单项选择题

A．7 and half hours.
B．10hour.
C．8 and half hours.
D．8 hours.
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单项选择题
A．By ＄150.B．By ＄215.C．By ＄6,750.D．By ＄5,300.
A．By ＄150.
B．By ＄215.
C．By ＄6,750.
D．By ＄5,300.
填空题
This passage is mainly about______.
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