Most whales must come up for air after s...

Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.

A．while

B．or

C．for

D．so

A 【解析】试题分析：考查连词辨析。A当…时；然而；尽管；B否则，或者；C为了，因为；D于是；句意：大部分的鲸鱼几分钟以后一定要出来换气，然而有一些可以在水下待一个小时或者更长的时间。根据句意说明A正确。考点：考查连词辨析

考点分析：

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