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
37
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.
Recurrence rates of earthquakes can help predict future quakes because______.
选项
A、improvement in mathematics allows figures to be more accurate
B、this method has been used since ancient times and proved very effective
C、most scientists focus their investigations on the quakes of certain areas
D、continuous plate movements often result in earthquakes in certain areas
答案
D
解析
细节题。由题干可定位至第一段最后两句,根据Earthquakes areconcentrated in certain areas of the world which are subject to constant movements ofearth’s plates可知,地震总是集中在受到地球板块持续运动影响的特定区域。故选项D正确。
转载请注明原文地址:https://kaotiyun.com/show/Exq7777K
0
大学英语四级
相关试题推荐
AccordingtorecentUnitedStatesDepartmentofAgriculture(USDA)projections,thecountrywillseeasharpdropinmeatconsumpt
Selectingamajorisoneofthetoughesttasksforacollegestudent.Studentsusuallycometocollegewithamajorin【B1】______
Selectingamajorisoneofthetoughesttasksforacollegestudent.Studentsusuallycometocollegewithamajorin【B1】______
A、Becauseshewasencouragedbyherfather.B、Becauselawyersatthattimereceivedhighpay.C、Becauseshewasinfluencedbya
Holdingontothebeliefthatchildrenwillshedtheir"babyfat"astheygetoldermayallowthechildhoodobesityepidemiclas
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondtask,unlikethefirst,iscrazy.If,asI’mguessing,
ThePeakTimeforEverythingCouldyoupackmoreintoeachdayifyoudideverythingattheoptimaltime?Agrowingbodyof
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimatechange.TheEarthwarms,polarice【B1】______,andt
Forthispart,youareallowed30minutestowriteashortessayentitledBlackboard-WritingorPowerPointfollowingtheoutline
ThefloodofwomenintothejobmarketboostedeconomicgrowthandchangedU.S.societyinmanyways.Manyin-homejobsthatuse
随机试题
心脏的正常起搏点是
制动对机体的影响不包括
A.范德华力B.疏水性相互作用C.离子-偶极、偶极-偶极D.氢键E.电荷转移复合物乙酰胆碱和受体的作用是()。
表面麻醉常用局麻药为()
按照《环境影响评价技术导则—生态影响》(HJl9—2011),生态现状调查要求一级评价应给出采样地样方实测、遥感等方法测定的()等数据,给出主要生物物种名录、受保护的野生动植物物种等调查资料。
案例1.事故经过某运输公司与工程队签订了挡土墙施工合同。运输分公司指派胡某为负责掌握该工程施工进度和检查施工质量的甲方代表。某日,施工队人员王某去接水泵电线抽水时,发现土坡地表有断断续续的裂缝,便叫挖沟的全部民工离开施工地段,并叫队长翁
房间的机械排烟系统宜按()设置。
某企业拟进行一项风险投资,有甲、乙两个方案可供选择。已知甲方案净现值的期望值为2000元,标准差为600万元;乙方案净现值的期望值为2400万元,标准差为660万元,下列结论中正确的是()。
HowtoFaceFailures(1)每个人都会遇到失败。(2)对于强者,失败是成功之母。(3)我们对失败的态度。
_________服务的主要功能是实现文件的上传和下载。
最新回复
(
0
)