TOEFL COURSES --> Building iBT TOEFL --> Reading Section
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Read the passage and choose the one best answer to each question.
In the twentieth century, architects in large cities designed structures in a way that reduced noise and yet made living as comfortable as possible. (1) They used such techniques as making walls hollow and filling this wall space with materials that absorb noise. Thick carpets and heavy curtains were used to cover floors and windows. Air conditioners and furnaces were designed to filter air through soundproofing materials.
(2) However, after much time and effort had been spent in making buildings less noisy, it was discovered that people also reacted adversely to the lack of sound. (3) Now architects are designing structures that reduce undesirable noise but retain the kind of noise that people seem to need. (4)
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1. According to the passage, making walls hollow and filling this wall space with materials that absorb noise results in ................
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