首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Since ancient times, the destructive effects of earthquakes on human lives and property have encouraged the search for reliable
Since ancient times, the destructive effects of earthquakes on human lives and property have encouraged the search for reliable
admin
2014-12-31
60
问题
Since ancient times, the destructive effects of earthquakes on human lives and property have encouraged the search for reliable methods of earthquake prediction. This challenge remains and modern scientists continue to search for reliable methods to determine the time, place and intensity of individual quakes. One prediction technique involves an analysis of the recurrence(重现)rates of earthquakes as indicators of future activity. Earthquakes are concentrated in certain areas of the world which are subject to constant movements of earth’ s plates and it is in these areas that scientists focus their investigations.
This search for pre-earthquake phenomena has received particular attention. In contrast to the ancient Greeks and Romans, who relied on the crying of dogs as a warning sign, modern scientists have focused on physical evidence for a coming earthquake. Evidence of plate strain can be found by measuring relative movements, while chemical changes also offer signals for scientists.
Analysis of the changes in magnetic properties and conductivity(传导性)of rocks provides further data for prediction. The electrical and magnetic properties of crustal(地壳的)rocks are particularly sensitive to strain. The conductivity of crustal rock is determined by the degree to which the rock is soaked with fluid and the electrolytic properties of those fluids. Before large earthquakes, small fractures develop in rocks, which change the quantity of fluid present. These changes can be measured and provide useful data. However, similar changes in the fluid, bearing capacity of rock can occur as a result of other factors such as changes in the water table, and therefore this technique is not entirely reliable.
The ancient believe that the behavior of birds, cats and dogs provides evidence of inevitable earthquakes has recently been attended as a result of tests carried out in California. It has been shown that changes taking place in the metabolic(新陈代谢的)rates of these animals correlate with subsequent seismic activity. It is assumed that the animals are sensitive to the seismic waves which precede major quakes. In zones where earthquakes are known to occur, improved construction techniques can significantly reduce the effects of seismic waves. If more accurate information regarding the time and intensity were available, governments could take even more effective measures to reduce the impact on human life, if, however, an entirely accurate prediction technique became available, there would be significant social and political implications.
It can be inferred from the passage that______.
选项
A、animals can be used as very accurate indications of earthquakes
B、coming earthquakes can be precisely predicted now
C、construction improvements can help diminish destructive effects of earthquakes
D、ancient people are wiser than modern men in using animals for earthquake predictions
答案
C
解析
推断题。根据短文最后一段中improved construction techniques cansignificantly reduce the effects of seismic waves可知选项C正确。
转载请注明原文地址:https://kaotiyun.com/show/7Dq7777K
0
大学英语四级
相关试题推荐
Holdingontothebeliefthatchildrenwillshedtheir"babyfat"astheygetoldermayallowthechildhoodobesityepidemiclas
A、Nobodystudiedhernowadays.B、Peopleforgother.C、Highereducationstoppedspreading.D、Mary’sinfluencelasted.D推理判断题。短文最后
ThePeakTimeforEverythingCouldyoupackmoreintoeachdayifyoudideverythingattheoptimaltime?Agrowingbodyof
ThePeakTimeforEverythingCouldyoupackmoreintoeachdayifyoudideverythingattheoptimaltime?Agrowingbodyof
HowShouldTeachersBeRewarded?A)Weneverforgetourbestteachers—thosewhoinspireduswithadeeperunderstandingoranend
A、Theadvertisementisprintedfineandattractivetoreaders.B、$200isreallyreasonableforaroundtripbetweenLAandNY.C、
Forthispart,youareallowed30minutestowriteanessayentitledStopRaisingDangerousAnimalsasPetsfollowingtheoutlin
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimatechange.TheEarthwarms,polarice【B1】______,andt
Aleadingbiologisthascomparedthephysiology(生理学)offlightedspecieswiththerepresentationsofspiritualandmythicalcreat
ThefloodofwomenintothejobmarketboostedeconomicgrowthandchangedU.S.societyinmanyways.Manyin-homejobsthatuse
随机试题
下列哪种情况不属于职业照射
A.硫酸镁B.缩宫素C.麦角新碱D.前列腺素E.甘露醇4小时尿量<100ml者不用
某公司为上交所上市公司,根据《上海证券交易所股票上市规则》,以下属于该上市公司关联方的有()。[2018年12月真题]Ⅰ.该公司实际控制人间接控制的甲公司Ⅱ.该公司监事钱某担任监事的乙公司Ⅲ.在该公司控股股东处担任董事的孙某担任董
甲公司是一个已经成立并运行了5年的企业,其有关情况如下:所在行业的注册资金要求很低,A公司很好地控制了所有地区的销售渠道,生产的产品所需原料A由于具有独特性,只能从供应商乙公司采购,甲公司从乙公司购入原料A占乙公司原料A销售量的90%,甲公司产品B具有独特
()不是团体咨询效果评估的方法。
渠道的()就是产品在从生产者流向最终顾客的整个过程中所经过的中间层次或环节。
“演奏家在舞台的钢琴前安静地坐了4分33秒,台下观众在这段时间内发出的杂音和环境音就是这部作品的演奏内容。”这是20世纪中叶的一首音乐作品,其创作者是()。
下面的叙述中正确的是______。
下列选项中,不属于数据模型所描述的内容的是()。
Highproductionratesareoftenachievedatthe______ofqualityofwork.
最新回复
(
0
)