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
62
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.
We can infer from the passage ______.
选项
A、the ice can easily just slip into the ocean
B、volcanoes caused the ice to melt
C、melting just in the Northern hemisphere would have been impossible
D、researchers often use the computer models help their research work
答案
C
解析
推理判断题。根据第四段最后两句Studies suggest that melting just in the Southern hemisphere would have been impossible,too.The only reasonable conclu-sion…可知冰川既不可能只在南半球融化,也不可能只在北半球融化。故答案为C。
转载请注明原文地址:https://kaotiyun.com/show/H8JO777K
0
成人本科学位英语
相关试题推荐
NancyJeschke’ssleepingdifficultiesbeganonvacationafewsummersago.Sheblamedthenoisymotelroom,buthersleepingdid
Treesareusefultomaninthreeveryimportantways:theyprovidehimwithwoodandotherproducts;theygivehimshade;theyh
Moresurprising,perhaps,thanthecurrentdifficultiesoftraditionalmarriageisthefactthatmarriageitselfisaliveandth
Thegreatestrecentsocialchangeshavebeeninthelivesofwomen.Duringthetwentiethcenturytherehasbeenaremarkablesho
Thenorthernandsouthernpolarregionsaredifferentinmanyways.Themostimportantdifferenceconcernsthedistributionofl
Ifwomenaremercilesslyexploitedyearafteryear,theyhaveonlythemselvestoblame.Becausetheytrembleatthethoughtofb
TheeconomyoftheUnitedStatesafter1952wastheeconomyofawell-fed,almostfullyemployedpeople.Despiteoccasionalalar
HethoughthecouldtalkMr.Robinson______buyingsomeexpensiveequipments.
Man:DoyoumindifIturnthetelevisionoff?Woman:I’minthemiddleofwatchingaprogram.Question:Whatcanbeinferredfr
Therewerenotickets______forSunday’sperformance.
随机试题
什么叫电弧静特性?什么叫电源的外特性?
惊厥持续状态是指
某男性工人,接尘工龄18年,诊断一期石棉肺半年,主诉轻度运动后即感呼吸困难,体温正常,无明显咳痰。如进行肺通气功能检查,其特征性改变是()
乳房纤维瘤的发生与下列哪项因素有关
施工机械使用费的索赔包括()。
下列属于申请电子报检的报检企业应具备的条件的有( );
计算VaR值的方差一协方差的方法不适用于计量期权的市场风险,其主要原因为()。
简述记忆的SPI理论。
物理意义上的自然物要成为法律关系客体,必须具备的特征是()。
(1)Afterthirtyyearsofmarriedhappiness,hecouldstillremindhimselfthatVictoriawasendowedwitheverycharmexceptthe
最新回复
(
0
)