单项选择题

To avoid the mistakes of our forefathers, the author suggests that______.

A．we plant more trees
B．natural sciences be taught to everybody
C．environmental education be directed toward everyone
D．we return to nature
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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
单项选择题
The author's attitude towards tile current situation ill the exploitation of natural resources is______.
A．positive
B．neutral
C．suspicious
D．critical
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