The noise of a leaf blower is louder in America than that in New Zealand. The walls framing the highways are useful in decreasi

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问题 The noise of a leaf blower is louder in America than that in New Zealand.
The walls framing the highways are useful in decreasing noise pollution, because ______.

选项

答案they can reflect or absorb noise

解析 定位到文章第十段第二、三句;答案锁定在第三句“墙可以通过反射或吸收声音从而降低噪音。”
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