单项选择题

All gases and most liquids and solids expand when heated, but they do not expand equally.

A．simultaneously
B．randomly
C．accurately
D．uniformly
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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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City dwellers are exhilarated by country air.
A．amazed
B．fanned
C．humbled
D．stimulated
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