2. 外语
  3. Sound travels in the form(形式)of ______. When you talk, other people hear your voice ______.

Sound travels in the form(形式)of ______. When you talk, other people hear your voice ______.

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问题 Sound travels in the form(形式)of  ______.
When you talk, other people hear your voice  ______.
选项 A、through the bones of your head
B、from the outside
C、from the inside
答案B
解析 根据原文选[B]。
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