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单项选择题

Virtual reality(or VR(1)is kind of a buzzword these days in computer graphics．VR is artificial reality created by a computer that is so enveloping that it is perceived by the mind as being truly real．VR exists in many(2)．A traditional view of virtual reality uses headsets and data gloves．The headset serves as the eyes and ears to your virtual world，projecting sights and sounds generated by the computer．The data glove becomes your hand，enabling you to interact with this (3) world．As you move your head around．the computer will track your motion and display the right image．VR is the most demanding(4)for computer graphics，requiring hardware and software capable ofsupporting realtime 3D(5)．

(1)
A．for certain
B．for any sake
C．for all
D．for short
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单项选择题 Linux中一种常用的引导工具是(2)，而测试与P地址为165．113．1．170的网关是否连通的命令是ping 165．113．1．170。

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