单项选择题

The further study of the virus samples ______ the suspicions that it was the real cause of the widespread flu in tropical areas.

A．enforced
B．confirmed
C．intensified
D．signified
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单项选择题
The fireworks in village workshop ______ due to the negligence of the workers.
A．went off
B．got off
C．came off
D．carried off
单项选择题
The new constitution will outlaw ______ in employment, housing, and education.
A．isolation
B．discrimination
C．deviation
D．distinction
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