单项选择题

______ has been the major problem in the Great Lakes in recent years.

A．Too many algae
B．Excessive recreational use
C．Lack of adequate rainfall
D．Too much evaporation
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单项选择题
What can best be said about the instructions given here
A．They had to be repeated.
B．They were easy for the man to remember.
C．The woman made a mistake.
D．The woman took them from a book.
单项选择题
What steps could be taken to improve the air
A．Reduce the amount of nitrogen.
B．Increase the release of oxygen.
C．Reduce nitrous oxide emissions.
D．Stop industrial activities.
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