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

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单项选择题
If a particular vaccine is produced only by one company at a single facility, there is a possibility that the supply of vaccine could grow______if the company decides to cease production.（）

A、useless
B、inexpensive
C、abstruse
D、repugnant
E、scarce
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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