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

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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