Why are scientists surprised by the findings in their noise study? From the last sentence of the passage we can learn that ____

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问题 Why are scientists surprised by the findings in their noise study?
From the last sentence of the passage we can learn that ______.

选项 A、we can get public noise under control if we effectively draw attention to it
B、sometimes we have to shout loudly so that others can hear us
C、shouting is a chief cause of noise pollution nowadays
D、it is important to warn people of the danger of noise pollution

答案A

解析
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