单项选择题

A．The Mechanics of Rain.
B．The Weather Patterns of North America.
C．How Earth’ s Gravity Affects Agriculture.
D．Types of Clouds.
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单项选择题
A．200 times bigger.B．1,000 times bigger.C．100,000 times bigger.D．1,000,000 times bigger.
A．200 times bigger.
B．1,000 times bigger.
C．100,000 times bigger.
D．1,000,000 times bigger.
单项选择题
A．They never occur.B．They are net affected by the force of gravity.C．In still air they would fall to earth.D．In moving air they fall at a speed of thirty-two miles per hour.
A．They never occur.
B．They are net affected by the force of gravity.
C．In still air they would fall to earth.
D．In moving air they fall at a speed of thirty-two miles per hour.
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