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.
　　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
　　这一段讲的是“renewable energy sources”的开发问题，并且举例“geothermal energy”是其中的一种，接下来文章进一步解释“geothermal energy”的形成及开发利用的方式。A、B、D三个选项指代的范围都太大，与下文对“geothermal energy”的解释不完全一致，因此都可以排除。下文在解释了地内温度升高的一般规律后接着说“To get the heat, water is pumped(压;抽)down into the rocks and back up to the surface”，并且说“Heat from the earth is already used in certain countries.”因此，可以确定“geothermal energy”指的是“地热资源”，所以C选项是正确的。

　　又如：Many people say, “I am much younger than my mother - or my father - was at my age.” No one says “Act your age” any more. We’ve stopped looking with surprise at older people who act in youthful ways.
　　“Act your age” means people should ______.
　　A. be active when they are old
　　B. do the right thing at the right age
　　C. show respect for their parents young or old
　　D. take more physical exercise suitable to their age
　　“We’ve stopped looking with surprise at older people who act in youthful ways” 这句话的意思是“看到老年人表现出年轻人的行为举止，我们(现在)不再感到奇怪”，即“现在不再(像以前那样)要求老年人的行为举止与他们的年龄相符”。这句话实际上是以老年人为例，对“No one says ‘Act your age’ any more”这句话进行解释，B选项符合这句话的意思，因此，是正确选项。

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