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(2020·É½¶«±õÖݸßÈýµÚ¶þ´ÎÄ£Äâ)Ask people to name the world's tallest peak and anybody with sound general knowledge will name Mount Qomolangma.But quiz them on its exact__1__and many will be not sure. 

In 1975£¬Chinese surveyors__2__that Mount Qomolangma (Mount Everest) was 8£¬848.13 meters high.As__3__improved£¬satellites£¬photoelectricity£¬radars and gravity measurement technologies were__4__to get more exact figures.Of course£¬someone still had to carry__5__to what is the world's rooftop. 

In 2005£¬a Chinese team scaled Qomolangma and found that it was not as high as that£¬as they__6__the height to be 8 844.43 meters.Scaling Qomolangma is no__7__task.The average air temperature there is£­29 degrees Celsius£¬even four degrees __8__than in Antarctica.The snow there is 4—5 meters thick and hurricane­like__9__blow all the time.Team members were training to__10__the extreme conditions.

In a nutshell£¬measuring the Qomolangma's height is a tall order£¬__11__huge amounts of money and human resources.But it is worth the__12__£®Qomolangma is the perfect__13__for observing crustal(µØ¿ÇµÄ) movements.And changes to the peak's height could__14__whether the two plates are heading toward or away from each other.  

Besides£¬the condition of snow and other natural materials at the top is an indicator of upcoming climate change on the Tibet­Qinghai Plateau.That's__15__measuring the Qomolangma's height is so significant.Put to good use£¬it can benefit mankind.

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