单项选择题

A．The shapes of water droplets.
B．The formation of rain clouds.
C．The characteristics of fog.
D．The spread of air currents.
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单项选择题
The article is about how people in the United States have to travel about 1,500 to 2,500 miles to get the typical dinner plates.
A．Y
B．N
C．NG
单项选择题
A．They are twins.B．They are classmates.C．They are friends.D．They are colleagues.
A．They are twins.
B．They are classmates.
C．They are friends.
D．They are colleagues.
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