Water vapor in the atmosphere is the channel through which the whole water
circulation (循环) of the biosphere has to pass. Water evaporated (蒸发) from the surface of the oceans, from lakes and rivers and from moist (潮湿的) earth is added to it. From it the water comes out again as rain or snow, falling on either the sea or the land. There is, as might be expected, a more intensive evaporation per unit area over the sea and oceans than over the land, but there is more rainfall over the land than over the oceans, and the balance is restored by the runoff from the land in the form of rivers.
31 Liquid water only exists
A in the center of the earth.
B on the surface of our planet.
C in a very narrow range of temperatures.
D in the coastal areas of the earth.
32 The total quantity of water on Earth
A remains almost unchanged.
B has greatly increased in recent years.
C is decreasing constantly.
D is affected by global warming.
33 Most of the fresh water on Earth
A is stored underground.
B is in the form of ice at the Poles and on mountains.
C is found in rivers and lakes.
D comes from the rain.
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