positive neutral suspicious critical
27. According to the author, the greatest mistake of our forefathers was that _____.
they had no idea about scientific forestry
they had little or no sense of environmental protection
they were not aware of the significance of nature study
they had no idea of how to make good use of raw materials
28. It can be inferred from the third paragraph that earlier generations didnt realize ______.
the interdependence of water, soil, and living things
the importance of the proper use of land
the harmfulness of soil destruction and river floods
the value of the beauty of nature
29. To avoid correcting the mistake of our forefathers, the author suggests that _____.
we plant more trees
natural science be taught to everybody
environmental education be directed toward everyone
we return to nature
30. What does the author imply by saying living space... is figured... also in cubic volume above the earth ?
Our living space on the earth is getting smaller and smaller.
Our living space should be measured in cubic volume.
We need to take some measure to protect space.
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