In recent years, networks of fiber-optic cable have been replacing electrical wire for transmitting telecommunications signals. Signals running through fiber-optic cables deteriorate, and so the signals must be run through a piece of equipment called a regenerator before being transmitted father. Light-Line is the leading manufacturer of signal regenerators. Therefore, Light-line is one of the companies that will most benefit if new long-distance fiber-optic telecommunications networks are constructed.
Which of the following, if true, casts the most doubt on the prediction about light-ling’s prospects?
A: Telecommunications signals sent along electrical wires can travel much farther than signals transmitted through fiber-optic before needing to be regenerated.
B: Expanding its production of regenerators will require Light-line to spend proportionately more on labor and materials.
C: The volume of signals that a fiber-optic cable can carry is several thousand times greater than the volume that can be carried by an electrical wire of similar size.
D: There are technologies that enable telecommunications signals to be transmitted without either wire or fiber-optic cable.
E: Several manufacturers are developing regenerator technologies that will allow signals to be transmitted many times farther than at present before requiring regeneration.
答案是E。这道题蛮绕的。我想了半天，最后选了A，请NN指教。
虽然我觉得A也不对，但是，比较来比较去，觉得如果electrical wires能比fiber-optic长距离的传信号，那么会减少regenerator的使用。但是，觉得又和题目第一句相悖了。
E也奇怪，很多厂商开始发展高级regenerator技术，不代表Light-Line就会失去竞争优势呀。LL也能发展高级技术啊。
晕中，请NN指教。
怎么感觉GWD的题目都需要用常识解题的？
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