单项选择题

Questions 14～17 are based on the following dialogue. According to the woman ,why are robots becoming more widely used

A．They are smarter than human workers.
B．They are more productive than human workers.
C．They are hard-wearing.
D．They are easy to design.

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Questions 14～17 are based on the following dialogue. According to the woman ,why are robots becoming more widely used 您的浏览器不支持 audio 元素。