单项选择题

The ______ cycle of life and death is a subject of interest to scientists and philosophers a- like.

A．incomplete
B．exceeding
C．instructive
D．eternal
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单项选择题
Careful surveys have indicated that as many as 50 percent of patient do not take drugs ______ directed.
A．what
B．so
C．which
D．as
单项选择题
America will never again have as a nation the spirit of adventure as it ______ before the West was settled.
A．has
B．did
C．was
D．would
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