单项选择题

A．They want to sleep well at night.
B．Their parents want them to do so.
C．They fall far behind the others.
D．They know that training is very important.
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单项选择题
A．15,000 meters.B．10,000 meters.C．40,000 meters.D．5,000 meters.
A．15,000 meters.
B．10,000 meters.
C．40,000 meters.
D．5,000 meters.
单项选择题
A．His sister.B．His father.C．His mother.D．His brother.
A．His sister.
B．His father.
C．His mother.
D．His brother.
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