单项选择题

They author's attitude towards the current situation in the exploitation of natural resources is ______________.

A．critical
B．neutral
C．positive
D．suspicious
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单项选择题
To avoid the mistakes of our forefathers, the author suggests that ___________________.
A．we plant more trees
B．we return to nature
C．natural sciences be taught to everybody
D．environmental education be directed to everyone
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