单项选择题

In the first two paragraphs, the author suggests

A．the bi-national joint commission has done its routine job.
B．the Boundary Water Treaty of 1909 has become out-of-date.
C．the huge drainage schemes are to blame for land run-offs.
D．the economic change has contributed to environmental improvement.

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单项选择题

Which of the following causes concerns of the public and the scientists

A．Fish farming.
B．Urban population.
C．Decreased rainfall.
D．More landslide.

单项选择题

From the text, we know that the Great Lakes

A．are equally located between Canada and the U. S..
B．contain a small part of the world's fresh water.
C．are governed neither by Canada nor by the U. S..
D．enjoy fresher water now than 25 years ago.