cycling is a fantastic way to burn a few calories and save some money, there still exist risks．
A．SinceB．WhileC．AsD．When
B

試題分析：此處Since 自從；While 盡管；As因為；When當(dāng)……的時候。句意：盡管騎自行車是燃燒熱量的奇妙的方法，但也存在風(fēng)險。根據(jù)句意選B。
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