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Solar energy is man's most important energy source. As the name implies, solar is the energy from the sun's rays. The amount of energy that the earth receives from the sun is many times（1）the amount used by man. If a（2）way to use it fully could be developed,（3）source would be needed. It is, however, used efficiently by plants that（4）the food on which animals directly or indirectly depend. Solar energy is（5）underground in the form of fossil fuels such as coal and petroleum.
In the（6）an important source of energy was（7）in the form of wood. The Industrial Revolution needed the use of coal. Recently, the fossil fuels have become the chief energy source（8）nuclear power developing very rapidly. The fossil fuels are our present main source of energy. Petroleum will support us for about （1）（5） years. Natural gas, which is（9）of the fossil fuels, will probably be the first to be（10）.
（6）下列正确的是（ ）

A.past

B.presentday

C.future

D.longrun

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