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
To avoid the mistakes of our forefathers, the author suggests that ______.
A．we plant more trees
B．we return to nature
C．natural sciences be taught to everybody
D．environmental education be directed to everyone
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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