OnewayforstudentstopreventH7N9

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更新 2022-09-03
科目英语
题型单选题
难度中等
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挑错有奖

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

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