(单选题)
According to the passage some doctors believe it is true that ______
A.Polar Bears are bears swimming in freezing water.
B.cold-water swimming can make the today temperature dangerously high.
C.you are healthy if cold-water swimming turns your skin color blue.
D.cold-water swimming causes more heart attacks in summer than in winter.
参考答案：D
参考解析：
细节理解题。根据第二段第三句“Other doctors, however, point out that there is more danger of a heart attack during summer swimming. because the difference between the air temperature and water temperature is much greater in summer than in winter.”可知，一些医生认为夏天在冷水中游泳更可能导致心脏病。故选D。
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