单项选择题

The primordial fireball would have been a dense roiling stew of radiation and elementary particles condensing out of the ______ energy, annihilating each other, recondensing, then colliding and disappearing all over again.

A．colossal
B．audacious
C．ambient
D．autonomous
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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
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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