单项选择题

There is a real possibility that these animals could be frightened, ______ a Sudden loud noise.

A．being there
B．there having been
C．there was
D．should there be
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单项选择题
Processes in the human body are not in all respects exactly ______ to those 'that can be produced in the experimental animals.
A．comparative
B．comparable
C．competitive
D．compatible
单项选择题
Sarah ______ articles to the New York Times from time to time.
A．distributes
B．issues
C．subscribes
D．contributes
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