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 the other trains.
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单项选择题
A. essentially B. completelyC. remarkably D. comparatively
A. essentially
B. completely
C. remarkably
D. comparatively
单项选择题
According to the author, knowing the cause of the misery will help ______.
A. shorten the duration of the illness
B. the patient buy medicine over the counter
C. the patient obtain cheaper prescription drugs
D. prevent people from catching colds and the flu
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