单项选择题

Which aspect of the robots is. NOT mentioned in the passage

A．The vividness of their motion.
B．Their pleasant appearance.
C．Their smart designing principles.
D．Their communicative ability.
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单项选择题
The robots can locate colored balls by means of ______.
A．a charge-coupled device
B．two cameras
C．two contact sensors
D．a digital detector
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