单项选择题

What makes rain fall

A．Air currents' movement.
B．The earth gravity.
C．Droplets' movement
D．The size of the droplets
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单项选择题
What is not mentioned in the passage
A．Rain does not fall from all the clouds.
B．The effect of the gravity on droplets is minute.
C．The average raindrop contains much more water than a tiny cloud droplets.
D．The shape of the clouds have a great influence on the raindrop.
单项选择题
What is the main topic of the passage
A．The mechanics of rain.
B．The climate of North America.
C．How gravity affects air current.
D．Types of clouds.
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