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
2023-07-05
56
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:http://tihaiku.com/zcyy/2810382.html
相关试题推荐
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
Sinceancienttimes,thedestructiveeffectsofearthquakesonhumanlivesa
Sinceancienttimes,thedestructiveeffectsofearthquakesonhumanlivesa
Sinceancienttimes,thedestructiveeffectsofearthquakesonhumanlivesa
Sinceancienttimes,thedestructiveeffectsofearthquakesonhumanlivesa
Sinceancienttimes,thedestructiveeffectsofearthquakesonhumanlivesa
Isitpossibletopersuademankindtolivewithoutwar?Warisanancientin
[originaltext]Inancienttimesthemostimportantexaminationswerespoken,
[originaltext]Inancienttimesthemostimportantexaminationswerespoken,
随机试题
Someconsumerresearchersdistinguish【C1】______"rational"motivesand"emot
[originaltext]M:Areyousureyouwanttogotherenow?Thisisgoingtomakeu
Ithappenstoeverymedicalstudentsoonerorlater.Yougetacoughthatpe
DemographyisthestatisticalstudyofhumanpopulationItcanbea-generalsc
仅需要报警,不需要联动自动消防设备的保护对象宜采用()。A.集中报警系统
原发性血小板减少性紫癜,下列哪种血小板表面相关免疫球蛋白和补体特异性较强()A
下列物质能竞争性对抗磺胺作用的是A:GABA B:PABA C:丙磺酸 D
中国是最早筑城的国家之一。数千年来,中国先后修建了至少数千座不同等级的各类城池,
既可直刺、深刺,又可针刺放血的腧穴是A.肩井 B.承泣 C.瞳子髎 D.委
相对于采用目标价值权数,采用市场价值权数计算的平均资本成本更适用于未来的筹资
最新回复
(
0
)