单项选择题

Which of the following statements about Niagara Falls is true

A．It is in the Great Lakes region.
B．It is about 500 to 600 feet high.
C．It is in the border area of the United States of America.
D．Both A and C
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单项选择题
The author's attitude towards the current situation in the exploitation of natural resources is ______.
A．positive
B．suspicious
C．neutral
D．critical
单项选择题
It can be inferred from the third paragraph that earlier generations didn't realize ______.
A．the interdependence of water, soil, and living things
B．the importance of the proper use of land
C．the harmfulness of soil destruction and river floods
D．the value of the beauty of nature
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