单项选择题

These machines all look much the same, but each has its ______ function.

A．extraordinary
B．special
C．peculiar
D．exceptional
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单项选择题
In spite of all effort the doctors had done, her burns refuse to
A．heal
B．revive
C．recover
D．survive
单项选择题
Babies begin to be ______ sounds three months after they are born.
A．responsible for
B．retort to
C．responsive to
D．reply
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