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
2025-03-10
29
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.
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. 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(洋流)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 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。根据定位句中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/3991303.html
相关试题推荐
去年冬天没有下多少雪。Itdidn’tsnowmuchlastwinter.
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
I(don’tthink)awarmwinteralways(has)anegativeinfluence(on)ourlife,(
Theelderlyneedspecialcareinwinter,astheyare______tothesuddenchange
每年成千上万只蝴蝶会从各个地方来到泉边。Everyyearthousandsofbutterfliesflytothespringfrome
InwintertheremaybeseveralfeetofsnowinotherpartsofEnglandbutthere
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
随机试题
[originaltext]M:Mycomputerwasattackedbythevirusandcannotwork.Ihave
Inancienttimes,judgesoftenresortedtotrialbyordealincaseswherenocon
Americanstendto______.[br][originaltext]Jack:Peter,peoplearoundthewo
[originaltext]Alcoholismisaseriousdisease.Nearly9millionAmericansalone
有关梨状肌综合征的诊治,下列选项不正确的是A.下肢内旋加重症状 B.臀部局限性
艾滋病病毒携带者怀孕以后,婴儿受感染的可能性是多大?()A、如不预防30%左右;
现代社会教育包括______教育机构和______教育机构两大类。
不属于抗甲状腺药的是A.普萘洛尔 B.复方碘溶液 C.甲巯咪唑 D.放射性
A.防止药物滥用 B.保证分装准确无误 C.保证发药正确率 D.保证药品质
目前我国正大力推进文化体制改革,特别是对国内的动漫产业和影视剧通过内容管控的方式
最新回复
(
0
)