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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单项选择题
The statement that every group has a culture grows out of the author's ______.
A．bias in regard to civilized human
B．philosophy
C．feeling about human beings
D．definition of culture
单项选择题
It can be inferred from the third paragraph that earlier generation didn't realize ______.
A．the importance of the proper use of land
B．the interdependence of water, soil, and living things
C．the value of the beauty of nature
D．the harmfulness of soil destruction and river floods
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