单项选择题

Passage One
Questions 26 to 28 are based on the passage you have just heard.

A．Radiation from the sun.
B．Radiation from the Van Allen Belts.
C．Radiation from the meteors.
D．Radiation from the Van Allen Belts and from the meteors.
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单项选择题
A．They often ride a motorcycle.B．They used to ride a horse.C．They work in the mountains of Canada.D．They ride a horse.
A．They often ride a motorcycle.
B．They used to ride a horse.
C．They work in the mountains of Canada.
D．They ride a horse.
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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