单项选择题

The concept of a loyal opposition——the ______ of modem democracy——rarely prevails and, much more frequently, opposition is equated with treason and ruthlessly suppressed.

A．loop
B．essence
C．equivalent
D．velocity
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单项选择题
Researchers at Children's Hospital of Pittsburgh announced they had discovered ______ evidence that a virus is involved in what used to be called juvenile diabetes.
A．incessant
B．compelling
C．identical
D．problematic
单项选择题
In the search for solution to seemingly overwhelming problems, it became increasingly ______ to include radical, even revolutionary ideas.
A．stable
B．absolute
C．immortal
D．plausible
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