单项选择题

According to Scheetz' s statement (Para. 4), the author means ______

A．people who have a strategic mind
B．people who are talented in fine arts
C．people who are ambitious and aggressive
D．people who have received training in mechanics
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单项选择题
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 observing the lead accumulations in different parts of the arctic area.
C．By studying the chemical dements of soil and snow in Northeastern America.
D．By comparing the chemical compositions of leaded gasoline used in various countries.
单项选择题
It can be inferred from the last paragraph that scientists ______
A．are puzzled by the mystery of forest pollution
B．feel relieved by the use of unleaded gasoline
C．still consider lead pollution a problem
D．lack sufficient means to combat lead pollution
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