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  3. The noise of a leaf blower is louder in America than that in New Zealand. According to Bob Bernhard, in order to reduce road no

The noise of a leaf blower is louder in America than that in New Zealand. According to Bob Bernhard, in order to reduce road no

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问题 The noise of a leaf blower is louder in America than that in New Zealand.
According to Bob Bernhard, in order to reduce road noise, people must change ______.
选项
答案the road surface
解析 定位到文章第九段首句；可知工程师Bob Bernhard认为减少道路噪音的方法不是更换轮胎而是改变路面状况。
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