单项选择题

A．Half an hour.
B．Longer than half an hour.
C．Longer than an hour.
D．It depends on different people.
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单项选择题
A．$60.B．$50.C．$45.D．$15.
A．$60.
B．$50.
C．$45.
D．$15.
单项选择题
A．The principle of education in US.B．Schools in the United States.C．Children are asked to go to school at a certain age.D．Elementary education in the United States.
A．The principle of education in US.
B．Schools in the United States.
C．Children are asked to go to school at a certain age.
D．Elementary education in the United States.
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