单项选择题


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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B
单项选择题
A．Exercising the entire body,B．Having your blood. Pressure to, ken daily.C．Losing weight prior to exercising.D．Weighing in before each exercise session.
A．Exercising the entire body,
B．Having your blood. Pressure to, ken daily.
C．Losing weight prior to exercising.
D．Weighing in before each exercise session.
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