单项选择题

A．very
B．exact
C．right
D．usual
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单项选择题
A．perfectB．betterC．unusualD．complete
A．perfect
B．better
C．unusual
D．complete
单项选择题
How is virtual reality surgery performed
A．It is performed by a computer-designed high precision device.
B．Surgeons wear virtual reality helmets to receive feedback provided by a computer.
C．Surgeons move robotic instruments by means of a computer linked to them.
D．A 3-D image records the movements of the surgeons during the operation.
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