大学英语四级完全解读手册-阅读理解.翻译分册

2006-3  

上海教育出版社  

常春藤英语教学研究中心  

226  

　　由上海、厦门、香港、台北、吉隆坡、洛杉矶等地英语教学专业人士联合组成的常春藤英语教学研究中心，数年来在中国英语图书市场中推出了几十种常销不衰的红蓝自测英语速记词汇表，其中附书的红蓝色彩双向助记卡还获得了中华人民共和国的专利。　　常春藤英语教学研究中心的英语教育专业人士，充分发挥与海外英语时文零距离接触的强势，密切追踪各种英语考试的最新动态，在潜心研究了中考、高考、大学四级、六级、考研、托福、雅思、GRE、职称考试、自学考试、等级英语等各个层面、几十个领域的英语考试大纲要求后，力邀国内教学领域中的资深专家和专业高手加盟，共同开发适时、专业的英语考试辅读材料。目前，由该中心精心打造的常春藤红蓝英语的各类词汇、手册、试卷已逾百种，它们在外语图书市场中声势日显，正在崛起为一个知名品牌。

阅读理解篇第一章 解题思路探索考纲分析解题分析第二章 经典样题解读Unit 1Unit 2Unit 3Unit 4Unit 5Unit 6Unit 7Unit 8Unit 9Unit 10Unit 11Unit 12Unit 13Unit 14Unit 15Unit 16Unit 17第三章 自测试题练习Test 1Test 2Test 3Test 4Test 5Test 6Test 7Test 8Test 9Test 10Test 11Test 12Test 13Test 14Test 15 Test 16Test 17 Test 18Test 19Test 20Test 21 Test 22Test 23Test 27 Test 25 翻译篇第一章 解题思路探索第二章 经典样题解读

　　Lead deposits, which accumulated in soil and snow during the 1960's and 70's, were primarily the result of leaded gasoline emissions originating in the United States. In the twenty years that the Clean Air Acts has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly.　　A study published recently in the journal Nature shows that air-borne leaded gas emissions from the United States were the leading contributor to the high concentration of lead in the snow in Greenland. The new study is a result of the continued research led by Dr. Charles Boutrin, an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic （北极的） snow were declining.　　In his new study, Dr. Boutron found the ratios of the different forms of lead in the leaded gasoline used in the United States were different from the ratios of European, Asian and Cana- dian gasoline and thus enabled scientists to differentiate （区分） the lead sources. The dominant lead ratio found in the Greenland snow matched that found in gasoline from the United States.　　In a study published in the journal Ambio ,scientists found that lead levels in soil in the Northeastern United States had decreased markedly since the introduction of unleaded gasoline.　　Many scientists had believed that the lead would stay in soil and snow for a longer period.　　The authors of the Ambio study examined samples of the upper layers of a soil taken from the same sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 1990. The forest environment processed and redistributed the lead faster than the scientists had expected. 　　……

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