Water will evaporate from any wetted surface. A
.significantly large fraction of the rainfall that falls on land is returned to
the atmosphere in this fashion. In addition water is assimilated by root systems
of growing plants and is later transpired from the leaf surfaces by a process
essentially identical to evaporation. The two effects, evaporation and
transpiration, cannot be individually discriminated for their effectiveness in
returning rainfall to the atmosphere, but their sum contribution can be
evaluated and is usually called the evapotranspiration factor. The fraction of
rain falling on the United States that is returned to the atmosphere by
evapotranspiration, for example, is 70 percent; for the world as a whole,
approximately 62 percent. In arid countries such as Australia the fraction is
larger, and in less arid areas such as the United Kingdom i
A. the evaporated and transpired water from the earth itself
B. the wet atmosphere above in the sky
C. returning rainfall to the atmosphere
D. the mixture of wet and dry air
更多"Water will evaporate from any wette"的相关试题:
[单项选择]
Water will evaporate from any wetted surface. A
.significantly large fraction of the rainfall that falls on land is returned to
the atmosphere in this fashion. In addition water is assimilated by root systems
of growing plants and is later transpired from the leaf surfaces by a process
essentially identical to evaporation. The two effects, evaporation and
transpiration, cannot be individually discriminated for their effectiveness in
returning rainfall to the atmosphere, but their sum contribution can be
evaluated and is usually called the evapotranspiration factor. The fraction of
rain falling on the United States that is returned to the atmosphere by
evapotranspiration, for example, is 70 percent; for the world as a whole,
approximately 62 percent. In arid countries such as Australia the fraction is
larger, and in less arid areas such as the United Kingdom i
A. stream flow will appear
B. the surplus of water will run off
C. flood will be generated
D. the plant has to transpire the surplus
[填空题]The volcanic activities involve no water in any form because the temperature is so high.
[单项选择]
Water
From the beginning, water has furnished man with a source of food and a highway to travel upon. The first (51) arose where water was a dominant element in the environment, a challenge to man’s ingenuity. The Egyptians invented the 365-day calendar (52) the Nile’s annual flooding. The Babylonians, who were among the most famous law-makers in ancient times, invented laws (53) water usage. Water inspired the Chinese to build a 1,000- (54) canal, a complex system which, after nearly 2,500 years, remains still practically (55) and still commands the astonishment of engineers. But the (56) never found complete solutions to their water problems. The Yellow River is also known (57) "China’s Sorrow"; it is so unpredictable and dangerous (58) in a single flood it may cause a million (59) . Floods slowed the great civilization of the Indus River Valley, and inadequate drainage rui
A. governments
B. cultures
C. civilizations
D. universities
[单项选择]Americans use more water than any other people in the world. If we continue to use water at the rate we do now, we will soon not have enough to meet our needs. In 1980, 40 billion gallons were used each day in the United States. In 1990, 700 billion gallons were used. The average Americans uses almost 90 gallons of water a day for personal use. And much move water is needed to make the things American people like to have. For example, it takes thousands of gallons of water to make one pound of beef for the dinner table. It takes more than 100,000 gallons of water to make a car. If we include these uses of water, the average American uses about 2000 gallons of water a day.
It takes ______ water to make a car than to make one pound beef.
A. much
B. more
C. less
D. fewer
[单项选择] Water From the beginning, water has furnished (提) man with a source of food and a highway to travel upon. The first civilizations arose (51) water was a dominant element in the environment, a challenge (52) man’s ingenuity (聪敏，才智) . The Egyptians invented the 365-day calendar in response to the Nile’s annual flooding. The Babylonians (巴比伦人) , (53) were among the most famous law-makers in ancient times, invented laws (54) water usage. Water inspired the Chinese to build a 1,000- (55) canal, a complex system which, after nearly 2,500 years, remains still practically (56) and still commands the astonishment of engineers. But (57) never found complete solutions to their water problems. The Yellow River is also known as "China’s Sorrow"; it is so unpredictable and dangerous (58) in a single flood it has caused a million (59) . Floods slowed the great (60) A. for B. as C. because D. whereas
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