单项选择题

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单项选择题
The phrase scale down in Para. 3 probably means to
A．reduce the proportion of the size properly
B．reduce according to the fixed pattern.
C．make it diminish infinitely.
D．cut down the time properly.
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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