单项选择题

To avoid the mistakes of our forefathers, the author suggests that______.

A．we plant more trees
B．natural sciences be taught to everybody
C．environmental education be directed toward everyone
D．we return to nature
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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
Most patients think that being told the truth of their illness may______.
A．slow down recovery
B．lead to suicide in some cases
C．be too hard for them to accept
D．help deal with illness
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