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.
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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
单项选择题
What kind of psychological background can probably best account for crimes Ramos has committed
A. He is being insane.
B. He has had some family murdering records.
C. He has been associated with some important figures in the countryD The article didn’t give a clear answer to the question.
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