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
85
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
A、Suggestatopicforaresearchpaper.B、Tellherwhattostudyforthehistorytest.C、Writeafavorableletterofrecommendat
A、Thehumanbeingswilldieoutin2094.B、Animalscouldnotliveinthecoldclimate.C、TheEarthcouldbehitbyotherobjects
IntheUnitedStates,itisrequiredthatallchildrenattendschool,publicorprivate,fortwelveyears.Thereare【B1】______t
IntheUnitedStates,itisrequiredthatallchildrenattendschool,publicorprivate,fortwelveyears.Thereare【B1】______t
A、Theartist’sworksarebeyondunderstanding.B、Theartist’sunexpectedtragedyisagreatpity.C、Theartist’spaintingsarea
A、Thewomanwouldenjoyreadingamystery.B、Heisn’tinterestedinreading.C、Heneedssomethingtoread,too.D、Historybooks
TelevisionhastransformedpoliticsintheUnitedStatesbychangingthewayinwhichinformationisdisseminated,byalteringp
TelevisionhastransformedpoliticsintheUnitedStatesbychangingthewayinwhichinformationisdisseminated,byalteringp
ThehomeserviceindustryinBeijingisexpectedtobecomemoreattractivebothasajobandasanindustry.Sourcesatthe
随机试题
Myfatherwasforemanofasugar-caneplantationinRiopiedras,puertoRico.Myfirstjobwastodrivetheoxenthatplowedthe
男性,46岁,有胃溃疡病史10年,近3个月上腹痛加重,食欲减退。间歇服用碱性抗酸药症状未能缓解而来住院。大便隐血阳性。胃镜下见胃窦部一大溃疡,约2.0cm×2.5cm,底部污秽苔,边缘结节状隆起,蠕动差。应拟诊为
由下述热力常数K数据,计算各化学键的振动频率(波数)。(1)乙烷的C—H键,K=5.1N/cm;(2)乙炔的C—H键,K=5.1N/cm;(3)苯的C—C键,K=7.6N/cm;(4)甲醛的C=O键,K=12.3N/cm。由所得
异位ACTH综合征第二型的特点,下列错误的是
建筑围护结构的热工性能权衡判断,是对比设计建筑和参照建筑的下列哪项内容?
宣告中国共产党诞生的历史事件是()。
习近平同志指出:“要坚持走中国特色社会主义文化发展道路,弘扬社会主义先进文化,推动社会主义文化大发展大繁荣,不断丰富人民精神境界,增强人民精神力量,努力建设社会主义文化强国。”事关文化改革发展全局的根本问题是()。
建设中国特色社会主义是现阶段我国得各族人民共同的理想信念,它的基本内容有
办公信息系统一般由三个部分组成,分别是办公制度和规程、办公设备和【】。
Doyouwakeupeverydayfeelingtootired,orevenupset?Ifso,thenanewalarmclockcouldbejustforyou.Theclock,c
最新回复
(
0
)