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
Most of-us are used to seasons. Each year, spring follows winter, which follows au-tumn, which follows summer, which follows spr
Most of-us are used to seasons. Each year, spring follows winter, which follows au-tumn, which follows summer, which follows spr
admin
2011-01-14
45
问题
Most of-us are used to seasons. Each year, spring follows winter, which follows au-tumn, which follows summer, which follows spring. And winter is colder than summer.But the earth goes through temperature cycles over much longer periods than those that we experience. Between 65,000 and 35,000 years ago, the planet was much colder than it is now. During that time the temperature also changed a lot, with periods of warming and cooling. Ice melted during the warm periods, which made sea levels rise. Water froze again during the cold periods.
A new study from Switzerland sheds light on where ice sheets melted during the ice age.
It now seems that the ice melted at both ends of the earth, rather than just in ei-ther northern or southern regions.
This surprised the researchers from the University of Bern.
Scientists have long assumed that most of the ice that melted was in the Northern hemisphere (半球) during the 30,000-year long ice age.
That belief was held because the North Pole is surrounded by land, while the South Pole is surrounded by the Antarctic Ocean. It is easier for ice sheets to grow on land. If surrounded by sea the ice can easily just slip into the ocean instead of building up.
The researchers used a computer model to look at ways the ice could melt and how it might affect sea levels. They compared these results to evidence of how temperatures and currents actually changed during that time. The model showed that if it was only in the Northern hemisphere that ice melted, there would have been a bigger impact (影响) on ocean currents (洋流) and sea temperatures than what actually happened. Studies suggest that melting just in the Southern hemisphere would have been impossible, too. The only reasonable conclusion, the scientists could make, was that ice melted equally in the North and the South.
It is still a mystery as to what caused the temperature changes that caused the ice to melt.
Between 65,000 and 35,000 years ago, ______.
选项
A、the temperature changed a lot
B、the earth was much warmer than it is now
C、winter isn’t colder than summer
D、most of the ice that melted was in the Northern hemisphere during the 30,000-year long ice age
答案
A
解析
细节题。根据Between 65,000 and 35,000 years ago,the planet was much colder than it is now.During that time the temperature also changed a lot,with peri-ods of warming and cooling.可知答案为A。
转载请注明原文地址:https://kaotiyun.com/show/F8JO777K
0
成人本科学位英语
相关试题推荐
ThreeEnglishdictionariespublishedrecentlyalllayclaimtopossessinga"new"feature.TheBBCEnglishDictionarycontainsb
Americaisthelandoftheautomobile.Thiscountryhasonly6percentoftheworld’spopulationoutof46percentoftheworld’
Forseveralyears,scientistshavebeentestingasubstancecalledinterferon,apotentialwonderdrugthatisprovingtobeeff
Thequestionsofwhetherwarisinevitableisonewhichhasconcernedmanyoftheworld’sgreatwriters.Beforeconsideringthis
Treesareusefultomaninthreeveryimportantways:theyprovidehimwithwoodandotherproducts;theygivehimshade;theyh
Whenaconsumerfindsthatanitemsheorheboughtisfaultyorinsomeotherwaydoesnotliveuptothemanufacturer’sclaim
Whenaconsumerfindsthatanitemsheorheboughtisfaultyorinsomeotherwaydoesnotliveuptothemanufacturer’sclaim
Duringrecentyearswehaveheardmuchabout"race":howthisracedoescertainthingsandthatracebelievescertainthingsand
Theoldcoupledecidedto______aboyandagirlthoughtheyhadthreeoftheirown.
ffyoudon’tputthemilkintherefrigerator,itmay________
随机试题
商业银行的主要业务不包括()。
投标人以他人名义投标或者以其他方式弄虚作假,骗取中标的,情节严重的,取消其( )投标资格,并予以公告,直至由工商行政管理机关吊销营业执照。
水泥合格证分为()几种。
在下列各项中,属于财务报表列报构成内容的有()。
角色扮演过程包括()。
目前,“金砖四国”的经济总量大致是美国的一半,在全球金融风暴的当下,虽然经济也遭受影响,但“金砖四国”的实力仍令世界刮目相看,“金砖四国”是指()。
S3C2410采用AHB总线和APB总线构建片上系统。芯片内部的USB设备接口与【61】总线相连,芯片内部的USB主控制器接口与【62】总线相连。
计算机采用【】工作原理。
Therearemoredrugsdispensedforpainthanforanyotherdiseaseonthisplanet.Drugcompaniesenjoyearninghugeprofitsf
Itisgenerallyacknowledgedthatyoungpeoplefrompoorersocioeconomicbackgroundstendtodolesswellinoureducationsyste
最新回复
(
0
)