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    2．Modern science has found that _______ one is using chopsticks，over 30joints and over 50
    muscles are used，which is a favorable stimulation to the brain．（　　）
    A．sinceB．althoughC．unlessD．while

    分析 现代科学发现，当一个人正在使用筷子时，30多个关节和50多块肌肉被使用，对大脑是个有利的刺激．

    解答 答案：D．此处while one is using the chopsticks为时间状语从句，根据主句可知此处需要"当…时候"的连词，故填while当…时候．A．since自从，B．although尽管，C．unless除非．

    点评 本题考查连词的用法．学生需对主从句之间的关系来选择合适的从属连词．

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