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 autumn, which follows summer, which follows spri
Most of us are used to seasons. Each year, spring follows winter, which follows autumn, which follows summer, which follows spri
admin
2009-02-15
34
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 (使某事清楚明白地显示) where ice sheets (冰川) 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 (区域).
This surprised the researchers from the University of Bern (伯恩大学). Scientists have long assumed (假设) 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 (证据) 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 (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 (神秘的事物) as to what caused the temperature changes that caused the ice to melt.
选项
A、most of the ice melted in the Northern hemisphere
B、most of the ice melted in the Southern hemisphere
C、The North Pole is colder than the South Pole
D、The South Pole is colder than the North Pole
答案
A
解析
根据Scientists have long assumed(假设)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...可知答案。
转载请注明原文地址:https://jikaoti.com/ti/L3tsFFFM
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
Whydidthewomaneattheberrieseventhoughshewasnotsurewhethertheywerepoisonous?
Whydidthewomaneattheberrieseventhoughshewasnotsurewhethertheywerepoisonous?
Withtheworld’spopulationestimatedtogrowfromsixtoninebillionby2050,researchers,businessesandgovernmentsarealr
Oneinsix.Believeitornot,that’sthenumberofAmericanswhostrugglewithhunger.Tomaketomorrowalittlebetter,Feedin
Oneinsix.Believeitornot,that’sthenumberofAmericanswhostrugglewithhunger.Tomaketomorrowalittlebetter,Feedin
Here’showIwanttowatchthe2014WinterOlympics.IwanttogotoaWebsitetoseeanyeventIwant,wheneverIwanttowat
ThepassageshowsuswhenAmericansneedadvicetheyoftengetitfrom______.Accordingtothepassage,newspapersandmagazin
OnehundrednewbookstallsthatwillsellnewspapersaswellasbookshavebeenmakingtheirdebutoncitystreetssinceSaturda
Itdoesn’tmatterwhenorhowlongapersonsleeps,buteveryoneneedssomeresttostayalive.That’swhatalldoctors’thought
MichaelJacksonisfamousforhis______trotMuhammadAliforhis______.Except______,asuperstarwillperhapshaveeveryth
随机试题
国际标准化组织制定推出ISO14000环境管理系列标准后,我国将其等同转换为国家标准()系列标准。
我国“独立自主,自力更生”方针的理论依据是
A.清热解毒B.祛瘀通络C.疏风清热D.平肝潜阳E.平肝息风头痛证属肝阳上亢,宜选用的治法是()。
对于国有土地,在出现下列()情形时,由有关人民政府土地行政主管部门报经原批准用地的人民政府或有批准权的人民政府批准,可以收回建设单位的使用权。
委托代理关系可因下列( )原因终止。
A企业只生产一种产品,单位变动成本6元,单价10元,固定成本20000元,若想实现4000元的利润,应使销售量达到()件。
根据比尔·盖茨确立的10大优秀员工准则,要使员工与公司制定的长期目标保持一致,需要把握的事情主要包括()。
要按照稳定政策、改革创新、持续发展的总要求,力争在体制机制创新上取得______,在现代农业发展上取得______,在社会主义新农村建设上取得______,为保持经济社会持续发展提供有力支撑。填入划横线部分最恰当的一项是:
如果没有正确的工作方法,即使每天埋首于工作,忙得__________,也还是会收获甚微,__________。填入画横线部分最恰当的一项是:
设有两个事务T1、T2,其并发操作如下所示。下列说法中正确的是()。
最新回复
(
0
)