单项选择题

A．Less than 15 hours.
B．15 Hours on average.
C．Up to 20 hours.
D．30 hours at most.
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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．He has been shopping around.B．He has been looking for a job.C．He has been dining in a restaurant.D．He has been driving the cab.
A．He has been shopping around.
B．He has been looking for a job.
C．He has been dining in a restaurant.
D．He has been driving the cab.
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