首页
登录
职称英语
Most earthquakes occur within the upper 15 miles of the earth’s surface. But
Most earthquakes occur within the upper 15 miles of the earth’s surface. But
游客
2023-11-09
40
管理
问题
Most earthquakes occur within the upper 15 miles of the earth’s surface. But earthquakes can and do occur at all depths to about 460 miles. Their number decreases as the depth increases. At about 460 miles one earthquake occurs only every few years. Near the surface earthquakes may run as high as 100 in a month, but the yearly average does not vary much. In comparison with the total number of earthquakes each year, the number of disastrous earthquakes is very small.
The extent of the disaster in an earthquake depends on many factors. If you carefully build a toy house with an Erector set, it will still stand no matter how much you shake the table. But if you build a toy house with a pack of cards, a slight shake of the table will make it fall. An earthquake in Agadir, Morocco, was not strong enough to be recorded on distant instruments, but it completely destroyed the city. Many stronger earthquakes have done comparatively little damage. If a building is well constructed and built on solid ground, it will resist an earthquake. Most deaths in earthquakes have been due to faulty building construction or poor building sites. A third and very serious factor is panic. When people rush out into narrow streets, more deaths will result.
The United Nations has played an important part in reducing the damage done by earthquakes. It has sent a team of experts to all countries known to be affected by earthquakes. Working with local geologists and engineers, the experts have studied the nature of the ground and the type of most practical building code for the local area. If followed, these suggestions will make disastrous earthquakes almost a thing of the past.
There is one type of earthquake disaster that little can be done about. This is the disaster caused by seismic sea waves, or tsunamis.(These are often called tidal waves, but the name is incorrect. They have nothing to do with tides.)In certain areas, earthquakes take place beneath the sea. These submarine earthquakes sometimes give rise to seismic sea waves. The waves are not noticeable out at sea because of their long wave length. But when they roll into harbours, they pile up into walls of water 6 to 60 feet high. The Japanese call them "tsunamis", meaning "harbour waves", because they reach a sizable height only in harbours.
Tsunamis travel fairly slowly, at speeds up to 500 miles an hour. An adequate warning system is in use to warn all shores likely to be reached by the waves. But this only enables people to leave the threatened shores for higher ground. There is no way to stop the oncoming wave. [br] The significance of the slow speed of tsunamis is that people may
选项
A、notice them out at sea.
B、find ways to stop them.
C、be warned early enough.
D、develop warning systems.
答案
C
解析
文章最后一段提到,由于海啸移动比较缓慢,(警报系统)让人们得以离开受海啸威胁的地区并转移到高地上去,所以C为正确选项。此题容易误选D,海啸移动缓慢,使人们得以利用警报系统提前预报,但警报系统的开发本身并不是海啸移动缓慢的意义所在,所以D不正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3171904.html
相关试题推荐
Thecompanystipulatedthatthiscontract______fulfilledwithinonemonth.A、isB
Inthesentence"Rightsexistonlywithinasocialcontract,aspartofanexch
MostChinesepeoplewenttoworkbybikewithinliving______.A、mindB、knowledge
Afast-foodrestaurantwithinabout500feetofaschoolmayleadtoatleas
Thereductionof______UNpeace-keepingtroopswithin3monthsfromRwandaisa
Thereductionof______UNpeace-keepingtroopswithin3monthsfromRwandaisa
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Thereductionof______UNpeace-keepingtroopswithin4monthsfromRwandaisa
Thereductionof______UNpeace-keepingtroopswithin4monthsfromRwandaisa
随机试题
Whatdoesthespeakermean?[br][audioFiles]2020m2x/audio_etrktzm_011_202002[/
现行规范规定盲道的颜色为( )。A.中黄色 B.浅红色 C.橙黄色 D.
A.柴胡疏肝汤合少腹逐瘀汤加减 B.参苓白术散加减 C.痛泻要方加减 D.
关于做市商与经纪人的相同点和区别,下面的表述错误的是()。A.一般情况下,做市
对肝脏生物转化作用描述,不正确的是A.来自体内外的非营养物质在肝脏进行代谢转变的
与相应抗原结合易形成可见免疫复合物的动物免疫血清是A.人B.马C.家兔D.猴E.
A.△齐墩果烷结构 B.13β、28-环氧醚键结构 C.同环双烯结构 D.
下列属于行业生命周期中成熟期的特点的是()。A.竞争压力小,企业规模小
根据我国的政权结构,可以把我国的预算分为()。 A.6级B.3级C.4级
金属波纹管道进场时,应检查和检验的项目有()。A.出厂合格证和质量保证书
最新回复
(
0
)