Finally, renewable energy sources are used even though they are often expensive to develop. One form of these is geothermal energy. In certain parts of the world the temperature of the earth increases thirty degrees centigrade with each kilometre down. At six kilometres, therefore, it rises to nearly two hundred degrees. To get the heat, water is pumped(压;抽)down into the rocks and back up to the surface. Heat from the earth is already used in certain countries.
60 How many ways of dealing with the energy problem are discussed in the text?
A. Two B. Three
C. Four D. Five.
61.The writer tells about the "special houses" because they __________
A serve as an example of energy conservation
B. show the excellent skills of the builders
C. are heated by different sources of energy
D. are warmer than other types of houses
.The underlined words “geothermal energy” in the third paragraph mean________
A. renewable source B. underground source
C. heat inside the earth
D. temperature of the earth
63. At a place where the surface temperature is 15℃,
how deep do you have to dig so as to get a temperature of 75℃?
A. One km.B. Two km. C. Three km. D. Four km.
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