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 au-tumn, which follows summer, which follows spr
Most of-us are used to seasons. Each year, spring follows winter, which follows au-tumn, which follows summer, which follows spr
admin
2011-01-14
88
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.
Between 65,000 and 35,000 years ago, ______.
选项
A、the temperature changed a lot
B、the earth was much warmer than it is now
C、winter isn’t colder than summer
D、most of the ice that melted was in the Northern hemisphere during the 30,000-year long ice age
答案
A
解析
细节题。根据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 peri-ods of warming and cooling.可知答案为A。
转载请注明原文地址:https://kaotiyun.com/show/F8JO777K
0
成人本科学位英语
相关试题推荐
Acomputerisamachinedesignedtoperformworkmathematicallyandtostoreandselectinformationthathasbeenfedintoit.I
Americaisthelandoftheautomobile.Thiscountryhasonly6percentoftheworld’spopulationoutof46percentoftheworld’
WhoarethepoorintheUnitedStates?Asof1970,nearlytwo-thirdsofthepoorpeoplewerewhite.Althoughnonwhitesmakeupo
INTHEBEDROOMDon’tsmokeinbed—itcausesabout1000firesayear,manywithfatalresults.Don’toverloadyourelect
Formillionsofyearsbeforetheappearanceoftheelectriclight,shiftwork,allnightcableTVandtheInternet,Earth’screa
RelationsbetweentheUnitedStatesandColombiasufferedformanyyearsbecauseofanincidentinvolvingtheRepublicofPanama
Packagingisanimportantformofadvertising.Apackagecansometimesmotivatesomeonetobuyaproduct.Forexample,asmallc
Inanaveragewinter,highwaydepartmentsspreadsometenmilliontonsofsalttokeeproadssafe.Thecorrosiveeffectsarewel
Anyonewhodoubtsthatchildrenarebornwithahealthyamountofambitionneedspendonlyafewminuteswithababyeagerlylea
Abenefitperformanceisaperformanceforwhichacharitableorganizationhasboughtoutatadiscountedpriceand______fundsb
随机试题
一个简单的酶促反应,当[S]<<Km时,出现的现象是
患者,女,35岁,已婚。患崩漏1年余。经血非时而至,经量甚多、色淡、质稀,面色苍白,气短懒言,大便不成形,舌淡苔薄白,脉沉弱。其证候是()
悬臂式桩板挡墙的桩长在岩质边坡地基中的嵌固深度不宜小于桩总长的()。
依据《社会生活环境噪声排放标准》,某卡拉OK厅拟建在乡村集镇内,环境影响评价时,则该卡拉OK厅执行的昼夜噪声排放限值分别是()。
利润表中的税金及附加项目,包含经营活动发生的增值税、消费税、城市维护建设税、资源税和教育附加税等。()
西北地区最大的城市是西安。()
A、 B、 C、 D、 B
Americansaregettingreadyforthebiggestsoccereventintheworld.Forthefirsttimetheworldcupsoccercompetitionwill
Thinkaboutwhatwouldmakeyoureally,reallyhappy.Moremoney?Wrong.Smiling,well-adjustedkids?Wrongagain.Thefactisw
Lipstickplaysanimportantroleinsexual【C1】______andcanevenprotectthelipsfrom【C2】______inharshweather:No【C3】______it
最新回复
(
0
)