2. 外语
  3. Noise suppression in phones can play an important role in making cellphones networks more efficient, since when sounds that are_

Noise suppression in phones can play an important role in making cellphones networks more efficient, since when sounds that are_

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问题 Noise suppression in phones can play an important role in making cellphones networks more efficient, since when sounds that are________to the meaningful signal are transmitted, precious network band width is wasted.
A. unsuitable
B. detrimental
C. irrelevant
D. confined
E. limited
F. extraneous
选项
答案C,F
解析 逻辑连接词是since，表因果，因与果的部分同义对应。前面说noise suppression(噪声抑制)在提高cellphones network的效率上很重要，说明抑制噪声能够提高网络的效率。后面说当相比meaningful signal而言________的声音被传输的时候，就会造成带宽浪费，即网络效率低下。既然噪声抑制能够提高网络效率，说明传输噪声会降低效率。因此空格部分所指的声音就是指噪声。噪声对于有用的信号而言显然是无关的，因此选C项irrelevant和F项extraneous(无关的)。
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