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(壓;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
　　這一段講的是“renewable energy sources”的開發(fā)問題，并且舉例“geothermal energy”是其中的一種，接下來(lái)文章進(jìn)一步解釋“geothermal energy”的形成及開發(fā)利用的方式。A、B、D三個(gè)選項(xiàng)指代的范圍都太大，與下文對(duì)“geothermal energy”的解釋不完全一致，因此都可以排除。下文在解釋了地內(nèi)溫度升高的一般規(guī)律后接著說“To get the heat, water is pumped(壓;抽)down into the rocks and back up to the surface”，并且說“Heat from the earth is already used in certain countries.”因此，可以確定“geothermal energy”指的是“地?zé)豳Y源”，所以C選項(xiàng)是正確的。

　　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” 這句話的意思是“看到老年人表現(xiàn)出年輕人的行為舉止，我們(現(xiàn)在)不再感到奇怪”，即“現(xiàn)在不再(像以前那樣)要求老年人的行為舉止與他們的年齡相符”。這句話實(shí)際上是以老年人為例，對(duì)“No one says ‘Act your age’ any more”這句話進(jìn)行解釋，B選項(xiàng)符合這句話的意思，因此，是正確選項(xiàng)。

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