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【参考答案】

heavier改为greater。
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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.
单项选择题
A．How lucky you are!B．You are not lucky.C．You are lucky.D．You’re lucky, aren’t you
A．How lucky you are!
B．You are not lucky.
C．You are lucky.
D．You’re lucky, aren’t you
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