2. 外语
  3. Which of the following best describes the relationship of the first paragraph to the passage as a whole? Which of the following

Which of the following best describes the relationship of the first paragraph to the passage as a whole? Which of the following

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问题 Which of the following best describes the relationship of the first paragraph to the passage as a whole?
Which of the following statements about the numbers by which sound is represented in a digital system can be inferred from the passage?
选项 A、They describe the time interval between successive sounds in a passage of music.
B、They model large changes in the amplitude of the initial sound with relatively poor precision.
C、They are slightly altered each time they are read by the playback apparaturs.
D、They are not readily altered by distortion and noise accumulated as the digital signal is stored and manipulated.
E、They are stored in the recording medium in small groups that can be read simultaneously by the playback apparatus.
答案D
解析 To answer this question, you must use information contained in the passage to draw an inference about the numbers by which sound is represented in digital recording systems. The best answer is D because the passage states that storage and manipulation have little effect on the sound quality of digital recordings. Since the sounds of a digital recording are represented by number, it may thus be inferred that the numbers themselves are not easily altered by storage and manipulation. Choice A is not correct: since the passage makes no mention of time intervals between successive sounds, one cannot infer that the numbers describe such intervals. Choice B can be eliminated because in its description of sampling error, the passage suggests that small changes in amplitude are sometimes recorded inaccurately in digital systems. However, the passage does not indicate that digital systems have difficulty modeling large changes in amplitude. Choices C and E are incorrect because there is no indication in the passage that the numbers representing sounds in a digital recording are altered in any way during playback, nor that the numbers are stored and read in groups.
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