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    The air is so ________ that the smoke is rising straight up．

    [　　]

    A．calm

    B．silent

    C．still

    D．quiet

    答案：C
    解析：

    考查形容词义辨析。句译为：天空无风，所以烟很直。still，形容词，“无风的，静止的”；calm，形容词，“冷静的”；silent，形容词，“沉默的”；quiet，形容词，“安静的”。


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