单项选择题

Scientists have （） for years that turbulence within the gaseous clouds found throughout the Milky Way stymies star formation, but some of the forces behind this disturbance remain （）.

A．doubted... insufferable
B．posited... unknown
C．argued... relative
D．assumed... exoteric
E． conveyed ... insuperable

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单项选择题
The vireo's comeback may prove that habitat along streams in Southern California is recovering from the effects of pollution,（） indicator of environmental health in a state that has lost most of its （） woodlands.

A．a leading ... superfluous
B．an apocryphal ... ecological
C．a partial ... surfeit
D．a telling ... riparian
E． an anecdotal ... arboreal
单项选择题
His specialty is bringing to the forefront the strange and （） acts of depravity that only the impassive and imperturbable subconscious is （） to grasp and reckon with.

A．withering... surprised
B．orthodox ... avid
C．silly... unqualified
D．unseemly... reluctant
E．macabre...suited
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