Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
A．whileB．orC．forD．so
A
考查連詞;A. while 當(dāng)…時(shí)候，雖然，然而，B. or否則，C. for因?yàn)椋珼. so 因此，句意是;大多數(shù)鯨魚(yú)幾分鐘后要浮出水面呼吸，但還有些可以在水下呆一個(gè)小時(shí)或更多。選Ａ。
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