单项选择题


Questions 13 to 15 are based on the conversation you have just heard.

A．A satellite.
B．An ordinary plane.
C．A space plane.
D．A space rocket.
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单项选择题
A．Doctor and patient.B．Receptionist and client.C．Teacher and student.D．Partners.
A．Doctor and patient.
B．Receptionist and client.
C．Teacher and student.
D．Partners.
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