Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions:

Many of the most damaging and life-threaling types of weather-torrential rains, severe thunderstorms, and tornadoes-begin quickly, strike suddenly, and dissipate rapidly, devastating small regions while leaving neighboring areas untouched. One such event, a tornado, struck the northeastern section of Edmonton, Alberta, in July 1987. Total damages from the tornado exceeded $250 million, the highest ever for any Canadian storm. Conventional computer models of the atmosphere have limited value in predicting short-live local storms like the Edmonton tornado, because the available weather data are generally not detailed enough to allow computers to discern the subtle atmospheric changes that precede these storms. In most nations, for example, weather balloon observations are taken just once every twelve hours at locations typically separated by hundreds of miles. With such limited data, conventional forecasting models do a much better job predicting general weather conditions over large regions than they do forecasting specific local events. Until recently, the observation-intensive approach needed for accurate, very short range forecasts, or “Nowcasts”, was not feasible. The cost of equipping and operating many thousands of conventional weather stations was prohibitively high, and the difficulties involved in rapidly collecting and processing the raw weather data from such a network were insurmountable. Fortunately, scientific and technological advances have overcome most of these problems. Radar systems, automated weather instruments, and satellites are all capable of making detailed, nearly continuous observation over large regions at a relatively low cost. Communications satellites can transmit data around the world cheaply and instantaneously, and modern computers can quickly compile and analyzing this large volume of weather information. Meteorologists and computer scientists now work together to design computer programs and video equipment capable of transforming raw weather data into words, symbols, and vivid graphic displays that forecasters can interpret easily and quickly. As meteorologists have begun using these new technologies in weather forecasting offices, Nowcasting is becoming a reality.  

Question: Why does the author mention the tornado in Edmonton, Canada?         


A. To indicate that tornadoes are common in the summer         


B. To give an example of a damaging storm  


C. To explain different types of weather         


D. To show that tornadoes occur frequently in Canada  

Đáp án và lời giải
Đáp án:B
Lời giải:

Đáp án B

Dịch nghĩa: Tại sao tác giả lại đề cập đến vòi rồng ở Edmonton, Canada?

A. Để chỉ ra rằng vòi rồng rất phổ biến trong mùa hè

B. Để cho ví dụ về một cơn bão gây thiệt hại

C. Để giải thích những loại thời tiết khác nhau

D. Để chỉ ra rằng vòi rồng thường xảy ra ở Canada

Giải thích: Ta đọc đoạn 1: “Many of the most damaging and life-threatening types of weather... One such event, a tornado, struck the northeastern section of Edmonton, Alberta” - “Rất nhiều trong số những kiểu thời tiết nguy hiểm và đe dọa mạng sống... Một sự kiện như thế, một cơn vòi rồng, đã đánh vào miền Đông Bắc của Edmonton, Alberta”    

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