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Most earthquakes occur within the upper 15 miles of the earth’s surface, but earthquakes can and do occur at all depths to about 460 miles. Their number decreases as the depth increases. At about 460 miles one earthquake occurs only every few years. Near the surface earthquakes may run as high as 100 in a month, but the yearly average does not vary much.
The extent of the disaster in an earthquake depends on many factors. If you carefully build a toy house with an erect set (坚立架), it will still stand no matter how much you shake the table. But if you build a toy house with a pack of cards, a slight shake of the table will make it fall. An earthquake in Agadir was not strong, but it completely destroyed the city. Many stronger earthquakes have done comparatively little damage. If a building is well constructed and built on solid ground, it will resist an earthquake. Most deaths in earthquakes have been due to faulty building construction or poor building sites. A third and very serious factor is panic. When people rush out into narrow streets, more deaths will result.
There is one type of earthquake disaster that little can be done about. This is the disaster caused by seismic (地震的) sea waves, or tsunamis (海啸). These are often called tidal waves, but the name is incorrect. They had nothing to do with tides. In certain areas, earthquakes take place beneath the sea. These submarine earthquakes sometimes give rise to seismic sea waves. The waves are not noticeable out at sea because of their long wave length. But when they roll into harbors, they pile up into walls of water 6 to 60 feet high. The Japanese call them “tsunamis” meaning “harbor waves”, because they reach a sizable (相当大的) height only in harbors.
Tsunamis travel fairly slowly, at speeds up to 500 miles an hour. An earthquake warning system is in use to warn all shores likely to be reached by the waves. But this only enables people to leave the threatened shores for higher ground: There is no way to stop the oncoming wave.
小题1:Which of the following can NOT be concluded from the passage?
A.The number of earthquakes is closely related to the depth.
B.Roughly the same number of earthquakes occur each year.
C.Earthquakes are impossible at depths over 460 miles.
D.Earthquakes are most likely to occur near the surface.
小题2:The destruction of Agadir is an example of       .
A.faulty building construction
B.an earthquake’s strength
C.widespread panic in earthquakes
D.ineffective instruments
小题3:According to the passage, the waves caused by submarine earthquakes are not noticeable out at sea because of       .
A.their high speed
B.the wide shores
C.their silent movements
D.their long wave length
小题4:The significance of the slow speed of tsunamis is that people may      .
A.help reduce fear
B.find ways to stop them
C.be warned early enough
D.develop warning systems
小题5:According to the passage, the number of factors that may determine the extent of the disaster in an earthquake is      .
A.two B.fiveC.four D.three

小题1:C
小题2:A
小题3:D
小题4:C
小题5:D

试题分析:本文介绍了地震的危害以及影响地震危害的3个因素,最后提及了地震和海啸之间的关系。
小题1:C 细节题。根据第一段1,2行Most earthquakes occur within the upper 15 miles of the earth’s surface, but earthquakes can and do occur at all depths to about 460 miles.说明C项的说法是错误的,故C项符合要求。
小题2:A 推理题。根据第二段But if you build a toy house with a pack of cards, a slight shake of the table will make it fall. An earthquake in Agadir was not strong, but it completely destroyed the city.说明如果建筑不够坚固,最轻微的摇晃也能导致很大的伤害。接着就举例说明了,那么在Agadir这里的建筑应该属于不够牢固的建筑,故A正确。
小题3:D 细节题。根据第三段第五行The waves are not noticeable out at sea because of their long wave length.说明D项正确。
小题4:C 推理题。根据最后一段1,2行Tsunamis travel fairly slowly, at speeds up to 500 miles an hour. An earthquake warning system is in use to warn all shores likely to be reached by the waves.说明这样的海啸是可以被预测警告的,故C项正确。
小题5:D 细节题。根据第二段6,7,8这3行内容If a building is well constructed and built on solid ground, it will resist an earthquake. Most deaths in earthquakes have been due to faulty building construction or poor building sites. A third and very serious factor is panic.说明有3个因素,故D正确。
点评:本文属于科普类短文,此类文章的最大的障碍是词汇以及考生对阅读内容的不熟悉,需要考生在阅读的时候有足够的耐心。要养成在上下文串联中猜测词义的能力,根据上下文中出现的同义词,近义词,反义词,以及词义的解释来理解生词。同时要抓住文章的中心,不要受其他信息的影响。要根据题目及选项以及文章的上下文串联合理的判断推理。
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