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
The climate of earth has fluctuated quite a bit over the last 4.6 billion years of our planers history and it can be expected th
The climate of earth has fluctuated quite a bit over the last 4.6 billion years of our planers history and it can be expected th
admin
2013-06-02
29
问题
The climate of earth has fluctuated quite a bit over the last 4.6 billion years of our planers history and it can be expected that the climate will continue to change. One of the most intriguing questions in earth science is whether the periods of ice ages are over or are we living in an "interglacial" period of time between ice ages?
The geologic time period we are now living in is known as the Holocene(全新世). This epoch began about 11,000 years ago which was the end of the last glacial period and the end of the Pleistocene (更新世) epoch. The Pleistocene was an epoch of cool glacial and warmer interglacial periods which began about 1.8 million years ago.
Since the glacial period known as the "Wisconsin" in North America and "Wrm" in Europe when over 10 million square miles (about 27 million km2) of North America, Asia, and Europe were covered by ice, almost all of the ice sheets covering the land and glaciers in the mountains have retreated. Today, about ten percent of the earth’s surface is covered by ice; 96% of this ice is located in Antarctica and Greenland. Glacial ice is also present in such diverse places as Alaska, Canada, New Zealand, Asia, and California.
As only 11,000 years has passed since the last Ice Age, scientists can not be certain that we are indeed living in a postglacial Holocene epoch instead of an interglacial period of the Pleistocene and thus due for another ice age in the geologic future. Some scientists believe that an increase in global temperature, as we are now experiencing, could be a sign of an impending ice age and could actually increase the amount of ice on the earth’s surface.
The cold, dry air above the Arctic and Antarctica carries little moisture and drops little snow on the regions. An increase in global temperature could increase the amount of moisture in the air and increase the amount of snowfall. After years of more snowfall than melting, the Polar Regions could accumulate more ice.
An accumulation of ice would lead to a lowering of the level of the oceans and there would be further, unanticipated changes in the global climate system as well. Our short history on earth and our shorter record of the climate keeps us from fully understanding the implications of global warming. Without a doubt, an increase in the earth’s temperature will have major consequences for all life on this planet.
What’s the result of an accumulation of ice?
选项
A、An accumulation of ice would make the global climate system altered.
B、An accumulation of ice would make snow more difficult to melt.
C、An accumulation of ice would increase the amount of moisture in the air.
D、An accumulation of ice would increase the global temperature.
答案
A
解析
细节题。由文章第六段第一句可知,冰的堆积可能改变全球气候系统,所以A正确。
转载请注明原文地址:https://kaotiyun.com/show/y0B7777K
0
大学英语六级
相关试题推荐
Barter(以货易货),theexchangeofgoodsandserviceswithouttheuseofmoney,isnotanewidea,butoverthepastdecade,thisty
A、Theanimalsinthenextdoor.B、Theweathertoday.C、Thetemperatureintheroom.D、Thenewrefrigerator.C综合理解题。男士提到女士的房间如同冰箱
A、Putinanotheronedollar.B、Strikethemachine.C、Concentrateonthework.D、Eatsomethingbeforework.B请求建议题。女士抱怨机器又吞掉了自己一美
A、Anxious.B、Confident.C、Afraid.D、Excited.A观点态度题。女士说对于面试她感到非常担忧,她太需要这份工作了,不能出任何差错。由此可知,女士感到很担忧。inaflap意为“慌乱,激动,焦急”。
ShouldGraduatesSpendMuchonJobHunting?1.目前大学生在求职上花的钱越来越多2.人们对此看法不一3.我的看法
Forthispart,youarerequiredtowriteacompositiononthetopic"The1998SummerFlood".Youshouldwriteatleast150words
A、Thewomancanpayeitherperson.B、Thewomanshouldbuytheonesheprefers.C、Helikesthesameonethatthewomandoes.D、He
Ahappymarriageapparentlyisgoodmedicine,buthostilespousesmaybeharmfultooneanother’shealth.Couplesin【B1】_____m
A、Itisextremelydangeroustoflyinthedark.B、Noiseregulationsrestrictthehoursofairportoperation.C、Someofitsrunwa
随机试题
A.癌前病变B.恶性肿瘤C.良性肿瘤D.交界性肿瘤黑色素瘤属于
能使糜蛋白酶原活化的物质主要是
下列不适于心理治疗的是
因发生事故或者其他突然性事件,造成或者可能造成污染事故的单位,必须立即采取措施处理,及时通报(),并向当地环境保护行政主管部门和有关部门报告,接受调查处理。
股份有限公司依法向100人的特定对象发行证券属于公开发行证券。()
要实现人的全面发展,必须正确处理的三个关系是()。
中国工商银行
有如下C语言程序void*th_f(void*arg){printf("HelloWorld");pthread_yield(0);}intmain(void){pthread_ttid;
AccordingtotheFBI,howmanyrobberiesweresolvedbythepolicelastyearintermsofpercentage?
______isNOTlookeduponasoneofthefeaturesofRenaissance.
最新回复
(
0
)