冬天寒冷的河里游泳。——但是對你的健康有幫助。你知道我經(jīng)常在不同的季節(jié)在河里游泳。helpful有幫助的；harmful有害的；painful痛苦的；careful小心的。根據(jù)后一句可知冬天游泳對健康有益，故選A。

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