A、
A dog that runs on three legs.
B、
New robot dogs developed by scientists.
C、
New robots that can help people in natural disasters.
D、
New robots that can continue working when injured.
【正确答案】
D
【答案解析】
A、
They can do everything that people can't do.
B、
They will be improved in two years.
C、
They can work in dangerous situations.
D、
They can mend themselves when injured.
【正确答案】
C
【答案解析】
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