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Questions 14-16 are based on the following monologue about making afire. You now have 15 seconds to read Questions 14-16. What is a heater used for in modern times

A．To cook food.
B．To generate electricity.
C．To frighten animals.
D．To keep warm.

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单项选择题

单项选择题

Questions 14-16 are based on the following monologue about making afire. You now have 15 seconds to read Questions 14-16. What is a heater used for in modern times 您的浏览器不支持 audio 元素。