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
40
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] 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 to help their research work
答案
C
解析
推理判断题。根据定位句可知,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://tihaiku.com/zcyy/3991301.html
相关试题推荐
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
______Idon’tlikearethelong,darknightsofwinter.A、ThatB、WhatC、WhichD、
Switzerlandis______aplacetoindulgeinallyourfavoritewintersports;it
ItwasabrightspringafternoonwhenFredatoldmeshewouldn’tneedmeany
ItwasabrightspringafternoonwhenFredatoldmeshewouldn’tneedmeany
ItwasabrightspringafternoonwhenFredatoldmeshewouldn’tneedmeany
ItwasabrightspringafternoonwhenFredatoldmeshewouldn’tneedmeany
Therewasn’tmuchsnowlastwintersopeoplecouldn’tgo______exceptinth
Theelderlyneedspecialcareinwinter,astheyare______tothesuddenchangeo
随机试题
教师被人们称为“园丁”、“人类灵魂的工程师”,是受到全社会尊重的一种职业。每年的10月5日为世界教师日。【T1】该节日旨在赞扬和感谢全世界教师为教育事业
PartⅡReadingComprehension(SkimmingandScanning)Directions:Inthispart,y
Kitchendutiesmayhavetraditionallybeenviewedaswomen’swork,butnota
水基型灭火器出厂期满3年首次维修,首次维修以后每满2年维修。
“长期以来,预算草案编制过于简单,外行看不懂、内行说不清;代表没有办法审议。如何
医生在器官移植问题上的道德责任,错误的是()A.对活体的捐献,要保证供者的
是否要求权利与义务的对等表现了法律与道德在( )的不同。A.表现形式 B.内
共用题干 Hitchhiking(搭车旅游)WhenIwasinmy
1982年,美国堪萨斯期货交易所开发了价值线综合指数期货合约,使()也成为期货
张某3月1日向银行申请了一张贷记卡,6月1日取现2000元,
最新回复
(
0
)