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
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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
单项选择题
Every year the continents get back ______.
A．the same amount of water as is lost to evaporation
B．less water than that which is lost to evaporation
C．more water than that which is lost to evaporation
D．different amounts of water based on weather conditions
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