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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.
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.
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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