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
A、Computer models are inadequate. B、Climate changes too quickly. C、Instruments for collecting field samples are not reliable. D、
A、Computer models are inadequate. B、Climate changes too quickly. C、Instruments for collecting field samples are not reliable. D、
admin
2015-07-16
77
问题
Today I want to talk about the Earth’s last major climatic shift, at the end of the last ice age.
But first, let’s back up a moment and review what we know about climatic change in general. First, we defined "climate" as consistent patterns of weather over significant periods of time.
In general, changes in climate occur when the energy balance of the Earth is disturbed. Solar emergy enters the Earth’s atmosphere as light and is radiated by the Earth’s surface as heat. Land, water, and ice each affect this energy exchange differently. The system is so complex that, to date, our best computer models are only crude approximations and are not sophisticated enough to test hypotheses about the causes of climatic change.
Of course, that doesn’t keep us from speculating. For instance, volcanic activity is one mechanism that might affect climatic change. When large volcanoes erupt, they disperse tons of particles into the upper atmosphere, where the particles then reflect light. Since less light is entering the system of energy exchange, the result would be a cooling of the Earth’s surface.
Of course, this is just one possible mechanism of global climate change. In all probability, a complete explanation would involve several different mechanisms operating at the same time.
10. How does the speaker begin her discussion?
11. What does the speaker mean by the phrase"the energy balance of the Earth?"
12. Why do meteorologists have difficulty testing hypotheses about climatic changes?
选项
A、Computer models are inadequate.
B、Climate changes too quickly.
C、Instruments for collecting field samples are not reliable.
D、Meteorologists cannot agree on key terms.
答案
A
解析
meteorologist:气象学者。地球能量交换是一个十分复杂的系统,即使是最先进的计算机模型也只是一个粗糙的近似值,不够先进,不能测试关于气候变化的假设,因此选A。选项B具有一定的迷惑性,要对气候变化的假说进行核实,是大的困难是气候的复杂性,而不是其变化的速度。
转载请注明原文地址:https://kaotiyun.com/show/M5Q7777K
0
大学英语六级
相关试题推荐
A、DonwellSchool.B、EnderbyHigh.C、CarltonAbbey.D、EnderbyComprehensive.C对话中男士和女士谈到了学业成就,男士说就大学升学率来说,EnderbyHigh表现不错,但Carlt
Children’sHealthcareofAtlantawantstomoveGeorgiaoutofthetop10listforchildhoodobesity(肥胖)by2016,officialssaid.
Children’sHealthcareofAtlantawantstomoveGeorgiaoutofthetop10listforchildhoodobesity(肥胖)by2016,officialssaid.
Asurgeingun-safetyclassesisoccurringasstatesrelaxlawsregardingcarryingguns.Agrowingnumberofpeople—manyof
Adayafterthemobilephonecelebratedits40thbirthday,Facebookhasproducedsomethingthatithopestomakecertainofthe
Ifyou’reoneofthosepeoplewhotendstoputonweightaroundyourmiddle,whatdoctorscallan"appleshape"—whattherestof
ReturningtoScienceA)TeresaGarrettwasworkingpart-timeasabiochemistrypostdoc(博士后).Shehadaninfantathome,andshew
A、Shewasself-contentedduetoherappearance.B、Shebulliedherclassmatesintopraisingher.C、Shecouldn’tfinishherhomewo
Everybodyloathesit,buteverybodydoesit.Arecentpollshowedthat40%ofAmericans【C1】______thepractice.InAmericaalone,
A、Itwasburneddown.B、Itwascloseddown.C、Itwasrobbed.D、Itwasblownup.C本题关键在于理解短语heldup“抢劫”的含义。男士话语中的Ihearditonth
随机试题
A.稳定肥大细胞膜B.阻断M受体C.抗炎、增加β2受体数量D.选择性激动β2受体E.促进肾上腺素释放氨茶碱的抗喘作用机制是()
用来证明论点的理由和根据是()
下列情况并存心绞痛,哪一种不宜用硝酸什油
A.用以消除或减缓君、臣药的毒性和烈性B.能引方中诸药以达病所的药物C.根据病情的需要,用与君药性味相反而又能在治疗中起相成作用的药物D.具有调和诸药作用的药物反佐药的含义是
藏医药学是民族优秀文化的瑰宝之一,也是我国传统医药的重要组成部分,藏医学以其独特的“三因学说”“人体七大物质”和“三种排泄物”为基础理论,在多个学科领域都有自己独特的建树。能消炎解毒、和胃至酸、化瘀止痛的藏成药是
具有浓郁气味,容易挥发的是容易产生酸败现象的是
背景:某学校食堂工程,建筑面积7000m2,框架结构,地上3层,外装饰为玻璃幕墙和石材,楼层之间安装有自动扶梯,在验收过程中发生了以下事件:事件一:幕墙分包工程施工完成后,内部自行组织了检查评定,为整体工程验收创造条件。事件二
甲企业委托乙企业生产无牌号卷烟20箱,甲企业向农业生产者收购烟叶,支付收购价4000元,需缴纳的烟叶税为880元。将该烟叶运送至乙企业,支付运输公司运费200元,乙企业收取5000元支票作为加工费和辅料费的合计金额,则乙企业应代收代缴甲企业的消费税为(
下列各行为主体不能作为纳税担保人的是( )。
ShoppersonBlackFriday,thetraditionalstartoftheholidayshoppingseasoninAmerica,arenotoriouslyaggressive.Someeven
最新回复
(
0
)