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April B0Professor Wang, I am sorry for failing to turn u......

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单项选择题
One benefit the author mentions is that the system______.
A．uses no electricity
B．has a fire-safety shutoff
C．does not pollute the air in the house
D．pollute the air in house
单项选择题
A．inB．withC．onD．for
A．in
B．with
C．on
D．for
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