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  3. All the useful energy at the surface of the earth comes from the activity of the sun. The sun heats and feeds creatures and mank

All the useful energy at the surface of the earth comes from the activity of the sun. The sun heats and feeds creatures and mank

admin2014-08-25  21
问题     All the useful energy at the surface of the earth comes from the activity of the sun. The sun heats and feeds creatures and mankind. Each year it provides men with two hundred million tons of grain and nearly ten million tons of wood, coal, oil, natural gas, and all other fuels are stored energy from the sun. (80) Some was collected by this season’s plants as carbon compounds. Some was stored by plants and trees ages ago. Even waterpower derives from the sun. Water turned into vapor by the sun fails as rain. It courses down the mountains and is converted to electric power. Light transmits only the energy that comes from the sun’s outer layer, and much of this energy that is directed towards the earth never arrives. About nine tenths of it is absorbed by the atmosphere of the earth. In fact, the earth itself gets only one half millionth of the sun’s entire output of radiant energy.  
The largest part of the light energy directed towards the earth is ______
选项 A、stored up by the plants
B、absorbed by the earth’s atmosphere
C、stored up by the animals in the form of body fat
D、used for electric power
答案B
解析 事实细节题。文中倒数第二句提到约有十分之九的太阳光被地球的大气层吸收了，真正到达的很少。
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