| To get some idea of the amount of heat
the sun gives off, think about this. If you could collect all the heat that hits
the earth in a two-week period, it would equal the amount of all other known
sources and reserves of energy: Wood, coal and oil. But even these sources of
energy depend on the sun for their formation. For example, a tree would
certainly never grow and provide fuel in the form of wood were it not for the
sun. Because the sun is so important in the production of all forms of heating fuel, more and more time and money are being spent studying ways to change power from the sun directly into a form of heat. The process currently in use for collecting energy from the sun--known as solar energy--is quite simple. The sunlight hits a metal plate known as a flat-plate collector and the plate absorbs the heat front the sun. This A. The usefulness of solar energy. B. Solar energy and its transformation into heat. C. How can solar energy be stored. D. How can solar energy be made to serve man. [单项选择]
To get some idea of the amount of heat the sun gives off, think about this. If you could collect all the heat that hits the earth in a two-week period, it would equal the amount of all other known sources and reserves of energy: Wood, coal and oil. But even these sources of energy depend on the sun for their formation. For example, a tree would certainly never grow and provide fuel in the form of wood were it not for the sun. [填空题]The amount of waste produced in the world has doubled in the past ten years.
[简答题]The heat that is produced, by burning garbage is used to boil water. (Passage 2)
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