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18.One way for students to prevent H7N9flu virus is to open the windows of the classroom to allow the air to _______.(  )
A.accumulateB.circulateC.calculateD.accelerate

分析 对于学生预防H7N9禽流感的一种方法是打开教室的窗户,让空气流通.

解答 答案:B,考查动词的辨析,accumulate"积累",circulate"使流通",calculate"计算",accelerate"加速",根据语境是使空气流通,故答案为B.

点评 考查动词的辨析,要区分各个动词的意思,在平时的学习中要对词汇进行积累.

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