单项选择题

Fiber-optic cables can carry hundreds of telephone conversations ______.

A．simultaneously
B．spontaneously
C．homogeneously
D．contemporarily
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单项选择题
The______ in my son's clothes are beginning to come apart.
A．seams
B．beams
C．rims
D．segments
单项选择题
Rumors are everywhere, spreading fear, damaging reputations, and turning calm situations into______ ones.
A．turbulent
B．tragic
C．vulnerable
D．suspicious
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