单项选择题

A．Why fog freezes at low temperatures.
B．How very small droplets can form.
C．Why the density of fog varies.
D．How water droplets stay suspended in air.
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单项选择题
A．At least three.B．Four.C．Only two foreign languages.D．At least two.
A．At least three.
B．Four.
C．Only two foreign languages.
D．At least two.
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