单项选择题

A．Because people have more free time to spend than before.
B．Because people meet more problems than their parents.
C．Because people have more choices from how-to books than any other books.
D．Because modern life is more difficult to deal with.
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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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