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单项选择题

I hour.,3 hours.,2 hours.,Four hours.;……



A．I hour.
B．3 hours.
C．2 hours.
D．Four hours.
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单项选择题A．They are more convenient.B．Their storage space is more accessible.C．They are more energy-efficient.D．They take up less floor area.

A．They are more convenient.
B．Their storage space is more accessible.
C．They are more energy-efficient.
D．They take up less floor area.

单项选择题A．Five.B．Seven.C．Six.D．Eight.

A．Five.
B．Seven.
C．Six.
D．Eight.