首页
登录
职称英语
Since ancient times, the destructive effects of earthquakes on human lives a
Since ancient times, the destructive effects of earthquakes on human lives a
游客
2024-02-06
20
管理
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. [br] 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://tihaiku.com/zcyy/3427013.html
相关试题推荐
AproverballegedlyfromancientChinawaswidelyspreadinthewest:"Ifyo
AproverballegedlyfromancientChinawaswidelyspreadinthewest:"Ifyo
AproverballegedlyfromancientChinawaswidelyspreadinthewest:"Ifyo
TodayIwouldliketotellyouabouttheeffectsofoldageonhealth.Actua
TodayIwouldliketotellyouabouttheeffectsofoldageonhealth.Actua
TodayIwouldliketotellyouabouttheeffectsofoldageonhealth.Actua
TodayIwouldliketotellyouabouttheeffectsofoldageonhealth.Actua
Sinceancienttimes,thedestructiveeffectsofearthquakesonhumanlivesa
Sinceancienttimes,thedestructiveeffectsofearthquakesonhumanlivesa
Sinceancienttimes,thedestructiveeffectsofearthquakesonhumanlivesa
随机试题
WhichofthefollowingstatementsisTRUEaccordingtothepassage?[br][origi
BOOKREVIEWMarkWertman’s
患者女,64岁。突然出现心慌,伴短暂晕厥。心电图如图25-9所示,图25-9A为
预防杂环胺类化合物污染的措施包括( )。A.增加蛋白质摄入量 B.增加脂
下列是普通高中课程标准实验教科书必修《数学》第二册(人教版)关于“平面与平面垂直
以下说法正确的是( )A.出借的包装物,其成本计入管理费用 B.生产车间使用
下列哪项在心主血脉中起关键作用A:心血充盈 B:心气充沛 C:心神安宁 D
某公司是一家大型的纺织集团,员工有四五千人,公司管理模式一直没有什么改变。近来公
按入侵探测器防范的范围划分,属于点型入侵探测器的是()。A.开关入侵探测器
围界配套声音警示系统由分布在不同防区内的( )构成。A.扬声器 B.功率放大
最新回复
(
0
)