People should open the window in the morning to make air ________ in order to keep the indoor air fr

题目简介

People should open the window in the morning to make air ________ in order to keep the indoor air fr

题目详情

People should open the window in the morning to make air ________ in order to keep the indoor
air fresh.
[      ]
A. spread  
B. remove
C. float  
D. circulate
题型:单选题难度:中档来源:湖北省同步题

答案

D

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