大全115

guanxi99

谁帮忙解释一下这道题?

Passage 115 (15/17)

(This passage was written in 1984.)

It is now possible to hear a recording of Caruso’s singing that is far superior to any made during his lifetime. A decades-old wax-cylinder recording of this great operatic tenor has been digitized, and the digitized signal has been processed by computer to remove the extraneous sound, or “noise,” introduced by the now “ancient” wax-cylinder recording process.

Although this digital technique needs improvements, it represents a new and superior way of recording and processing sound which overcomes many of the limitations of analog recording. In analog recording systems, the original sound is represented as a continuous waveform created by variations in the sound’s amplitude over time. When analog playback systems reproduce this waveform, however, they invariably introduce distortions. First, the waveform produced during playback differs somewhat from the original waveform. Second, the medium that stores the analog recording creates noise during playback which gets added to the recorded sounds.

 

272.
                Which of the following best describes the relationship of the first paragraph to the passage as a whole? 【   】

(A) The first paragraph introduces a general thesis that is elaborated on (elaborate on: v.详细说明) in detail elsewhere in the passage.

(B) The first paragraph presents a concrete instance of a problem that is discussed elsewhere in the passage.

(C) The first paragraph describes a traditional process that is contrasted unfavorably with a newer process described elsewhere in the passage.

(D) The first paragraph presents a dramatic example of the potential of a process that is described elsewhere in the passage.（D）

(E) The first paragraph describes a historic incident that served as the catalyst for developments described elsewhere in the passage.

hughlv

选D吧。

第一段其实就讲了一件具体的事：C同志最精彩的演出终于被数字化了（就凭这个可以排除ABCE了）。接下来第二段谈这个数字化流程的细节和好处。