2. 外语
  3. To prevent a repetition of this dreadful occurrence, we must discover the ______ element in the food that was served.

To prevent a repetition of this dreadful occurrence, we must discover the ______ element in the food that was served.

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问题 To prevent a repetition of this dreadful occurrence, we must discover the ______ element in the food that was served.
选项 A、unknown
B、toxic
C、kind
D、shameful
答案B
解析 (toxic有毒的)。句意为：为了防止这种可怕的事件再度发生，我们一定要找出端上来的食品中有毒的成分。A．unknown未知的；C．kind仁慈的；D．shameful可耻的。
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