单项选择题

Although research has shown that asparagus does contain many important nutrients, it is not, as it was once regarded, a panacea.

A. an anomaly
B. a delicacy
C. a life-form
D. a cure-all
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单项选择题
California, the first city on the American continent, reached its peak of development and power about AD 1100.
A. summit
B. tip
C. height
D. apex
单项选择题
Throughout most of their lives, human beings perpetually learn and increase their mental capacities.
A. actually
B. readily
C. finally
D. constantly
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