单项选择题

The so-called "virtual reality'(Line 2, Para. 1) mentioned in the 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 operation in a visual sense

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单项选择题

The last paragraph of the passage clearly indicates that______.

A．MSR-1 may be brought into practical application in a few years
B．as a necessary pioneer in medical science, MSR-1 has still a long way to go
C．the basic mechanical components of MSR-1 are being tested for their final assemblage
D．the commercial applications of MSR-1 will be expected in a few years

单项选择题

According to the passage, MSR-1 could be used for______.

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