单项选择题

Groundwater, a resource that exists everywhere beneath the Earth’s surface, is under increasing risk from contamination and overuse.

A．popularization
B．contraction
C．pollution
D．industrialization
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单项选择题
The new theory was corroborated.
A．confirmed
B．bleached
C．hurled
D．refrained
单项选择题
A person who deals with the public must be courteous at all times, even when he or she is very tired.
A．forthright
B．polite
C．decisive
D．neat
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