单项选择题

The Industrial Revolution marked the beginning of an epoch of exodus from rural areas to cities.

A．episode
B．period
C．migration
D．story
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单项选择题
City dwellers are exhilarated by country air.
A．amazed
B．fanned
C．humbled
D．stimulated
单项选择题
Enamel, the hardest substance in a human being’s body, covers the entire crown of the tooth.
A．whole
B．inseparable
C．superficial
D．main
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