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        1. 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)椋S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。根?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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