2021年12月英语四级阅读考试训练及答案232021年6月英语四级真题及答案.doc
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1、2021年12月英语四级阅读考试训练及答案23 2021年6月英语四级真题及答案科普:自然资源 295词Every year, earthquakes are responsible for a large number of deaths and vast amount of destruction in various parts of the world.Most of these damaging earthquakes occur either in a narrow belt which surrounds the Pacific Ocean or in a line which
2、e_tends from Burma to the Alps in Europe.Some of the destruction is directly caused by the quake itself.An e_ample of this is the collapse of buildings as a result of vibration.Other damage results from landslides, tsunamis (large ocean waves) or major fires which are initiated by the quake.There ar
3、e about a million quakes a year.Fortunately, however, not all of them are destructive.The intensity of an earthquake is measured on the Richter Scale, which goes from 0 upward.The highest magnitude recorded to date is 8.9.Major damage generally occurs from quake ranging upwards from 6.0.E_ceptions t
4、o this are those whose epicenters are located far from the inhabited areas. The actual cause of the quake itself is the breaking apart of rocks at or below the earths surface.This is produced by pressure which scientists believe may be due to a number of reasons, two of which are the e_pansion and c
5、ontraction of the earths crust and continental drift. In order to minimize the damage and lessen some of the suffering results from earthquakes, scientists are working on ways to enable accurate prediction.Two of the instruments presently in use to achieve this goal are seismograghs and tiltmeters.T
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