首页
登录
职称英语
Most of-us are used to seasons. Each year, spring follows winter, which fol
Most of-us are used to seasons. Each year, spring follows winter, which fol
游客
2025-03-14
30
管理
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. [br] Which of the following is the best title for the passage?
选项
A、A computer model
B、Studies show ice melted equally in the North and the South during the ice age
C、Most of the ice melted in the Northern hemisphere during the 30,000-year long ice age
D、A survey result
答案
B
解析
主旨大意题。根据主题句ice melted equally in the North and the South可知本文主要讲的一个新的科学发现:冰川时期的冰川I融化是在南北极均匀进行的。
转载请注明原文地址:https://tihaiku.com/zcyy/3997404.html
相关试题推荐
SpeakerA:Doyouthinktheweathernextwinterwillbebetterthanthiswinter?
IntheSpringExportCommoditiesFairthe______offinechinaattractedmuchatte
Theywillgohomeforwintervacationassoonasthey______theirexams.A、have
Inwinter,animalshaveahardtime______anythingtoeat.A、tofindB、tofindin
Onereasonmaybethatinspringman’smentalabilitiesareaffectedbythesame
【B1】[br]【B3】A、infollowB、infollowingC、asfollowsD、asfollowingCasfollows
Mostof-usareusedtoseasons.Eachyear,springfollowswinter,whichfol
Mostof-usareusedtoseasons.Eachyear,springfollowswinter,whichfol
Mostof-usareusedtoseasons.Eachyear,springfollowswinter,whichfol
InwintertheremaybeseveralfeetofsnowinotherpartsofEnglandbutthere
随机试题
Therearefourbasictypesofcompetitioninbusinessthatformacontinuum
[originaltext]W:Goodafternoon,sir!IsthereanythingIcandoforyou?M:Ye
TravelhasbeenaconsiderablepartofmylifeandIhavedifferentkindsof
音像制品、电子出版物、新创刊的报纸和杂志、挂历等多采用发样订货的进货方式。(
王先生,男,63岁,A型血,考古学者,每天吸烟10支以上,经常吃腌制饮食,每天蔬
能与内因子结合形成复合物的维生素是A.维生素B1 B.维生素B2 C.维生素
属于不稳定细胞的是( )。A.小肠黏膜被覆上皮细胞 B.肝细胞 C.神经细
肖计划的“应对方式问卷”有6个分量表,其中包括()。(2009-11)A:求助
何种情况下机体由脂肪提供能量A.长期饥饿 B.空腹 C.进餐后 D.剧烈运
某市为了交通发展需修建一条双向快速环线(如图4-1所示),里程桩号为K0+000
最新回复
(
0
)