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
2023-07-06
36
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 belief that the behavior of birds, cats and dogs provides evidence of inevitable earthquakes has recently gained credence as a result of tests carried out in California. It has been shown that changes take place in the metabolic(新陈代谢的)rates of these animals which 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 lives. If, however, an entirely accurate prediction technique became available, there would be significant social and political implications. [br] Which of the following do modern scientists usually use to predict a coming earthquake?
选项
A、The crying of dogs.
B、The conductivity of rocks.
C、The changes in the water table.
D、The quantity of fluid in earth.
答案
B
解析
事实细节题。定位句提到,与古希腊人和古罗马人把狗的叫声当作报警信号相比,当代科学家则集中精力收集震前的物理迹象。对岩石的磁性和传导性变化的分析提供了更多的预测数据,故B)“岩石的传导性”为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/2814085.html
相关试题推荐
HistoryofAmericanImmigrationA)Ancientpeoplesonlyl
HistoryofAmericanImmigrationA)Ancientpeoplesonlyl
HistoryofAmericanImmigrationA)Ancientpeoplesonlyl
HistoryofAmericanImmigrationA)Ancientpeoplesonlyl
Inviewofthepotentialsideeffects,pregnantwomenareadvised______(不要服用这种药)
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
随机试题
Banknotesarenotusually______intogoldnowadays.A、invertedB、revertibleC、con
关于数字印刷,说法正确的有( )。A.数字印刷能够实现可变数据印刷 B.数字
细菌尿是指中段尿培养菌落计数()A. B. C. D.
在下列网络威胁中,哪个不属于信息泄露()A.数据窃听 B.流量分析 C.
(2015年)以下属于诉讼时效中断的事由有( )。A.债权人申请支付令 B.
以下构成首次公开发行股票发行障碍的有( )。 Ⅰ.发行人的财务经理在母公司担
百合固金汤组成中含有的药物是A.生地、枳壳B.白芍、阿胶C.杏仁、胡麻D.玄参、
材料: 多年来,徐老师一直坚持还课堂于学生,他安排的"课前五分钟"深受好评。其
黄河公司系一家多元化经营的上市公司,与收入有关的部分经济业务如下: (1)其经
溃疡性结肠炎患者容易并发中毒性巨结肠的情况是A.重症患者接受激素治疗时 B.重
最新回复
(
0
)