单项选择题

A．The shape of the dust particles in the air.
B．The relative humidity.
C．The temperature of the air.
D．The geography of the area.
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单项选择题
A．The water was too cold. B．The water was too deep. C．She doesn’t know how to swim. D．She didn’t have enough time.
A．The water was too cold.
B．The water was too deep.
C．She doesn’t know how to swim.
D．She didn’t have enough time.
单项选择题
A．Start writing at once. B．Ask for his friend’s suggestions. C．Come up with another idea. D．Get the professor’s approval.
A．Start writing at once.
B．Ask for his friend’s suggestions.
C．Come up with another idea.
D．Get the professor’s approval.
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