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
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
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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