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The power of nature,Unit 5,The violence of nature What is a tornado? A tornado is a rotating (旋轉(zhuǎn)的) column of air from a thunderstorm to the ground. The most violent have winds of more than 400 kilometres per hour. Almost all of them occur in the US，in the area from Texas in the southeast to South Dakota in the north. Tornadoes can pick up cars, trains and even houses and put them down in the next street，or even in the next town. They can take the fur off the back of a cat and the feathers off a chicken. They can destroy houses, but leave the furniture inside exactly where it was.,①On average, there are 800 tornadoes in the US each year，causing about 80 deaths and over 1,500 injuries. The worst tornado of all time occurred in 1925 ，affecting three US states: Missouri，Illinois and Indiana. ②By the time it ended, about 700 people had been killed and more than 2,000 had been injured. What is a hurricane?,Hurricanes are strong tropical (熱帶的) storms, and they usually occur in the southern Atlantic Ocean, the Caribbean Sea and the Gulf of Mexico. There are violent winds of 120 kilometres per hour or more, which cause huge waves, heavy rain and floods. There are on average six Atlantic hurricanes each year and they usually affect the east coast of the US from Texas to Maine. The worst hurricane disaster of all time occurred on the 8th September, 1900 in Galveston, Texas. Winds of about 200 kilometres per hour and fivemetre high waves hit the city. The disaster killed 6,000 people in a population of 37,000 and destroyed 3,600 buildings.,佳句仿寫 1．公共汽車被風(fēng)霧所阻，因而耽擱了。 The bus was held up by the snowstorm, ________ ________ ________ ________. 2．到去年年底他們已建造了三艘船。 By last December three ships ________ ________ ________ ________ ________. 答案：1.thus causing the delay 2.had been built by them,