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One way for students to prevent H7N9 flu virus is to open the windows of the cla

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One way for students to prevent H7N9 flu virus is to open the windows of the cla

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

试题答案

B

试题

标签：preventfluisvirusway

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