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.
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单项选择题
A．How the survival skills of the early people influenced their diets.B．This need to learn how to save money.C．The increasingly complex relationship between values and the use of money.D．The difficulty of trading larger and larger amounts of good.
A．How the survival skills of the early people influenced their diets.
B．This need to learn how to save money.
C．The increasingly complex relationship between values and the use of money.
D．The difficulty of trading larger and larger amounts of good.
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 time.
A．Because of its size.
B．Because of its fuel.
C．Because of its complicated engine.
D．Because of its burning time.
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