单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

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.
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单项选择题
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.
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.
单项选择题
A．He is unable to talk.B．He doesn’t like his classroom.C．He can’t find his office key.D．He has misplaced some exams.
A．He is unable to talk.
B．He doesn’t like his classroom.
C．He can’t find his office key.
D．He has misplaced some exams.
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