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.
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