单项选择题

Fresh water, as the passage states, originates from ______.

A．the water vapor in the atmosphere
B．lakes and rivers
C．sea water through distillation by solar radiation
D．underground aquifers
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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
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
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