单项选择题

What is the author's attitude to the prospect of the lakes' environment

A．Optimistic.
B．Worried.
C．Indifferent.
D．Unclear.
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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.
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