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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单项选择题
What can be inferred about drops of water larger than 1 125 inch in diameter
A．They never occur.
B．They are not affected by the force of gravity.
C．They would fall to earth.
D．In moving air they fall at a speed of thirty-two miles per hour.
单项选择题
The word loath (line. 11) means ______
A．disgust
B．swear
C．debt
D．burden
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