The air is so______ that the smoke is rising straight up.

A.calm                 B.silent

C.still                           D.quiet

C


解析:

考查意義相近的形容詞辨析。still表示沒有動作，silent強調(diào) 聲音， calm 表示內(nèi)心平靜、鎮(zhèn)靜，quiet強調(diào)周圍環(huán)境的安靜。

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