单项选择题

Despite the______, Alzheimer's researchers are still______about the prospects for immunization, though most agree that more results are needed from humans for us to truly understand immunization's effects.

A． advances… thrilled
B． obstacles … uncertain
C． setback… optimistic
D． publicity … divided
E． pessimism … unconvinced
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单项选择题
In the newly discovered gene, the change of a single unit of DNA converts the worm from a solitary forager into______diner.
A． an intrepid
B． a voracious
C． a gregarious
D． a nomadic
E． a rapacious
单项选择题
BLEMISHED: PERFECTION::
A． apathetic : emotion
B． stigmatized : stain
C． cherished : heirloom
D． callow : immaturity
E． tainted : reliability
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