that has ever happened (发生的最严重的一次地震)in the United States.

　　Ⅳ.回顾话题

　　用本模块词汇或句式完成写作任务

　　平均起来，每年都会发生各种各样的自然灾害，甚至有些会出乎人们的意料。昨天，一场强烈的飓风突然袭击了该地区，导致很多房屋和车辆被毁，甚至有两人被埋在倒塌的房屋下。幸运的是，事后人们及时把他们救了出来。在将来，有可能有经验的专家能够准确地(accurately)预测一些可怕的自然灾害。

　　【参考范文】

On average, all kinds of natural disasters will take place every year, and even some are beyond people's expectation.A violent hurricane suddenly struck/hit the area yesterday, causing the ruin of many houses and cars.What's worse, even two persons