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

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