【单选题】
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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根据网考网移动考试中心的统计,该试题:
24%的考友选择了A选项
7%的考友选择了B选项
66%的考友选择了C选项
3%的考友选择了D选项