How did scientists discover the source o-考呗网

英语四级

单选题How did scientists discover the source of lead pollution in Greenland（　　）?

A．By analyzing the data published in journals like Nature and Ambi
B．By observing the lead accumulations in different parts of the arctic are
C．By studying the chemical elements of soil and snow in Northeastern Americ
D．By comparing the chemical compositions of leaded gasoline used in various countrie

参考答案：D进入在线模考

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2The authors of the Ambio study have found that（　　）.

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3It can be inferred from the last paragraph that scientists（　　）.

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