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
What’’s the US troop casualty
A．9
B．40
C．49
D．125
单项选择题
Nigeria returned to the Commonwealth after_______.
A．she had sentenced minority rights activists to death.
B．the military had resumed control of the country.
C．power had been handed over to an elected president.
D．she had negotiated with Commonwealth leaders.
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