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
It was a type of urban story that continues to ______ big-city dwellers forward each day, a tale of hard work and self-starting initiative, of taking matters into one' s own hands to make dreams come true.
A．propel
B．penetrate
C．baffle
D．harness
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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