单项选择题

Modern medicine and new methods of food production allow adults to live longer and babies to ______ , not die soon after birth.

A．survive
B．grow up
C．exist
D．develop
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The key ______ good health is to eat and sleep regularly.
A．to
B．for
C．of
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单项选择题
It took him several months to ______ the wild horse.
A．tend
B．cultivate
C．breed
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