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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单项选择题
Which of the following did Gregory Scott Johnson NOT do in a 1985 criminal case
A．Murdering an old woman.
B．Robbing an old woman.
C．Beating and stomping on an old woman.
D．Breaking into the house of an old woman.
单项选择题
The passage is mainly about________.
A．a special expedition into the woods
B．fife of adults in a special work shop
C．different ideas of adults and teenagers
D．how adults and teenagers live together in a special work group
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