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．Writing books that keep them interested.B．The ending of some stories.C．The fairy tales the woman has just covered.D．The science fiction the man will read.
A．Writing books that keep them interested.
B．The ending of some stories.
C．The fairy tales the woman has just covered.
D．The science fiction the man will read.
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