Flooding is the most destructive weather disaster in the last hundred years. When a dam breaks, there emerges ______ which is c

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问题 Flooding is the most destructive weather disaster in the last hundred years.
When a dam breaks, there emerges ______ which is caused by the sudden re- lease of a huge amount of water.

选项

答案a violent “wall” of water

解析 第4个小标题Sources of floods下Break of man-made dams部分的倒数第4句:When this happens, a massive amount of water is released all at once,causing a violent“wall” of water to push across the land.空白处需要填入名词性成分。题目则是先果后因,而原文中是先因后果,故答案为causing后的成分。
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