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、The West Antarctic region was once an open ocean. B、The West Antarctic ice sheet was about 7, 000 feet thick. C、The West Antar
A、The West Antarctic region was once an open ocean. B、The West Antarctic ice sheet was about 7, 000 feet thick. C、The West Antar
admin
2011-01-10
53
问题
Among global warming’s most frightening threats is the prediction that the polar ice-caps will melt, raising sea level so much that coastal cities from New York to Los Angles to Shanghai will be flooded.
Scientists agree that key player in this scenario is the West Antarctic ice sheet, a Brazil-size mass of frozen water that is as much as 7, 000 feet thick. Unlike floating ice shelves which have little impact on sea level when they break up, the ice sheet is anchored to bedrock well blow the sea surface. Surrounded by open ocean, it is also vulnerable, but Antarctic experts disagree strongly on just how unstable it is.
Now, new evidence reveals that all or most of the west Antarctic ice sheet collapsed at least once during the past 1. 3 million years, a period when global temperatures probably were not significantly higher than they are today. And the ice sheet was assumed to have been stable. In geological time, a million years is recent history. The proof, which was published last week in Science, comes from a team of scientists from Uppsala University in Sweden and the California Institute of Technology who drilled deep holes near the edge of the ice sheet. Within samples collected from the solid substance lying beneath the ice,they found fossils of microscopic marine plants which suggest that the region was once an open ocean, not solid ice. As Herman Englehart, a co-author from the California Institute of Technology says, "the West Antarctic ice sheet disappeared once, and can disappear again. "
26. Q: What is one of the most frightening threats of global warming according to the passage?
27. Q:What did scientists disagree on?
28. Q:What does the latest information reveal about the West Antarctic ice sheet?
29. Q:What does the scientists’ latest finding suggest?
选项
A、The West Antarctic region was once an open ocean.
B、The West Antarctic ice sheet was about 7, 000 feet thick.
C、The West Antarctic ice sheet was once floating ice.
D、The West Antarctic region used to be warmer than today.
答案
A
解析
科学家在冰层下的固体物质中发现了微小的海洋植物的化石,这说明该地区曾是海洋。
转载请注明原文地址:https://jikaoti.com/ti/jFZFFFFM
0
大学英语六级
相关试题推荐
Earthquakesareprobablyoneofthemostfrighteninganddestructivehappeningsofnaturethatmanexperiences.Theyhavecaused
A、Hehastochangethetopicforhiscomposition.B、HehasfallenbehindothersinEnglishclass.C、Hehasn’tmadeuphisminda
A、Whatchemicalstearsarecomposedof.B、Whethercryingreallyhelpsusfeelbetter.C、Whysomepeopletendtocrymoreoftent
TheWorldTradeOrganizationwasestablishedin1995.It【B1】______outoftheGeneralAgreementonTariffsandTradeorGATT.GA
Millionsofyoungpeoplearecreatingblogs.Millionsofothersarereadingthem.Theword"blog"isashortwayofsayingWebl
Eachautumn,teachersspendmanyhourswritingreferencesinsupportoftheirpupils’universityapplications,anduniversityad
Asawisemanoncesaid,weareallultimatelyalone.ButanincreasingnumberofEuropeansarechoosingtobesoataneverear
A、Thewomanistheman’sboss.B、Themanisthewoman’shusband.C、Thewomanistheteacherofthechild.D、Thewomanwantstok
A、Fortyhours.B、Lessthanfortyhours.C、Aboutseventyhours.D、Lessthantwenty-fivehours.B事实细节题。目前美国人的工作时间是每周少于40小时(1esstha
"I’vebeenshotintheleg.I’vebeenbeatup.Butthat’sprettyminor,"saysa41,year-oldAmericansecuritycontractorwhosp
随机试题
患者,男,25岁。突起畏寒发热1天,伴咳嗽,右胸痛,痰带铁锈色,来院前自服APC一片,服药后出汗较多。查:体温40℃,血压11.5/7.2kPa(86/54mmHg),右上胸语颤增强,管状呼吸音,白细胞26.2×109/L,X线示右上肺大片致密阴影,诊
影响栓剂吸收的因素是()
(2009年考试真题)W股份有限公司2008年有关资料如下:(1)1月1日部分总账及其所属明细账余额如表2—1—1所示:注:①该公未单独设置“预付账款”会计科目。②表中长期借款为2007年10月1日从银行借入,借款期限2年,年利率5%,每年付息一次。
甲公司为小规模纳税企业,当月销售体育用品一批,含税价格为412万元,增值税征收率为3%,该批商品应缴纳的增值税为()万元。
贯彻理论联系实际的原则的基本要求是()。(2014.广东)
将一个班80位同学的成绩进行排名(排名不含并列名次),在不知道各位同学名次的前提下先后随机点4位同学的名字,问这4位先后点名的同学的成绩排名越来越好的概率是多少?()
胡某为杀人而与沈某商量并委托沈某购买毒药,沈某果然为其买来了毒药。但一周后胡某放弃了杀人意图,将毒药焚毁。则下列表述止确的是()。
Dinosaurswerereptileswhichbecameextinctabout65millionyearsago.Themostintriguingquestionaboutdinosaurshasalways
Directions:Thereare10questionsinthispartofthetest.Readthepassagethrough.Then,gobackandchooseonesuitablewor
Foraboutthreecenturieswehavebeendoingscience,tryingscienceout,usingsciencefortheconstructionofwhatwecallmod
最新回复
(
0
)