单项选择题

The lad spent seven years as （）to a master-builder so that he might learn the trade.

A．applicant
B．apprentice
C．learner
D．student

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

A．boundaries
B．borders
C．limits
D．edges
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