2. 外语
  3. Solar power is one kind of clean energies that are forms of energy which do not pollute the air, the ground, or the sea. It【B1】_

Solar power is one kind of clean energies that are forms of energy which do not pollute the air, the ground, or the sea. It【B1】_

admin2012-08-10  10
问题     Solar power is one kind of clean energies that are forms of energy which do not pollute the air, the ground, or the sea. It【B1】______a number of methods of producing energy from the light of the Sun. For example, solar power is produced by collecting sunlight and【B2】______it into electricity. It has been present in many【B3】______ building methods for centuries, but has become of【B4】______interest in developed countries as the environmental costs and limited【B5】______of other power sources such as fossil fuels are realized. It is already in widespread use where other supplies of power are absent such as in remote【B6】______and in space.
    As the Earth orbits the Sun, it receives【B7】______1,400 watts per square meter of energy, as 【B8】______upon a surface kept normal at a right angle to the Sun. This number is referred to as the solar constant. Of the energy received, roughly 19% is absorbed by the atmosphere,【B9】______. The generally accepted standard is 1,020 watts per square meter at sea level.
     【B10】______. Plants use solar energy to create chemical energy through photosynthesis (光合作用).【B11】______.
【B5】
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