单项选择题

A. It will stop automatically.
B. It will move on at the same speed.
C. It will gradually slow down.
D. It will keep a safe distance from other trains.
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单项选择题
A. A doctor. B. A hairdresser.C. A policeman. D. A driving instructor.
A. A doctor.
B. A hairdresser.
C. A policeman.
D. A driving instructor.
单项选择题
A. Brush your teeth right before you go to bed in the evening.B. Have as few of your teeth pulled out as possible.C. Have your teeth X-rayed at regular intervals.D. Clean your teeth shortly after eating.
A. Brush your teeth right before you go to bed in the evening.
B. Have as few of your teeth pulled out as possible.
C. Have your teeth X-rayed at regular intervals.
D. Clean your teeth shortly after eating.
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