听力原文: Not long ago, some of you may have read about the team of mountain climbing scientists who helped to recalculate the elevation of the highest mountain in the world, Mount Everest(珠穆朗玛峰). Of cause the elevation of Mount Everest was determined many years ago using traditional surveying methods. But these scientists wanted to make a more precise measurement, using a new method that takes advantage of recent advances in technology; it’s called the Global Positioning System. The Global Positioning System uses 24 satellites that circle the earth. Each of the satellites is constantly sending out signals, and each signal contains important information that can be used to determine the longitude, latitude and elevation at any point on the earth's surface. Well in order to use the system to calculate amount of Everest’s elevation. Scientists need to put a special receiver on the summit to receive signals from the satellites. The problem with this was that in the past, the receivers were much too heavy for climbers to carry. But now these receivers have been reduced to about the size and weight of a hand-held telephone, so climbers were able to take the receiver to the top of the Everest, and from there, to access the satellite system signals that would allow them to determine the precise elevation. And it turns out that the famous peak is actually a few feet higher than us previously thought.
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A.The advantages of traditional surveying methods
B.Using satellites to communicate with mountain climbers
C.Obtaining new information about a mountain
D.Controlling satellites from the top of a mountain
第1题
第2题
A.玻璃没有颗粒状的微观结构
B.一切固体几乎都可以被视为缓慢流动的液体
C.玻璃比起钢材或铝合金,更适合做建筑材料
D.与钢材相比,玻璃的颗粒状的微观结构流动性更好
第3题
A.玻璃没有颗粒状的微观结构
B.一切固体几乎都可以被视为缓慢流动的液体
C.玻璃比起钢材或铝合金,更适合做建筑材料
D.与钢材相比,玻璃的颗粒状的微观结构流动性更好
第4题
A.玻璃没有颗粒状的微观结构
B.一切固体几乎都可以被视为缓慢流动的液体
C.玻璃比起钢材或铝合金,更适合做建筑材料
D.与钢材相比,玻璃的颗粒状的微观结构流动性更好
第5题
A.玻璃没有颗粒状的微观结构
B. 一切固体几乎都可以被视为缓慢流动的液体
C. 玻璃比起钢材或铝合金,更适合做建筑材料
D. 与钢材相比,玻璃的颗粒状的微观结构流动性更好
第6题
A.玻璃没有颗粒状的微观结构
B.一切固体几乎都可以被视为缓慢流动的液体
C.玻璃比起钢材或铝合金,更适合做建筑材料
D.与钢材相比,玻璃的颗粒状的微观结构流动性更好
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