填空题

What indicates the success of the experiment about the two robot arms and Belle (the 4th paragraph)

【参考答案】

They corresponded to the lights at the same rate.
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A．She is likely to get lost at the bus station.B．He may be able to identify her.C．He is an old friend of hers.D．He has already picked her up at the bus station.
A．She is likely to get lost at the bus station.
B．He may be able to identify her.
C．He is an old friend of hers.
D．He has already picked her up at the bus station.
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