单项选择题

What is one thing the members of the co - up must do

A．Avoid junk food.
B．Attend monthly meetings.
C．Buy cleaning supplies at the co - up.
D．Work at the co - up.
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单项选择题
Air pollution causes airplane accidents because ______.
A．pilots become iii
B．visibility is reduced
C．engines fail.
D．the air is too hot
单项选择题
According to the passage, what is one disadvantage of skyscrapers that have mirrored walls
A．The exterior surrounding air is heated.
B．The windows must be cleaned daily.
C．Construction time is increased.
D．Extra air-conditioning equipment is needed.
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