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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．Advantages and disadvantages of freezers.B．The best energy-efficient freezer.C．Defrosting a manual defrost freezer.D．Choosing and caring for a freezer.

A．Advantages and disadvantages of freezers.
B．The best energy-efficient freezer.
C．Defrosting a manual defrost freezer.
D．Choosing and caring for a freezer.

单项选择题A．He was eager to do the course.B．He had done a lot of outdoor exercise.C．He enjoyed adventurous activities.D．He was timid and reluctant to go to the course.

A．He was eager to do the course.
B．He had done a lot of outdoor exercise.
C．He enjoyed adventurous activities.
D．He was timid and reluctant to go to the course.