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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．a(chǎn)ccumulate B．circulate C．illustrate D．a(chǎn)ccelerate

B

解析試題分析：句意：對(duì)學(xué)生而言，阻止H7N9流感病毒的一種方法就是打開教室的窗戶，讓空氣流通。Accumulat積累；circulate循環(huán)；illustrate 闡明、圖解；accelerate 加速。
考點(diǎn): 考查動(dòng)詞的用法。

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