单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

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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单项选择题

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Passage One Questions 26 to 28 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。