单项选择题


Questions 19 to 21 are based on the conversation you have just heard.

A．To improve his skating techniques.
B．To take a vacation.
C．To take a course.
D．To learn to ski.
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单项选择题
Why are sled dogs said to be physical wonders
A．Because they are raised by wolves.
B．Because they can stand most severe weather.
C．Because they are fastest runner among Arctic animals.
D．Because they can bear goods like horses do.
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