单项选择题

A. A videotape.
C. A picture.
B. A book.
D. An oxygen tank.
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单项选择题
A. Ten minutes of exercise each day. C. Vitamin supplements. B. Ultraviolet rays. D. Eight hours of sleep each night.
A. Ten minutes of exercise each day. C. Vitamin supplements.
B. Ultraviolet rays. D. Eight hours of sleep each night.
填空题
O
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