单项选择题

The author's attitude towards the current situation in the exploitation of natural resources is ______.

A．positive
B．suspicious
C．neutral
D．critical
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单项选择题
It can be inferred from the third paragraph that earlier generations didn't realize ______.
A．the interdependence of water, soil, and living things
B．the importance of the proper use of land
C．the harmfulness of soil destruction and river floods
D．the value of the beauty of nature
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 toward everyone
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