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 operate.
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According m the passage, what was one disadvantage of residential expansion
单项选择题
A．Fifteen cigarette lighters.B．Fifty cigarette lighters.C．Sixty lipsticks.D．An identity card.
A．Fifteen cigarette lighters.
B．Fifty cigarette lighters.
C．Sixty lipsticks.
D．An identity card.
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