单项选择题

A．Less than ten minutes.
B．About twenty minutes.
C．Forty-five minutes.
D．Over an hour.
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单项选择题
A．Its texture.B．Its size.C．Its preservation.D．Its shape.
A．Its texture.
B．Its size.
C．Its preservation.
D．Its shape.
单项选择题
A．8. 5 hours.B．7. 5 hours.C．8 hours.D．9 hours.
A．8. 5 hours.
B．7. 5 hours.
C．8 hours.
D．9 hours.
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