单项选择题

A．The fuel is cheap.
B．They can be stopped and reignite.
C．They are cheap to build.
D．They must be used soon after fuelin
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单项选择题
A．To encourage them.B．To stop them immediately.C．To give some explanation.D．To leave them alon
A．To encourage them.
B．To stop them immediately.
C．To give some explanation.
D．To leave them alon
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 goo
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 goo
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