单项选择题

A．The rocket should be inexpensive to construct.
B．The rocket is capable of lifting heavy spacecraft into orbit.
C．The rocket should be easily controlled.
D．The rocket should be inexpensive to operat
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单项选择题
A．This need to use the services of people who were not physically near.B．This need to have a common set of values.C．The fear of things that were more different than what people were used to.D．This need to store wealt
A．This need to use the services of people who were not physically near.
B．This need to have a common set of values.
C．The fear of things that were more different than what people were used to.
D．This need to store wealt
单项选择题
A．He is starting the course late.B．The subject is difficult for him.C．The professor is very reserved.D．The book is difficult to rea
A．He is starting the course late.
B．The subject is difficult for him.
C．The professor is very reserved.
D．The book is difficult to rea
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