单项选择题

A．Because of its size.
B．Because of its fuel.
C．Because of its complicated engine.
D．Because of its burning tim
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单项选择题
A．One; Two; One.B．Two; One; One.C．One; One; Two.D．Two; One; Two.
A．One; Two; One.
B．Two; One; One.
C．One; One; Two.
D．Two; One; Two.
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
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