[填空题]Section D （10 marks） Questions 71-75 are based on the following passage. Alaska is disappearing slowly but surely. Since the 1950s， it is estimated that as much as 15 percent of Alaska’s area has disappeared. But how can a whole state be disappearing One reason for Alaska’s gradual disappearance is the melting its glaciers. According to one geologist at the US Geological Survey，about 98 percent of Alaska’s glaciers are either unmoving or diminishing. This diminishing seems mainly due to the increase in global temperatures. Since the 1960s， the average year-round temperature has increased by 5℉. Furthermore， the average winter temperature has increased by 8℉. Presently， an estimated 24 cubic miles of ice is disappearing from Alaskan glaciers every year. It may be even more in the near future， as some scientists predict that the average world temperature could go up 2.5 to 10℉by the year 2010. Another problem contributing to Alaska’s gradual disappearance is its permafrost. （74）{{U

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