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  3. Electronic computer speeds are restricted not only by the speed of electrons in matter but also by the escalating density

Electronic computer speeds are restricted not only by the speed of electrons in matter but also by the escalating density

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问题            Electronic computer speeds are restricted not only by the speed of electrons
       in matter but also by the escalating density of interconnections necessary to
       connect the electronic gates on microchips. Electrical engineers and physicists
Line    have been developing and augmenting the technologies of analog and digital
(5)     optical computing, in which the information is primarily carried by photons
       rather than by electrons. Optical computing could, in principle, generate much
       higher computer speeds, but one of the problems it has encountered lies in
       accuracy, for these devices have practical limits of 8 to 11 bits of accuracy in
       basic operations.  Recent research  has evinced  that digital  partitioning
(10)   algorithms in tandem with error-correction codes, can substantially enhance the
       accuracy of optical computing operations. In the near term optical computers
       will most likely be hybrid optical/electronic systems that preprocess input data
       for computation and post-process output data via electronic circuits, but
       nevertheless, the prospect of all-optical computing remains highly attractive.
According to the passage, which of the following is true concerning optical computers?
选项 A、Researchers have not yet discovered a means of transporting photons more efficiently.
B、Their primary limitation is the density of connections required between electronic microchip gates.
C、Their accuracy level is poor at 8 to 11 bits, but still superior to that of electronic computers.
D、They invariably rely on electronic circuits to preprocess input data for computation.
E、Both analog and digital forms of optic computing are presently being developed by scientists.
答案E
解析
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