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
In the United States the science of climate change still remains a controversial issue. Part of the problem is that it is comple
In the United States the science of climate change still remains a controversial issue. Part of the problem is that it is comple
admin
2009-04-23
39
问题
In the United States the science of climate change still remains a controversial issue. Part of the problem is that it is complex and hard to isolate its parts. We do know how vital it is to life. The atmosphere forms a gaseous, protective envelope around earth protecting the earth from the cold of space, from harmful ultraviolet light, and from all but the largest meteors. After traveling over 93 million miles, solar energy strikes the atmosphere and earth’s surface, warming the planet and creating what is known as the "biosphere" which is the region of earth capable of sustaining life. Atmospheric circulation is one important reason that life on earth can exist at higher latitudes because equatorial heat is transported poleward, moderating the climate.
The atmosphere is not just a protector but also a great transporter. The transport of water vapor in the atmosphere is an important mechanism by which heat energy is redistributed poleward. Heat energy absorbed at the equator is deposited at the poles and the temperature gradient between these regions is reduced. The circulation of the atmosphere and the weather it generates is but one example of the many complex, interdependent events of nature. The web of life depends on the proper functioning of these natural mechanisms for its continued existence.
Some argue that climate change is too complicated to be attributed only to human activity. For example, fossil studies of radiolaria, a group of one-celled animals characterized by silicon-containing shells, have given scientists a fairly accurate account of climatic conditions in the distant past. Geologists found these 450, 000-year-old microorganisms preserved in cores of sediment taken beneath the floor of the Indian Ocean. They provide a record of cycles of climatic changes, determined by the alternating layers of species of warm and cold-preferring radiolaria. We now have confirmation that changes in the earth’s orbital geometry caused the ice ages.
This does not let us off the hook because although we can hardly alter the basic forces at work that alter climate, even small contributions by humans can have dramatic effects. Given nature’s interconnectedness, it is possible that the most serious threats have yet to be recognized.
选项
A、sheltering effect
B、reviving effect
C、invigorating effect
D、cleansing effect
答案
A
解析
主旨思想题,考查第一段的内容概括。第一段主要介绍大气层是地球的保护者。
转载请注明原文地址:https://kaotiyun.com/show/I637777K
0
大学英语四级
相关试题推荐
RisksforYouthsWhoEatWhatTheyWatchA)Manyfactorsinfluencechildren’sfoodchoices;wheretheyeat;whattheirfrien
RisksforYouthsWhoEatWhatTheyWatchA)Manyfactorsinfluencechildren’sfoodchoices;wheretheyeat;whattheirfrien
Executivemanagers’payisstilldeterminedbysimplisticmeasuresofperformancethatbearlittlerelationtolong-termdrivers
SinceWorldWarII,allnationsoftheworldhaveshownagreatinterestineconomicgrowth.Mostofthemhaveshownapercentag
SinceWorldWarII,allnationsoftheworldhaveshownagreatinterestineconomicgrowth.Mostofthemhaveshownapercentag
Anew,theoreticalanalysisfindsthatabouthalfoftheriskfactorsforAlzheimer’sdisease(老年痴呆症)arepotentiallychangeable
Whyfactsdon’tchangeourmindsA)TheeconomistJ.K.Galbraithoncewrote,"Facedwithachoicebetweenchangingone’smi
A、Theresearchisabouttherelationshipbetweenreadinghabitsandage.B、Theresearchisconductedby3trainedprimaryschool
A、Analternativeuseoffueloil.B、Awaytomakefueloillesspolluting.C、Anewmethodforlocatingundergroundoil.D、Anew
随机试题
下列排序方法中,最坏情况下比较次数最少的是
简要回答如何利用需求价格弹性原理分析垄断的情况。
吗啡有镇痛、镇静和兴奋呼吸的作用。
诊断肺脓肿最主要的依据是
制备缓释固体分散体的脂质类材料为()
A.杏苏散B.清燥救肺汤C.桑杏汤D.麦门冬汤E.养阴清肺汤含有半夏、麦冬、人参的方剂是
总平面图中的标高指的是()。
FIDIC条款中,下列()对合同没有解释权。
放坡基坑施工中,当边坡有失稳迹象时,应及时采取()或其他有效措施。
20×2年11月,薛某将其自有的房屋无偿赠与其外孙女杨某,则杨某应按规定缴纳个人所得税。()
最新回复
(
0
)