2010年职称英语考试理工类C级阅读理解真题及答案.docVIP

2010年职称英语考试理工类（C级）考试真题及答案解析 ? 　　第4部分：阅读理解(第3l一45题，每题3分，共45分) XueHuiedu.Com 　　下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。 　　第一篇 　　Arctic Melt 　　Earths North and South Poles ale famous for being cold and icy．Last year，however，theamount of ice in the Arctic Ocean feU t0 a record low． 　　Normally，ice builds in Arctic waters around the North Pole each winter and shrinks during thesummer．But for many years，the amount of ice left by the end of summer has been declining． 　　Since 1979，each decade has seen an 11．4 percent drop in end of summer ice cover．Between1981 and 2000，ice in the Arctic lost 22 percent of its thickness，becoming 1．13 meters thinner．xｕehｕｉedu.coｍ 　　Last summer，Arctic sea ice reached its skimpiest levels yet．By the end of summer 2007，theice had shrunk to cover iust 4．2 million square kilometers．Thats 38 percent less area than the average cover at that time of year．And its a very large 23 percent below the previous record low，whichwas set just 2 years ago．This continuing trend has scientists concerned． 　　There may be several reasons for the ice melt，says Jinlun Zhang，an oceanographer at the University of Washington at Seattle．Unusually strong winds blew through the Arctic last summer．Thewinds pushed much of the ice out of the central Arctic．leaving a large area of thin ice and open water．XueHuiedu.Com 　　Scientists also suspect that fewer clouds cover the Arctic now than in the past．Clearer skies allow more sunlight to reach the ocean．The extra heat warnls both the water and the atmosphere．Inparts of the Arctic Ocean last year，surface temperatures were 3．5 warmer than average and 1．5warmer than the previous record high． 　　With both air and water getting warmer，the ice is melting from both above and below．In someDarts 0f the Beaufort Sea，north of Alaska and western Canada，ice that measured 3．3 meters thickat the beginning of the summer measured just 50 centimeters by seasons end．学.慧_教.育@网$ 　　The new measurements suggest that melting is far more severe than scien