【单选题】The word conservation has a thrifty meaning. To conserve is to save and protect, to leave what we ourselves enjoy in such good condition that others may also share the enjoyment. Our forefathers had n...
A.
they had no idea about 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