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  3. The writer holds that_______. Which of the following statements is NOT true according to the passage?

The writer holds that_______. Which of the following statements is NOT true according to the passage?

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问题 The writer holds that_______.
Which of the following statements is NOT true according to the passage?
选项 A、In the past, people sometimes plugged their ears to fight against the offending noise.
B、An active noise-cancellation system follows the principles of a wave being flattered by meeting its exact opposites.
C、The first active noise-cancellation system was made in the 1930s.
D、Active noise-cancellation systems are now available on the market.
答案C
解析 细节题。题意为："根据本文，下列陈述哪句不正确?"根据文章第四段，可知噪声成熟理论的成型是在20世纪30年代，到了五六十年代在实验室里可以做到这一点。而低成本、高效率的微处理器的问世使主动消除噪声系统在商业上有了可能。因此选项"在30年代制造出第一台主动消除噪声系统"为正确答案。
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考研英语一

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