单项选择题

They author's attitude towards the current situation in the exploitation of natural resources is ______________.

A．critical
B．neutral
C．positive
D．suspicious
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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．We need to take some measures to protect space.
B．We must preserve good living conditions for both birds and land animals.
C．Our living space should be measured in cubic volume.
D．Our living space on the earth is getting smaller and smaller.
单项选择题
According to the author, the greatest mistake of our forefathers was that ________________.
A．they had no idea of scientific forestry
B．they were not aware of the significance of nature study
C．they had little or no sense of environmental protection
D．they had no idea of how to make good use of raw materials
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