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听力原文：Some of the most dramatic climaxes in the history of Olympic Games have taken place in the women's 4×100 relay, the most exciting race in the track and field competition, a combination of speed and technique.
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A.
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【参考答案】

奥运史上许多充满戏剧性的高潮都发生在女子4×100米接力赛中。接力赛是田径赛中最激动人心的比赛也是速度和技术的结合。......

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Air pollution is one of the most pervasive environmental problems becauseatmospheric currents can carry contaminated air to every part of the globe.Most air pollution comes, from automobile emissions and from power plantswhat burn coal and oil to produce energy for industrial and consumer use. 【S1】______Carbon dioxide and other harmful gases releasing into the air from these 【S2】______sources adversely effect weather patterns and the health of people, animals and 【S3】______plants.Industrialized nations produce most of the world's air pollution. For 【S4】______example, because the United States is home to just 5 percent of the world'spopulation, the country generates 22 percent of human-made carbon dioxide 【S5】______emissions or 19 percent of all greenhouse gases such as carbon dioxide and 【S6】______methane. These emissions harm the environment by leading acid rain andglobal warming, and by depleting (使衰竭) the protective ozone layer which 【S7】______surround the earth.Acid rain, a serious threat around the world, occurs when sulfur dioxideand nitrogen oxide emissions from automobiles and fossil-fuel burning power 【S8】______plants to fall back to Earth as acidic precipitation. Acid rain has contaminatedmany lakes in Canada and the northeast United States and has beendocumented even in the non-industrial state of Hawaii. In the United 【S9】______Kingdom, 57 percent of all trees are severely defoliated (使落叶) owe to 【S10】______corrosive fallout, and production of food crops has been declined in many partsof the world. Acid rain has eroded the surfaces of great art and architecturaltreasures, including the ancient sculptures of Rome and the Sphinx in Egypt.【S1】
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