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 extraordinarily rapid growth of population
单项选择题
What is the main idea of the passage
A．The telephone has helped to save people from illness and fire.
B．The telephone has helped to prevent wars and conflicts.
C．The telephone has made the modern oily neither better nor worse .
[D) The telephone has had positive as well as negative effects on US.
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