GWD31中的题目

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 wo 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?

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 transmil

Without either wire or fiber-optic cable

5) Several manufacturers are developing regenerator technologies that will allow

To be transmitted many times farther than at present before requiring regeneration

我在4）和5）间很犹豫。4）给了一个信息就是说不论是 electrical wire也好，还是随后的fiber cable也好都有可能被新的技术淘汰了，是会削弱公司的乐观预期的。5）给的信息是说，如果regenerate的目的是使信号传的更远且不减弱，那么如果其中提到的技术实现了，就让regenerate的必要性成为疑问，也许根本就不用再regenerate了。

不知道大家怎么看？