单项选择题

We rarely perceive more than a minute ______ of the sights and sounds that fall upon our sense organs; the great majority pass us by.

A．fiction
B．function
C．fraction
D．friction
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单项选择题
A doctor's obligation when he can no longer ______ the approach of death is to make the patient comfortable, including easing his pain.
A．hang around
B．hang on
C．hold back
D．hold on
单项选择题
Cancer is second only ______ heart disease as a cause of death.
A．of
B．to
C．with
D．from
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