单项选择题

______is especially proper.

A．A big gift
B．Large payment as a gift
C．A small gift from one's home
D．A gift from Singapore
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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 did not know the importance of nature study
D．they had no idea of how to make good use of raw materials
单项选择题
With a view to correct the mistakes of our forefathers, the author suggests that______.
A．we plant more trees
B．we be taught environmental science, as well as the science of plants
C．environmental education be directed toward everyone
D．we return to nature
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