首页
登录
职称英语
Most of us are used to seasons. Each year, spring follows winter, which foll
Most of us are used to seasons. Each year, spring follows winter, which foll
游客
2025-03-14
1
管理
问题
Most of us are used to seasons. Each year, spring follows winter, which follows autumn, 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.
(77)
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 either northern or southern regions.
This surprised the researchers from the University of Bern. (78)
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] The scientists are not sure______.
选项
A、how long the ice age lasted
B、where ice sheets melted during the ice age
C、what caused the temperature changes
D、what the earth is made up of
答案
C
解析
事实细节题。根据文章最后一句It is still a mystery as to what caused the temperature changes that caused the ice to melt.可知科学家们现在还没有找到引起温度变化的原因。
转载请注明原文地址:https://tihaiku.com/zcyy/3996049.html
相关试题推荐
Inwinter,animalshaveahardtime______anythingtoeat.A、tofindB、tofindin
Mr.Andersonusedto(jogging)inthe(earlymorning)air(during)(thewinterm
Rosesneedspecialcare______theycanlivethroughwinter.A、becauseB、sothat
Onereasonmaybethatinspringman’smentalabilitiesareaffectedbythesame
Thepriceofoil______from$15to$18pertankduringthewinterseason.A、rang
Mostof-usareusedtoseasons.Eachyear,springfollowswinter,whichfol
Mostof-usareusedtoseasons.Eachyear,springfollowswinter,whichfol
InwintertheremaybeseveralfeetofsnowinotherpartsofEnglandbutthere
Shelooksforwardeveryspringto______theflower-linedgarden.A、walkinginB、
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
随机试题
Pleasehave____________(医生签署这个报告).yourdoctorsignthereport.have作为使役动词时,它的句型是h
Theygotooneoftheworld’smostprestigiousuniversitiesandpridethemse
Anunconsolidatedaggregateofsiltparticlesisalsotermedsilt,______acons
二十岁未婚女性,原发性闭经。第二性征乳房发育但乳头小。阴毛和腋毛均缺如。黄体酮注
西方商业银行资产负债管理的发展阶段分别为()。A.资产管理阶段 B.资本管理
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
价值工程的目标是以( )实现项目必须具备的功能。A.最少的项目投资 B.最高
在管道发生大量泄漏时紧急止漏,一般还具有过流闭止及超温闭止的性能,并且能在近程和
红细胞生成缺铁期(IDE)的评价指标是( )。A.细胞色素氧化酶活性 B.谷
在弱势群体参加的人体实验中,错误的提法是A.具有一定自主能力的未成年人,也应取得
最新回复
(
0
)