单项选择题

Stephen Schneider, a climatologist at Stanford, notes that unlike greenhouse gases, which ______ rapidly around the globe, the sulfate droplets tend to concentrate over industrialized regions.

A．unify
B．fragment
C．disperse
D．shatter
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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
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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