单项选择题

It is reported that there is no better （） for mother's milk.

A．alternative
B．equivalence
C．exchange
D．substitute

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单项选择题
The （） of human knowledge are being pushed further.

A．boundaries
B．borders
C．limits
D．edges
单项选择题
The police have asked for the （） of the public in tracking the whereabouts of the escaped criminals.

A．partnership
B．union
C．association
D．co-operation
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