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
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
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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