单项选择题


Questions 19 to 21 are based on the conversation you have just heard.

A．Building relationship with outer space.
B．Making profits.
C．Creating a stepping-stone to scientific research.
D．Fostering international scientific cooperation.
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单项选择题
A．Trainers.B．Clowns.C．Acrobats.D．Magicians.
A．Trainers.
B．Clowns.
C．Acrobats.
D．Magicians.
单项选择题
A．Wars or natural disasters make them lose their families.B．They want to help their families earn enough money to survive.C．They are poor.D．All the above.
A．Wars or natural disasters make them lose their families.
B．They want to help their families earn enough money to survive.
C．They are poor.
D．All the above.
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