单项选择题

A．classes
B．groups
C．grades
D．terms
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单项选择题
Virtual reality operations are an improvement on conventional surgery in that they _______.
A．cause less pain on the wounded
B．allow the patient to recover more quickly
C．will make human surgeons' work less tedious
D．are done by robot surgeons with greater precision
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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