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

The end of the passage implies that the water finally available for mankind to utilize each year ______.

A．is enough to meet all human needs
B．is a little more than enough for all human needs
C．is not adequate for all human needs
D．is adequate now but will not be enough for some years to come