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
135
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.
What can be inferred from the passage?
选项
A、The climate of earth has fluctuated quite a hit over the last 4.6 billion years.
B、An increase in the earth’s temperature will have major consequences for all life on this planet.
C、The information we have got makes us unable to explain the global warming completely.
D、The Pleistocene began about 1.8 million years ago.
答案
C
解析
推断题。文章第六段第二句指出,我们(人类)在地球上的短暂历史和对气候更加简短的记载,不足以让我们完全了解地球升温的含义,由此可以推断,C正确。A、B、D项都是原文所述事实,不是推论所得,不符合题目要求。
转载请注明原文地址:https://kaotiyun.com/show/v967777K
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
"UnsolvedHistory"IfNASAengineersinventedatimemachinetomorrow,youcanbesurehistorianswouldbeshellingouttop
TelevisionhastransformedpoliticsintheUnitedStatesbychangingthewayinwhichinformationisdisseminated,byalteringp
A、Dotheassignmentstowardstheendofthesemester.B、Quitthehistorycourseandchooseanotheroneinstead.C、Droponecours
A、Shewantstoborrowtheman’sstudentIDcard.B、Theticketsarelessexpensivethansheexpected.C、Shewon’tbeabletoget
ThehomeserviceindustryinBeijingisexpectedtobecomemoreattractivebothasajobandasanindustry.Sourcesatthe
随机试题
Aworldwithoutmanagersisaniceidea.Butteamsneedleaders,irrespectiveofthequalityofthepeopleincharge.Someoneha
下列哪种病变愈合后会形成瘢痕
反映比较常见的行业市场劳动力供给状况的劳动力供给曲线的形状是()。
某厂购进一台加工设备,买价12万元,取得对方开具的增值税专用发票上注明的税金为2.04万元,另支付运杂费0.2万元、安装费0.3万元。根据我国《企业所得税暂行条例》及其实施细则的规定,该设备作为固定资产的计价金额应是()万元。
前一段时间,由于长江上游排放污染物致使武昌地区取水源受污染,影响数万居民正常用水,同时超市纯净水、矿泉水被哄抢一空。这一事件说明()。
最早从理论上对课堂教学加以阐述的教育著作是()。
人事争议是指事业单位与工作人员之间因除名、辞退、辞职、离职等解除人事关系以及履行聘用合同发生的争议。()
项目管理器中的“文本文件”组件包含在______选项卡中。
设有某函数的说明为:int*func(inta[10],intn):则下列叙述中,正确的是()。
ComparedwiththetotalnumberofBritain’sNationalHealthServicehospitals,thehospitalswhichhaveartcollectionsisonly
最新回复
(
0
)