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【参考答案】

G
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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 fueling.
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 fueling.
填空题
D
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