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.
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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.
单项选择题
Which of the following shows that water quality has improved
A．Fish and birds show residues of heavy metal.
B．Toronto has grown salmon successfully in its waters.
C．Farming has prospered in the lakeside areas.
D．Lake water has been drawn for use by the population.
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