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
2024-02-13
14
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 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. [br] Which of the following CANNOT be concluded from the passage?
选项
A、The number of earthquakes is closely related to depth.
B、Roughly the number of earthquakes varies much every year.
C、Earthquakes are most likely to occur within the upper 15 miles of the earth’s surface.
D、Earthquakes are most likely to occur near the surfaces.
答案
B
解析
but the yearly average does not vary much."可见每年的平均地震次数不会有太大变化。
转载请注明原文地址:https://tihaiku.com/zcyy/3446114.html
相关试题推荐
Earthquakesmayrightlyberankedasoneofthemostdevastatingforcesknow
Earthquakesmayrightlyberankedasoneofthemostdevastatingforcesknow
Earthquakesmayrightlyberankedasoneofthemostdevastatingforcesknow
Earthquakesmayrightlyberankedasoneofthemostdevastatingforcesknow
WithinfifteenyearsBritainandothernationsshouldbewellonwiththebu
WithinfifteenyearsBritainandothernationsshouldbewellonwiththebu
WithinfifteenyearsBritainandothernationsshouldbewellonwiththebu
WithinfifteenyearsBritainandothernationsshouldbewellonwiththebu
Todayscientistsknowsomethingaboutthecausesofearthquakes.[br]Earthquake
Todayscientistsknowsomethingaboutthecausesofearthquakes.[br]Thepassag
随机试题
[originaltext]W:WereyouinLondontwoyearsago.Mr.Jacobs?M:No.Iwasin
我国中原地区某小山丘周围要布置一组住宅群,现有平面示意的A、B、C、D四个场地可
下列不属于预防医学特点的是A.工作对象包括个体及确定的群体 B.更重视保障和促
LED可变信息标志是目前高速公路应用最为广泛的可变标志,其对应的产品标准为GB/
知觉的基本特性有:A.知觉的相对性 B.知觉的整体性 C.知觉的理解性 D
A.活血化瘀,通络止痛 B.散寒宣痹,芳香温通 C.豁痰活血,理气止痛 D
存在于血浆的凝血因子下列哪项是错误的A.因子ⅩⅢB.因子ⅢC.因子ⅦD.因子ⅤE
意外利润指企业由于外界条件的变化,而并非因为本身经营有方所获得的利润,相比额外利
孟禄认为“全部教育都归之于儿童对成人的无意识模仿”,这种观点是教育起源说中的(
2003-98.沉涩脉的主病是 A.血瘀B.脾肾阳虚,水湿停留 C.二
最新回复
(
0
)