填空题

The basic education level of the general population ______ (近几十年来大大地提高了).

【参考答案】

has risen greatly in recent decades
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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
填空题
I
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