单项选择题

With a view to correcting the mistakes of our forefathers, the author suggests that______.

A．we plant more trees
B．we be taught environmental science, as well as the science of plants
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 passage that earlier generations didn't realize______.
A．the interdependence of water, soil, and living things
B．the importance of the proper land use
C．the harmfulness of soil destruction and river floods
D．the extraordinary rapid growth of population
单项选择题
According to the author, the greatest mistake of our forefathers was that______.
A．they had no idea about scientific forestry
B．they had little or no sense of environment protection
C．they were not aware of the significance of nature study
D．they had no idea of how to make good use of raw materials
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