单项选择题

The heavily populated area was a breeding place for______ diseases.

A．powerful
B．infectious
C．influential
D．suspicious
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单项选择题
The most influential TV center ABC in the U. S. can react instantly to worldwide incidents and offer______ information.
A．sober
B．updated
C．upheld
D．upgraded
单项选择题
Mary is an active______ in social work. She spends much time staying with orphan children every summer.
A．patriot
B．pilgrim
C．participant
D．parasite
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