单项选择题

A person who believes in his incompetence will ______.

A．make no real efforts
B．fail to go at a job
C．show a complete lack of confidence
D．All of the above.
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单项选择题
Why does Tom do yard work
A．To earn money for school.
B．To keep his family’s yard looking nice.
C．To he able to work outdoors.
D．To get exercise while working.
单项选择题
Which of the following is NOT important for robots to perform a task
A．A head shaped like a human being.
B．A computer brain.
C．Signals in the form of electrical impulses.
D．A claw.
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