首页
登录
职称英语
Since ancient times volcanoes have struck terror and wonder into the heart o
Since ancient times volcanoes have struck terror and wonder into the heart o
游客
2023-09-11
44
管理
问题
Since ancient times volcanoes have struck terror and wonder into the heart of man. Yet there is much more to volcanic activity than the spectacular and awe-inspiring eruptions which sometimes cause great destruction. Comparatively few volcanoes are really dangerous and many of them are merely "noisy neighbors" to those who live nearby, causing only a slight nuisance. The share of good which volcanic force has brought to the world has too often been obscured by the violent outbursts of a few highly active ones.
In recent geological times, volcanoes have thrown up a multitude of islands dotted among the oceans and seas of the world which have added some hundreds of square miles to the land surface of the earth. Their real value to man, however, lies in the widely varying use to which they can be put. On the continental land masses volcanoes have raised mountains which have done much to increase what would otherwise have been a scanty rainfall. And the peoples of the tropics often have a lofty volcanic cone to thank for a more temperate climate.
The greatest benefit so far brought by volcanoes, however, has been the fertilizing effect of the lava and ash they eject. The soils formed by the decay of these volcanic products yield rich harvests in many countries. This fertility accounts for the amazing density of population in the neighborhood of many active craters. Forgetful of past catastrophes and heedless of the dangers that still threatens them, farmers have settled in large numbers round Etna and Vesuvius and volcanoes in Central America, Indonesia, the Philippines, and Japan, but they now run fewer risks than their forefathers. In the past few decades observation posts have been set up alongside the most dangerous craters, so that all impending eruption can be detected and warning given in good time.
For a long while no attempt was made to harness the enormous power generated by volcanoes. Even in quite subsidiary forms it was put only to such domestic use as heating and cooking, or was employed therapeutically in the form of hot mineral springs. Today the remarkable technical achievements of Iceland and Italy are serving as a spur to the harnessing of geothermal power for use in industry. In a few years’ time, other countries, particularly those with few other sources of natural power, are likely to be drawing more and more on the inexhaustible power 35 offered by volcanoes. [br] Observation posts have been set up alongside the most dangerous craters to ______.
选项
答案
to detect and warn people of imminent eruptions
解析
“observation posts”在第三段最后一句中有所提及,句中的“so that”引导目的状语从句,正好是答案。但文中的被动语态句如何转换成主动词组来答题,可能有些难度。
转载请注明原文地址:http://tihaiku.com/zcyy/3003871.html
相关试题推荐
[originaltext]M:Excuseme.Iwonderifyoucouldhelpme.Thereferencelibrar
[originaltext]M:Excuseme.Iwonderifyoucouldhelpme.Thereferencelibrar
[originaltext]M:Excuseme.Iwonderifyoucouldhelpme.Thereferencelibrar
SomassivewastheunderseaearthquakethatstruckneartheIndonesianislan
SomassivewastheunderseaearthquakethatstruckneartheIndonesianislan
SomassivewastheunderseaearthquakethatstruckneartheIndonesianislan
SomassivewastheunderseaearthquakethatstruckneartheIndonesianislan
[originaltext]W:Hi,Sam,IhatetobotheryoubutIwonderifIcouldhaveaw
[originaltext]W:Hi,Sam,IhatetobotheryoubutIwonderifIcouldhaveaw
AncientOlympicGamesAmateurathletesf
随机试题
TheUnitedStateshasamajorracialproblemonitshands.True,Britainisf
按压缩气体种类和用途的不同分类,螺杆式压缩机不包括()。A.空气压缩机 B
2010年,我国进出口贸易总额29728亿美元,同比增长34.7%,其中,出口
( )是绩效考评要素选择的前提和基础。A.工作岗位分析 B.工作岗位评价
烟花爆竹的组成决定了它具有燃烧和爆炸的特性。燃烧是可燃物质发生强烈的氧化还原反应
采用这种材料,可以减少热损失,降低燃料消耗,建波炉墙厚度,降低工程造价,缩短窑炉
某技术方案设计年生产能力为100万件,每件售价90元,固定成本每年800万元,变
某大型引调水工程位于Q省x市,第5标段河道长10km。主要工程内容包括河道开挖、
电气照明灯具的施工程序中,灯具组装的紧后工序是()。A.灯具安装接线 B.灯
关于建筑工业化主要标志的说法,正确的有()。A.建筑设计标准化 B.构配
最新回复
(
0
)