2014年职称英语理工类阅读判断习题(7)_第2页

　　1.The study published in the journal Nature indicates that

　　A.the US is the major source of lead pollution in arctic snow.

　　B.the Clean Air Act has not produced the desired results.

　　C.lead will stay in soil and snow longer than expected.

　　D.lead deposits in arctic snow are on the increase.

　　正确答案：A

　　解析：问题问的是：自然杂志上刊登的研究表明什么?第二段开头提到自然杂志上刊登的研究表明从产自美国通过空气传播的含铅气体排放是导致格陵兰雪地中铅浓度高的主要原因。而格陵兰就是位于北极圈内。因此A正确，美国是北极雪中铅污染的主要来源。

　　2.Lead accumulation worldwide decreased significantly after the use of unleaded gas in the US

　　A.was discouraged.

　　B.was prohibited by law.

　　C.was enforced by law.

　　D.was introduced.

　　正确答案：C

　　解析：美国法律强制使用无铅汽油后，世界范围的铅金属积累量明显减少了。第一段最后一句话支持这一说法，注意，文中的“mandated”与C选项中的“enforced”意思相同，都是“强制”的意思。

　　3.How did scientists discover the source of lead pollution in Greenland

　　A.By analyzing the data published in journals like Nature and Ambio.

　　B.By comparing the chemical compositions of leaded gasoline used in various countries.

　　C.By observing the lead accumulations in different parts of the arctic area.

　　D.By studying the chemical elements of soil and snow in Northeastern America.

　　正确答案：B

　　解析：问题问的是：科学家是怎样发现格陵兰的铅污染来源的?第三段提到科学家发现美国汽油中的各种铅金属比重不同于欧洲，亚洲和加拿大的。通过比较这些铅比的不同判断出格陵兰雪中铅污染主要来自美国。因此B正确。

　　4.The authors of the Ambio study have found that

　　A.forests get rid of lead pollution faster than expected.

　　B.lead deposits are widely distributed in the forests of the US.

　　C.lead accumulations in forests are more difficult to deal with.

　　D.the upper layers of soil in forests are easily polluted by lead emissions.

　　正确答案：A

　　解析：问题问的是：人类环境杂志研究的作者发现了什么?倒数第二段结尾提到森林环境处理铅的速度之快超出科学家们的预期。因此A正确。