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
One of the most promising methods of storing hydrogen fuel is ______.
A．in gas form
B．putting it in liquid
C．preserving it in tanks
D．in the form of metal hydrides
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 neede
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