单项选择题

Robots can perform many different tasks by ______.

A．hand
B．arm
C．foot
D．head
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单项选择题
According to the passage, humans ______.
A．can control the robots by program
B．can work a day in unpleasant surroundings
C．has a mechanical arm and a metal hand
D．didn't have a head
单项选择题
The best title for this passage is ______.
A．Humans
B．Robots
C．Computer
D．Metal Hand
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