2. 外语
  3. The megaphone makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in a

The megaphone makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in a

admin2010-01-14  105
问题 The megaphone makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in all directions.
选项 A、slithering
B、radiating
C、interfering
D、murmuring
答案B
解析
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