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.
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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.
单项选择题
According to the woman, what causes most of the damage to the air
A．Industrial sources.
B．Automobiles.
C．Nitrogen sources.
D．Natural activities.
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