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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 ________


  1. A.
    accumulate
  2. B.
    circulate
  3. C.
    illustrate
  4. D.
    accelerate
B
試題分析:句意:對學生而言,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: 考查動詞的用法。
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