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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 represen

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

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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 in directly, and it is our final source of power. Coal represents the chemical action of the sun on green plants thousands of years ago. Water power results from the rain formed by vapor which comes from the evaporation of power. Coal represents 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 affects 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 with the sun’ s rays are concentrated through mirrors on a tube of water to create steam.
Which of the following statements is NOT true?
选项 A、Even windmill’ s action depends on the sun.
B、The sun produces enormous energy for man to make use of.
C、Some day man will be able to utilize 100 % of the solar energy that gets to the earth.
D、The sun produces different heating effects in different places.
答案C
解析
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