单项选择题

The word "precipitation" (Line 6, Para. 2) probably means ______.

A．the evaporation of water from the land
B．the water reserves on land
C．the unevenly-distributed rain and snow falls
D．water falling in the form of rain and snow

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单项选择题

A．fictionB．poetryC．essayD．art

A．fiction
B．poetry
C．essay
D．art

单项选择题

Of all the reserves of fresh water in the world, about three-fourths is ______.

A．consumed by glaciers and polar ice
B．in solid form
C．out of the reach of present technology
D．converted into sea water annually