1、Welcome to the unit 内容分析 本板块利用多模态语篇视频，呈现了三种较为常见的自然灾害：地震、 火山爆发和滑坡。学生通过观看视频、填写关键词，了解三种自然灾害的基本信 息，为进一步学习本单元话题做好准备。 教学目标 By the end of this section, students will be able to: 1. watch the video and get the basic knowledge of three types of natural disasters; 2. talk about other different types of natura
2、l disasters; 3. share with peers the information of the natural disasters in history. 教学建议 1. Have students watch the video and finish the blank-filling exercise on page 15. Possible answer a sudden shaking; hot gases; earth and rock 2. Have students answer the two questions on page 15. Possible ans
3、wer 1. Another type of natural disaster that I know about is tsunamis. A tsunami is a series of huge waves, often caused by an earthquake or volcanic eruption. Tsunamis often damage buildings severely and they can be deadly to humans. The 2004 Indian Ocean Tsunami killed more than 200,000 people. 2.
4、 Afghanistan Blizzard in 2008, the second worst blizzard in modern history with regard to casualties, had an estimated death toll of more than 900 due to temperatures that fell below 30 with up to 180 centimetres of snow in the mountainous regions. Some were frozen to death, and some died when their
5、 vehicles were blocked by snowdrifts. It also claimed more than 100,000 sheep and goats and 315,000 cattle. 3. Have students answer the following questions. (1) How many small earthquakes happen every year? Possible answer Several million small earthquakes happen every year. (2) What can the volcani
6、c gas and ash cause? Possible answer They can cause acid rain and even storms. (3) What are landslides often caused by? Possible answer Heavy rainfall, earthquakes, volcanic eruptions or other natural disasters. Sometimes human activities such as cutting down forests can also cause landslides. Video
7、 script Narrator: A natural disaster is a sudden natural event that causes great damage and suffering. It can happen anywhere, at any time. Lets look at some examples. 29 An earthquake is a sudden shaking of the earths surface, caused by the movement of plates underground. Earthquakes are most commo
8、n where plates meet. Several million small earthquakes happen every year, but most do not cause any damage. Serious earthquakes, however, can destroy entire cities. When a terrible earthquake hit San Francisco in 1906, about 3,000 people died and over 80 per cent of the city was destroyed. A volcani
9、c eruption occurs when hot gases, volcanic ash and even rocks escape through a large opening at the top of a volcano. The gases and ash can cause acid rain and even storms. The hot liquid rock moving down the volcano burns everything and anything in its way. The eruption of Mount St Helens in 1980 w
10、as the worst volcanic disaster in the history of the United States. It killed 57 people and about 7,000 large animals. A landslide happens when a large amount of earth and rock falls down a hill or mountain. Landslides are often caused by heavy rainfall, earthquakes, volcanic eruptions or other natu
11、ral disasters. Sometimes they are also caused by human activities such as cutting down forests. Serious landslides can cause whole mountainsides to roll away. Villages or towns located in the path of such landslides can be completely destroyed. In 2014, a landslide in India killed at least 150 people.