单项选择题

A．9 each year.
B．24 each year.
C．12 each semester.
D．9 each semester.
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单项选择题
A．In a car.B．In a police office.C．In a restarant.D．In a railway station.
A．In a car.
B．In a police office.
C．In a restarant.
D．In a railway station.
填空题
What are the two factors that lead to tropical trees cooling down the land
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