Why are scientists surprised by the findings in their noise study? When the writer says we cannot return to the good old days,

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问题 Why are scientists surprised by the findings in their noise study?
When the writer says we cannot return to the good old days, he means that ______.

选项 A、our society is becoming much worse than before
B、in our modern society it is hard to lead a quiet life
C、the old days were much happier than the present time
D、it is impossible for us to reduce noise back to previous levels

答案D

解析
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