The authors of the Ambio study examined samples of the upper layers of 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.
Scientists say both studies demonstrate that certain parts of the ecosystem respond rapidly to reductions in atmospheric pollution, but that these findings should not be used as a license to pollute.
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.
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