单项选择题

The Craighead Caverns have been known （）.

A．through history
B．since the time of the Indian nations
C．since 1905
D．since divers explored them

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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
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
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