单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．Make an appointment with the doctor.
B．Return the exam papers to his students.
C．Mark the latest homework assignment.
D．Put a cancellation notice on the classroom door.
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单项选择题
A．The different tastes of people for sports.B．The different characteristics of sports.C．The attraction of football.D．The attraction of baseball.
A．The different tastes of people for sports.
B．The different characteristics of sports.
C．The attraction of football.
D．The attraction of baseball.
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.
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