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2006年黑龙江省哈尔滨市(A) 时间______正确率_______ Nowadays more and more people care about the exploitation(开采)of the naturalresources, such as oil. Though therere many kinds of resources, with thefast increase of population and the appearance of many more factories, the morewe use, the fewer there will be left for the future, Oil is getting less andless year after year. Its said that oil can last for only 50 years. Natural gasperhaps will last about 38 years. Oil can be used in many ways and its difficult to imagine what the modernworld will be like without oil. But oil isnt easy to find and get out of theearth. Men must study the rocks. When they think the rocks in a certain placemay have oil, a metal tower is built, A machine in the tower cuts a hole downinto the ground. At the same time, a steel pipe(钢管)is pushed down to stop thesides from falling in and to keep out water. At last if the men are right,usually the oil rushes up the sides with great force(力量)by the pressure(压力)ofthe gas in the top of the rock, and it rushes high into the air. If the oilcatches a light, there will be a terrible fire. So a kind of cover is fixed onthe top of the pipe, and the oil can run out through taps(活塞). If we make a well near the middle of the oil field, we can also get gas. Suchgas is sent through pipes to towns far away and used in houses and factorieslike coal gas. | 
