单项选择题

Questions 22～25 are based on the following conversation. What’s the special feature about the treated fibers

A．They can store heat.
B．They are thick.
C．They can absorb sweat.
D．They expand when heated.

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Questions 22～25 are based on the following conversation. What’s the special feature about the treated fibers 您的浏览器不支持 audio 元素。