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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A．As a French translator while stationed in Paris.B．While serving in the army.C．As a dramatist in the American theater.D．His college lif
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A．Peter’s mother is coming for dinner.B．Peter will be unable to come.C．Peter doesn’t like to come.D．Peter is visiting his mother.
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