2. 考研
  3. The study published in the journal Nature indicates that ______. How did scientists discover the source of lead pollution in Gr

The study published in the journal Nature indicates that ______. How did scientists discover the source of lead pollution in Gr

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问题 The study published in the journal Nature indicates that ______.
How did scientists discover the source of lead pollution in Greenland?
选项 A、By analyzing the data published in journals like Nature.
B、By observing the lead accumulations in different parts of the arctic area.
C、By studying the chemical elements of soil and snow in Northeastern America.
D、By comparing the chemical compositions of leaded gasoline used in various countries.
答案D
解析 解题依据为第三段"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 Canadian gasolines and thus enabled scientists to differentiate(区分)the lead sources．The dominant lead ratio found in Greenland snow matched that found in gasoline from the United States"．从中可以看出D项"通过比较不同国家使用的无铅汽油化学成分"应该是恰当的归纳。
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