单项选择题

He walked ______ whole day,but by 5:30 he had only covered ______ quarter of the distance.

A．the;a
B．a;the
C．the;the
D．a;a
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单项选择题
Foreign language teaching is ______ art as well as ______ science.
A．the; the
B．an; a
C．an; 不填
D．the; 不填
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