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  3. In the second half of each year, many powerful storms are born in the tropical Atlantic and Caribbean seas. Of these, only about

In the second half of each year, many powerful storms are born in the tropical Atlantic and Caribbean seas. Of these, only about

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问题     In the second half of each year, many powerful storms are born in the tropical Atlantic and Caribbean seas. Of these, only about half a dozen generate the strong, circling winds of 75 miles per hour or more that give them hurricane status, and several usually make their way to the coast. There they cause millions of dollars of damage, and bring death to large numbers of people.
    The great storms that hit the coast start as innocent circling disturbances hundreds even thousands of miles out to sea. They travel aimlessly over water warmed by the trade winds. When conditions are just right, warm moist air flows in at the bottom of such a disturbance, moves upward through it and comes out at the top. In the process, the moisture in this warm air produces rain, and with it the heat is converted to energy in the form of strong winds. As the heat increases, the young hurricane begins to swirl in a counterclockwise motion.
    The average 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 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 destruction in a hurricane. A typical hurricane brings 6 to 12 inch downpours resulting in sudden floods. Worst of all is the powerful movement of the sea-mountains of water moving toward the low-pressure hurricane center. The water level rises as much as 15 feet above normal as it moves toward shore.
Apparently the phrase "innocent circling disturbances" in Paragraph Two means
选项 A、disturbances caused by innocent people
B、disturbances people are innocent of
C、damaging circling winds
D、harmless circling winds
答案D
解析 细节题。第二段第一句说到了innocent circling disturbances，根据上下文，可得出答案D，开始是无伤害的，慢慢地等条件成熟时，才有了损害。
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