2. 外语
  3. Flooding is the most destructive weather disaster in the last hundred years. A tsunami occurs when there is a shift in______.

Flooding is the most destructive weather disaster in the last hundred years. A tsunami occurs when there is a shift in______.

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问题 Flooding is the most destructive weather disaster in the last hundred years.
A tsunami occurs when there is a shift in______.
选项
答案the Earth’s crest
解析 第4个小标题Sources of floods下Unusual tidal activity部分的最后一句:it can also be caused by tsunamis，large waves in the ocean triggered by a shift in the Earth’s crust．空白处需要名词性成分。原文中后一句其实是对tsunami的定义，当然也包含其成因。而题目实质上是对海啸成因的考查，故答案为介词in后面的内容。
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