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Questions 19 to 21 are based on the conversation you have just heard.

A．They are smarter than human workers.
B．They are more productive than human workers.
C．They are very durable.
D．They are easy to design.

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单项选择题

单项选择题

Questions 19 to 21 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。