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There are different ways in which people try to deal with the problem of energy. One way is greater production of common energy

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问题     There are different ways in which people try to deal with the problem of energy. One way is greater production of common energy sources(能源), such as coal, oil and gas. The trouble with these sources, however, is that they are not renewable.
    Another way is energy conservation(节能), which means using energy more efficiently. In some very cold countries people build special houses to save energy. They place materials between the inside and the outside of the walls of the house to keep the cold out and the warmth in. The house is heated by the lights, the body heat of people and the other equipment in it.
    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 kilometer down. At six kilometers, 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.  
The underlined words "geothermal energy" in the third paragraph mean______,
选项 A、renewable source
B、underground source
C、heat inside the earth
D、temperature of the earth
答案C
解析 推断题。从文中说明地下温度越往下越高，人们用水来置换提取量，就可以推断出划线部分指的是地热。
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