Period 2: Reading
学习目标：
1.了解各种自然灾害及其特点
2.利用单元词汇自然灾害的危害
3.培养快速阅读的能力
学习重点：利用单元词汇自然灾害的危害
学习难点：良好阅读习惯和阅读能力的培养
课前预习
使用说明与学法指导：
1. 了解背景知识加深对文章的理解
2. 15分钟之内完成
教材助读：
Four natural disasters
A natural disaster is defined as a natural
hazard，which has a negative effect on human beings.Though some of the natural disasters are geological，many of them are due to changes in the climatic conditions.Given below are some of the very important natural disasters.
Blizzard(暴风雪)
A severe winter storm is known as a blizzard.Strong winds，heavy snowfall and low temperatures characterize
