单项选择题

The Commonwealth consists of_______countries which were former British colonies.

A．54
B．29
C．9
D．95
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We usually give a couple gifts at their marriage________.
A．to make the marriage legal
B．to make the couple richer
C．to express our good wishes
D．to show the importance of marriage
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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