单项选择题


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

A．A space rocket can only be used once.
B．The pilot can fly a space plane just like an ordinary plane.
C．A space rocket travels much faster than a space plane.
D．Both A and B.
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单项选择题
A．Sometimes he can’t get incoming and outgoing calls and always gets a busy signal.B．When he receives a call, it always cuts off.C．When he makes calls, there are always noises.D．He always calls into wrong numbers.
A．Sometimes he can’t get incoming and outgoing calls and always gets a busy signal.
B．When he receives a call, it always cuts off.
C．When he makes calls, there are always noises.
D．He always calls into wrong numbers.
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