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话题3 科普知识 飓 风 Anyone who has experienced a cyclone(飓风) will tell you how scary it can be. High winds and lots of rain can destroy a city in less than an hour. A big cyclone, named cyclone Debbie, hit Australia's east coast at the end of March. The wind was as fast as 236 km/h and destroyed houses, trees, cars and boats. Sea levels rose and flooded coastal towns. While rivers also flooded. Many cities near rivers went underwater. Hundreds of thousands of people had to leave their homes and farms, at least 8 people died, reported Courier Mail. The cyclone lasted for about 3 days. But the flooding was still happening 2 weeks later. Some cities never recover from a cyclone, while it takes years to rebuild. A tropical cyclone begins when a group of thunderstorms meet over warm, tropical waters. Lots of air and water is sucked into clouds from the ocean. Because the earth is rotating, the clouds start to spiral(螺旋式上升). That is why tropical cyclone has curved(使成弧形) shape when you see it on a map. For this reason, tropical cyclone can not form near Equator(赤道) because earth's rotation is not strong enough there. When the wind speed increases to 120 km/h, it changes from a tropical cyclone to a hurricane, typhoon or cyclone. So what is the difference between a cyclone, a hurricane, a typhoon?The answer is actually quite simple. All three are the same. We just use different names for these storms in different places. In the Atlantic and Northeast Pacific Ocean around the US, the term hurricane is used. The same type of storm in the North Pacific Ocean near China is called typhoon. Cyclones occur in the South Pacific and Indian Ocean near Australia. 1. When the wind speed increases to ________， it changes from a tropical cyclone to a hurricane. A. 2 km/m B. 3 km/m C. 4 km/s D. 5 km/s 2. The underlined word “recover” in Paragraph 3 probably means “________” in Chinese. A. 恢复 B. 康复 C. 痊愈 D. 建造 3. Australian hurricanes caused ________. A. many people lost their home B. trees, cars and boats were destroyed C. sea levels rose D. including A，B and C 4. Which of the following is TRUE? A. When the wind speed increases to 125 km/h, it changes from a tropical cyclone to a hurricane. B. A group of thunderstorms meet over cold, tropical waters. C. The earth can rotate. D. Tropical cyclones can be seen near Equator. 5. What does the passage mainly talk about? A. A terrible hurricane—Debbie. B. The earth's rotation. C. The formation of cyclone. D. A terrible hurricane and how a hurricane forms. (责任编辑：admin) |