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
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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