In case of fire, stay low to the ground in a smoky room, ________ smoke always rises towards the ceiling.
A．a(chǎn)sB．whenC．whileD．once
A

試題分析： 考察連詞辨析。A因?yàn)�，隨著；C當(dāng)…時(shí)；C當(dāng)…時(shí)；然而；盡管；D一旦；句義：萬(wàn)一遇見了火災(zāi)，在有煙的房間里要彎腰到地面，因?yàn)闊熆偸窍蛏系教旎ò宓摹８鶕?jù)句義說(shuō)明上下文之間有因果關(guān)系，故使用as連接上下文。故A正確。
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