单项选择题

Which of the following is the most suitable title of this passage

A．New Entertainment Robots Produced in Japan.
B．QRIO--the Robot Dancers.
C．Robots--Man's Best Friend.
D．An Extraordinary Performance in Sony's Lab.
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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.
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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