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
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Cancer is second only ______ heart disease as a cause of death.
A．of
B．to
C．with
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The ______ tales between China and Japan were the base of the later agreement.
A．initial
B．primitive
C．fundamental
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