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

Lead accumulation worldwide decreased significantly after the use of unleaded gas in the US______

A．was discouraged
B．was enforced by law
C．was prohibited by law
D．was introduced

单项选择题

The study published in the journal Nature indicates that ______

A．the Clean Air Act has not produced the desired results
B．lead deposits in arctic snow are on the increase
C．lead will stay in soil and snow longer than expected
D．the US is the major source of lead pollution in arctic snow