单项选择题

______ could possibly be a reason that produces physical unfitness.

A．Football and sit-up
B．Automobile and football
C．TV and other modem inventions
D．Exercises
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单项选择题
The best title for this passage is ______.
A．Humans
B．Robots
C．Computer
D．Metal Hand
单项选择题
Robots can perform many different tasks by ______.
A．hand
B．arm
C．foot
D．head
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