单项选择题

Educational TV stations offer teaching in various （） ranging from home nursing to art appreciation.

A．courses
B．directions
C．points
D．subjects

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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
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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