单项选择题

A．The fuel is cheap.
B．They can be stopped and reignited.
C．They are cheap to build.
D．They must be used soon after fuelin
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单项选择题
A．This morning.B．This afternoon.C．After lunch.D．Before lunc
A．This morning.
B．This afternoon.
C．After lunch.
D．Before lunc
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
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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