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A. Stress. B. Smoking.
C. Lack of sleep. D. Ultraviolet light.
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单项选择题A. They will go to the airport. B. They will go to the bus stop. C. They will go to the train station, D. They will go to the subway station.

A. They will go to the airport.
B. They will go to the bus stop.
C. They will go to the train station,
D. They will go to the subway station.

单项选择题A. Pork. B. Beef. C. Fish. D. Chicken.

A. Pork. B. Beef.
C. Fish. D. Chicken.