In case of fire, stay low to the ground in a smoky room, smoke always rises towards the ceiling.A．asB．whenC．whileD．once 题目和参考答案——青夏教育精英家教网—

题目内容

In case of fire, stay low to the ground in a smoky room, ________ smoke always rises towards the ceiling.

A．as

B．when

C．while

D．once

试题分析：考察连词辨析。A因为，随着；C当…时；C当…时；然而；尽管；D一旦；句义：万一遇见了火灾，在有烟的房间里要弯腰到地面，因为烟总是向上到天花板的。根据句义说明上下文之间有因果关系，故使用as连接上下文。故A正确。

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