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
Most earthquakes occur within the upper 15 miles of the earth’s surface. But earthquakes can and do occur at all depths to about
Most earthquakes occur within the upper 15 miles of the earth’s surface. But earthquakes can and do occur at all depths to about
admin
2013-06-17
54
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 erect 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 (地震的) sea waves, or tsunamis. These are often called tidal (海潮的) 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 harbors, they pile up into walls of water 6 to 60 feet high. The Japanese call them "tsunamis", meaning "harbor waves", because they reach a sizable height only in harbors.
Tsunamis (海啸) travel fairly slowly, at a speed of 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 waves.
The United Nations’ experts are supposed to______.
选项
A、construct strong buildings
B、put forward proposals
C、detect disastrous earthquakes
D、monitor earthquakes
答案
B
解析
见第三段"If followed, these suggestions will make disastrous earthquakes almost a thing of the past."可知专家是调查出原因,最后目的是给予合理的建议。
转载请注明原文地址:https://kaotiyun.com/show/iRM7777K
0
大学英语四级
相关试题推荐
SomepeopledescribeAmericansocietyasasaladbowlwhileothersseeitasameltingpot.Inasense,botharecorrectdependi
FreeSchoolMealsMillionsofAmericanschoolchildrenarereceivingfreeorlow-costmealsforthefirsttimeastheirparen
A、Hehasneverseenafossilthatold.B、Itcouldbemanymillionsofyearsold.C、Itisprobablyarecentspecimen.D、Hewilla
OneimportantcauseofthegenerationgapintheUSistheopportunitythatyoungpeoplehaveto【S1】______theirownlife-styles.
Insurancecompaniesprovideaservicetothecommunitybyprotectingitagainstexpectedandunexpecteddisasters.Beforeanins
Insurancecompaniesprovideaservicetothecommunitybyprotectingitagainstexpectedandunexpecteddisasters.Beforeanins
A、Mostchildrendonotreallystudyattheageoffivewhentheyenterkindergarten.B、MostAmericansdonotstarttoschoolat
Wehumanbeingsarelandanimals,butwearealsocloselytiedtothesea.Throughouthistory,theseahas【B1】______ourneeds.
Mostpeopleoftendreamatnight.Whentheywakeinthemorningtheysaytothemselves,"WhatastrangedreamIhad!Iwonderwh
Bloodisvitaltomaintainingastablebodytemperature;inhumans,bodytemperaturenormallyfluctuateswithinadegreeof37.0
随机试题
依据《普通高中美术课程标准(2017年版2020年修订)》中的“基本理念”,与“强调基础性和选择性”相搭配的是()。
简述工程招标的主要工作。
对单相全波整流X线机,下列说法正确的是
能水解可水解鞣质的物质是
《处方管理办法(试行)》规定,医师处方和药学专业技术人员调剂处方应当遵循的原则是()
在进行挖坑法厚度检测时,在选择试验地点时,需选一块()的平坦表面。
钢筋探测仪在进行混凝土内部钢筋探测前,应将探头放置于金属标准块上调零。()
以下不属于补偿原则相关规定的是()。
招股说明书全文文本的扉页应刊登的内容包括()。
甲公司是一家生产豆浆机的民营企业,设立于2010年,其企业愿景是将物美价廉的豆浆机摆进普通居民的厨房,让普通居民足不出户喝上新鲜香浓的豆浆。由于渣浆分离操作不便和内桶豆渣难以清理,豆浆机上市初期在市场上认同度较低,市场总体需求量不大,总体增长率偏
最新回复
(
0
)