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
Which of the following best describes the organization of the whole passage______
A．Two contrasting views of a problem are presented
B．A problem is examined and complementary solutions are proposed or offered
C．Latest developments are outlined in order of importance
D．An innovation is explained with its importance emphasized
单项选择题
What does the author imply by saying “living space.., is figured.., also in cubic volume______above the earth”( in 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
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