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

Noise suppression in phones can play an important role in making cellphone 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 cellphone networks more efficient, since when sounds that are________to the meaningful signal are transmitted, precious network bandwidth 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与F extraneous(无关的)。
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