单项选择题

The so-called "virtual reality "mentioned in this passage is actually.

A．a surgical tool used for operations
B．a computer system used to produce life- like illusions
C．a new kind of applications in a visual technology.
D a way to carry out operations in a visual sense

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单项选择题

What is MSR- 1 designed for

A．For making inside- eye observations.
B．For carrying out operations on human eyes.
C．For cutting of brain tumors.
D．For both B andC.

单项选择题

The phrase scale down in Par

A．3 probably means toA. reduce the proportion of the size properlyB. reduce according to the fixed pattern.C. make it diminish infinitely.D. cut down the time properly.