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 planet’s history and it can be expected t
The climate of earth has fluctuated quite a bit over the last 4.6 billion years of our planet’s history and it can be expected t
admin
2013-06-02
68
问题
The climate of earth has fluctuated quite a bit over the last 4.6 billion years of our planet’s 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 arc 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 post- glacial 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 mount 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.
Which of the following statements is TRUE according to the passage?
选项
A、96 percent of the earth’s surface is covered by ice.
B、Over 10 million square miles of the earth’s surface are covered by ice now.
C、Almost all of the ice sheets coveting the land and glaciers in the mountains have been hidden.
D、Most of the ice on the earth’s surface is located in Antarctic and Greenland for the time being.
答案
D
解析
细节题。文章第三段倒数第二句指出,如今地球表面的10%被冰覆盖,其中的96%分布在南极洲和格陵兰岛,所以D正确。
转载请注明原文地址:https://kaotiyun.com/show/l967777K
0
大学英语六级
相关试题推荐
IntheUnitedStates,itisrequiredthatallchildrenattendschool,publicorprivate,fortwelveyears.Thereare【B1】______t
IntheUnitedStates,itisrequiredthatallchildrenattendschool,publicorprivate,fortwelveyears.Thereare【B1】______t
IntheUnitedStates,itisrequiredthatallchildrenattendschool,publicorprivate,fortwelveyears.Thereare【B1】______t
A、NewYorkCity.B、SomewhereintheUnitedStatesC、SomewhereotherthantheUnitedStates.D、SomewhereotherthanAsia.CWhere
"UnsolvedHistory"IfNASAengineersinventedatimemachinetomorrow,youcanbesurehistorianswouldbeshellingouttop
A、Businessclass.B、Historyclass.C、Mathematicsclass.D、None.B本题问“Al害怕什么课?”文中提到Lily认为商贸课程使她倍受煎熬,而All也深有同感,说自己对文科感觉也是如此。而只有历
TelevisionhastransformedpoliticsintheUnitedStatesbychangingthewayinwhichinformationisdisseminated,byalteringp
TelevisionhastransformedpoliticsintheUnitedStatesbychangingthewayinwhichinformationisdisseminated,byalteringp
ThehomeserviceindustryinBeijingisexpectedtobecomemoreattractivebothasajobandasanindustry.Sourcesatthe
随机试题
女,20岁。四肢无力3天,视物不清1天。1周前有腹泻,持续1天即愈。体检:意识清楚,双眼向两侧注视均轻度受限,露白约2.5mm。四肢肌力4级,腱反射近乎消失,指鼻试验不准,跟膝腱试验欠稳,深浅感觉存在,病理反射阴性。该患者最可能是
补中益气汤主治证的病机是
背景某矿井采用立井开拓方式,风井位于井田东部边界,主井装载系统位于副井运输水平上方,主、副井井筒深度基本相同,副井井底车场主要巷道及硐室布置如图1所示。矿井施工组织安排主井先于副井3个月开工,箕斗装载硐室与主井井筒同时施工,主、副井同时到底;短路贯通后,
股票市场上有一支股票的价格是每股30元,已知发行该股票的公司在该年度净利润为1000万元,销售收入总额为10000万元,未分配利润为3000万元,该公司的股本数额为1000万股。该股票的市盈率为( )。
一般资料:女,28岁,未婚,公司职员。下面是一段心理咨询师与求助者的对话:心理咨询师:你好,请坐。你希望在哪方面得到我们的帮助?求助者:……心理咨询师:你可以放心地说,我们今天所有的谈话都是保密的。求助者:
【2013.四川内江】素质教育的重点是培养学生的解决问题的综合能力。()
材料1:某校8月中旬下达任务组织人员到西藏支教,需要7个人员,但是以往出现有一些人不合格,有些人去了呆不久的情况,9月初要完成相关工作,张明是学校支教负责人。材料2:介绍要去支教的某县的基本情况:设备落后,师资缺乏,但是相关领导非常重视相关工作,
根据下图回答下面问题2003—2007年某省生产总值(亿元)
Thissummer,forthefirsttime,EmoryCollegeletfreshmenpicktheirownroommatesinanonlineroommate-selectionsystemthat
地址编号从80000H到BFFFFH且按字节编址的内存容量为(1)KB,若用16K×4bit的存储器芯片构成该内存,共需多少(2)片。(1)
最新回复
(
0
)