单项选择题

A．On Friday.
B．On Saturday.
C．On Thursday.
D．On Wednesday.
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单项选择题
A．avoid gas when the air coolsB．avoid mist when the air coolsC．avoid rapor when the air coolsD．avoid moisture when the air cools
A．avoid gas when the air cools
B．avoid mist when the air cools
C．avoid rapor when the air cools
D．avoid moisture when the air cools
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