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
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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”( 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
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 environmental 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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