单项选择题

A．The quality of air.
B．The number of trees.
C．The lifecycle of trees.
D．The intensity of solar burning.
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单项选择题
A．In a house.B．In a hotel.C．In a two-bedroom apartment.D．In a three-bedroom apartment.
A．In a house.
B．In a hotel.
C．In a two-bedroom apartment.
D．In a three-bedroom apartment.
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quality
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