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    One way for students to prevent H7N9 flu virus is to open the windows of the classroom to allow the air to ________.

    A．accumulate B．circulate C．illustrate D．accelerate

    B

    解析试题分析：句意：对学生而言，阻止H7N9流感病毒的一种方法就是打开教室的窗户，让空气流通。Accumulat积累；circulate循环；illustrate 阐明、图解；accelerate 加速。
    考点: 考查动词的用法。

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