单选题：The megaphone makes the voice sound louder because it points

题目分类：理工类
题目类型：单选题
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题目内容：

The megaphone makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in all directions. A．A　slithering
B．B　radiating
C．C　interfering
D．D　murmuring

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