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
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单项选择题
He has been plowing through a biography of Lyndon Johnson and a ______ of Henry Kissinger.
A．casualty
B．criteria
C．dissection
D．necessity
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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