单项选择题

Paragraph 4 talks about dialing "911" . This number is probably （）.

A．the operator
B．an emergency number
C．a practice number for children
D．used to keep children calm

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单项选择题
It can be inferred from the passage that by the end of World War II, most Americans （）.

A．were very rich
B．lived in poverty
C．did not own automobiles
D．had own automobiles
单项选择题
22（）

A．should
B．would
C．could
D．must
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