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
What does the author imply by saying living space is figured , also in cubic volume above the earth (Para. 3)
A．Our living space on the earth is getting smaller and smaller.
B．Our living space should be measured in cubic volume.
C．We need to take some measures to protect space.
D．We must create better living conditions for both birds and animals.
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
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