B. To store heat for future use.

　　C. To turn solar energy into heat energy.

　　D. To carry heat down below the surface.

　　3. From the last paragraph we can learn that　.　

　　A. some pipes have to be re-arranged in winter

　　B. the system can do more than warming up the building

　　C. the exchangers will pick up heat from the street surface

　　D. less heat may be collected in winter than in summer

　　4. What is most likely to be discussed in the paragraph that follows?

　　A. What we shall do if the system goes wrong.

　　B. What we shall do if there are no asphalt roads.

　　C. How the system cools the building in summer.

　　D. How the system collects heat in spring and autumn.

　　【参考答案】1-4 DDBC　

　　较难题目特训：节能环保类

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　We already know the fastest, least expensive way to slow climate change:　Use less energy. With a little effort, and not much money, most of us could reduce our energy diets by 25 percent or more—doing the Earth a favor while also helping our wallets.

　　Not long ago, my wife, PJ, and I tried a new diet—not to lose a little weight but to answer an annoying question about climate change. Scientists have reported recently that the world is heating up even faster than predicted only a few years ago, and that the consequences could be severe if we don’t keep reducing emissions(排放) of carbon dioxide(CO2) and other greenhouse gases that are trapping heat in our atmosphere.

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