2. 外语
  3. Which of the following statements is true? It has been proved that "Muzak" can ______.

Which of the following statements is true? It has been proved that "Muzak" can ______.

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问题 Which of the following statements is true?
It has been proved that "Muzak" can ______.
选项 A、improve productivity
B、create a pleasant atmosphere
C、cause an entire factory to sleep
D、all of the above
答案D
解析 A、B、C三项均可在文章第二段中找出。
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