单项选择题

Native American artwork and artifacts have been enthusiastically collected and studied abroad for a number of years.

A．eagerly
B．periodically
C．thoroughly
D．systematically
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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
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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