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【参考答案】

D
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单项选择题
A．To book a table for lunch.B．To make an appointment.C．To book an air ticket.D．To ask somebody for help.
A．To book a table for lunch.
B．To make an appointment.
C．To book an air ticket.
D．To ask somebody for help.
单项选择题
A．They work by motion.B．They work by electricity.C．They work by rubbing the food.D．They work by sending short waves.
A．They work by motion.
B．They work by electricity.
C．They work by rubbing the food.
D．They work by sending short waves.
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