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

解析試題分析:考查連詞辨析。A然而;B或者,否則;C因為;D于是;句意:大部分的鯨魚每幾分鐘都需要上浮來呼吸空氣,然而一些鯨魚卻可以在水下一個多小時。根據(jù)句意while表示輕微的轉折。
考點:考查連詞辨析
點評:連詞的詞義辨析要根據(jù)上下文的語境來辨析。要特別注意一詞多義的現(xiàn)象,如while可以表示當…時;然而;盡管;要根據(jù)上下文的語義來進行。

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