问题
选择题
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
答案
答案：D
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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
答案：D