2. 外语
  3. Headset stereos can ______. According the experts, when headset sound reaches 110 decibcls, it can be used at most for ______.

Headset stereos can ______. According the experts, when headset sound reaches 110 decibcls, it can be used at most for ______.

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问题 Headset stereos can ______.
According the experts, when headset sound reaches 110 decibcls, it can be used at most for ______.
选项 A、one hour
B、half an hour
C、two hours
D、three hours
答案B
解析
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