单项选择题

According to the conversation, what is one problem with arm exercises

A．They don’t get rid of flabby arms.
B．They can damage arm muscles.
C．They aren’t acceptable to most people.
D．They can raise one's blood pressure.
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What was the origin of the traditional image of robot
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B．Computer.
C．Machine.
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The computer sends signal in the form of ______.
A．electrical impulses
B．machines
C．instructions
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