麻烦好心人 解释 GWD32-Q9

葛佳

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 won the signals must be run through a piece of e3quiplent 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?

1)    Telecommunications signals sent along electrical wires can travel much Farther
than signals transmitted through fiber-optic before needing to be
Regenerated.
2)    Expanding its production of regenerators will require Light-line to spend
Proportionately more on labor and materials.
3)    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.
4)     There are technologies that enable telecommunications signals to be Transmitted
without either wire or fiber-optic cable
5)     Several manufacturers are developing regenerator technologies that willow signals  
To be transmitted many times farther than at present before requiring regeneration  


我选的是E

找不到答案
请NN解释

wangjialei

本人也认为选E
首先确定的是，结论为如果将要建设超长传输的光纤网络，LL公司将是最大受益者。所以，于此无关的都需要排除掉。本题求削弱。关于LL公司前景的

A，电线传输在被regenerate之前更远——但不一定regenerate之后也更远，不能直接削弱，因为题目再说regenerate如何如何；
B，扩大生产regenerator将使LL花费同比率的劳动力和材料，跟问题无关；
C，光纤可以承载更多信号，原则上应该是strengthen观点了，排除；
D，有一些技术可以既不用光纤也不用电缆，但是问题就来了，现在说的是LL跟光纤传输，而LL的收益直接原因是为了是光纤信号传的更远，D选项并没有提及跟是否能让信号传的更远等信息，而只是说另外有一种技术也可以传信号，属于新信息引入，且与内容无直接联系，排除；
E，有些厂商也在开发regenerator技术，并且可以传得更远，说明如果长距离光纤建立，LL公司也许不是唯一受益者，甚至完全不是受益者，因为可能这些厂商的产品更有优势，所以削弱。选E

个人之见，仅供参考。

葛佳

http://forum.chasedream.com/GMAT_CR/thread-193453-1-1.html