The life of a hurricane is only about nine days , but it contains almost more power than we can imagine. The energy in the heat released(释放) by a hurricane ’s rainfall in a single day would satisfy the entire electrical needs of the United States for more than six months. Water, not wind, is the main source of death and distinction (毁灭)in a hurricane . A typical hurricane brings 6 to 12 inch downpours , causing sudden floods .Worst of all is the powerful movement of the sea the mountains of water moving toward the hurricane center . The water level rises as much as 15 feet above normal as it moves toward shore.

　　(

　　) 73. When is an ordinary tropical storm called a hurricane?

　　A. When it begins in the Atlantic and Caribbean seas.

　　B. When it hits the coastline.

　　C. When it is more than 75 miles wide.

　　D. When its winds reach 75 miles per hour.

　　(

　　) 74. What is the worst thing about hurricanes?

　　A. The terrible effects of water.

　　B. The heat they give off.

　　C. That they last about nine days.

　　D. Their strong winds.

　　(

　　) 75.The underlined word “downpour ” in the last paragraph means

　　.

　　A. Heavy rainfall.

　　B. dangerous waves.

　　C. the progress of water to the hurricane center.

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