Unit 2 Period Ⅰ　Welcome to the unit & Reading—Comprehending（课时作业）-【优化探究】2021-2022学年新教材高中英语必修第三册同步导学案（译林版）

Ⅰ.阅读理解 A Natural disasters take many different forms and can happen without warning. Earthquakes, floods, volcanoes, droughts, typhoons and hurricanes are all natural disasters. The earthquake of 26 December 2004 resulted in one of the worst natural disasters in living memory. It was a massive underwater quake and occurred in the Indian Ocean. This caused a huge tsunami to cross the Indian Ocean. It destroyed coastlines and communities and brought death and destruction to many people. The survivors needed fresh water, food and shelter as well as medical help. People from all over the world gave money. The surface of the Earth has not always looked as it does today; it is moving continuously (although very slowly) and has done so for billions of years. This is one cause of earthquakes，when one section of the Earth crashes with another. Scientists can predict where this might happen and the area between plates is called a fault line. However, earthquakes do not always happen on Fault lines, which is why they are so dangerous and unpredictable. All the disasters are very dangerous and continue to kill thousands of people each year, but they are nowhere near the most dangerous disaster to ever happen on earth. One type of event in the earth's history has regularly killed millions of beings: asteroid (小行星)impacts. About once every million years the Earth is hit by a piece of rock and ice from space large enough to cause massive destruction (including earthquakes, volcanoes and ice ages) and sometimes to kill entire species. Sixty­five million years ago more than half the earth's species were killed by such a disaster, including all the dinosaurs. Disasters on the Earth may seem dangerous, but the biggest threat to humans is likely to come from space. [语篇解读]　本文是一篇科普说明文。文章通过讲述2004年12月26日发生在印度洋底的地震以及其产生的海啸，说明自然灾害在不知情的情况下会以不同的方式发生；另外讲述了为什么地震如此危险和不可预测的科学原理；接下来讲述6 500万年前发生的恐龙大灭绝事件告诉我们所有这些自然灾害产生的结果是灾难性的，但对我们人类威胁最大最具灾难性的是太空来物。 1．What did the world do when the tsunami occurre