2. 外语
  3. Another hazard was that bottles sometimes fell off the shelves because of ______ from above.

Another hazard was that bottles sometimes fell off the shelves because of ______ from above.

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问题 Another hazard was that bottles sometimes fell off the shelves because of ______ from above.
选项 A、vocation
B、vibration
C、ventilation
D、violation
答案B
解析
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