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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
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．Unemployment.B．Family breakup.C．Mental problems.D．Drinkin
A．Unemployment.
B．Family breakup.
C．Mental problems.
D．Drinkin
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