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  3. The energy which the sun radiates goes in every direction , and only a minute part of it falls on the earth. Even so, it represe

The energy which the sun radiates goes in every direction , and only a minute part of it falls on the earth. Even so, it represe

admin2010-07-11  66
问题     The energy which the sun radiates goes in every direction , and only a minute part of it falls on the earth. Even so, it represents power of about 5 , 000, 000 horsepower(马力)per square mile per day: the sun gives us as much energy every minute as mankind utilizes in a year. At present, we use this energy indirectly, and it is our final source of power. Coal represents the chemical action of the sun on green plants thousands of years ago. Waterpower results from the rain formed by vapor which comes from the evaporation of water under the sunshine. Even windmills operate because of air currents set in motion by the different heating effects of the sun in different places. Some day, through chemistry or some type of solar engine, we shall harness this great source of energy more directly. Already a scientist has worked out an engine, surprisingly efficient, in which the sun’s rays are concentrated through mirrors on a tube of water to create steam.
How much energy given off by the sun reaches the earth?
选项 A、100% but indirectly
B、5%
C、0.5
D、only a very tiny amount
答案D
解析 细节题。本题问太阳发出的能量有多少传到了地球上。根据文章第一句可知D。只有一小部分是对的。
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