单项选择题

A．Robots can’t help us with our study.
B．We need to learn to operate and control robots.
C．Robots can’t study themselves.
D．Otherwise we have nothing to do.
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A．They were used to prevent wild animals from attacking people.B．They were used to keep wild animals from rushing onto the road.C．They were used to prevent people from driving into forests.D．They were used to keep people from having traffic accidents,
A．They were used to prevent wild animals from attacking people.
B．They were used to keep wild animals from rushing onto the road.
C．They were used to prevent people from driving into forests.
D．They were used to keep people from having traffic accidents,
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