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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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

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.