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
2024-01-19
61
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] 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 colderthan it is now.During that time the temperature also changed a lot.with periods of warming andcooling.可知答案为A。
转载请注明原文地址:http://tihaiku.com/zcyy/3376742.html
相关试题推荐
[originaltext]Manypeoplecatchacoldinthespringtimeorfall.Itmakes
[originaltext]Manypeoplecatchacoldinthespringtimeorfall.Itmakes
[originaltext]Onewinterdayin1891,aclassatatrainingschoolinMassa
[originaltext]Onewinterdayin1891,aclassatatrainingschoolinMassa
[originaltext]Onewinterdayin1891,aclassatatrainingschoolinMassa
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]Ifyoufeellikeyouhadonetoomanydrinksoverthewinter
中国每年都要为庆祝农历新年举办电视联欢晚会,其中,最具代表性的当属央视春晚(SpringFestivalGala)。1983年开始推出的央视春晚可谓
春联(thespringcouplet)是中国一种独特的文学形式。它由贴在门两侧的两个对立的(antithetical)句子和贴在门上方的横批(hori
随机试题
Theevolutionofsexratioshasproduced,inmostplantsandanimalswithse
BOMBASTIC:A、unassumingB、mediocreC、mysteriousD、imitativeE、intricateA
AmericanBlackEnglishI.OverallCurrentCondition;difficulttosaythenumber
[A]finance[I]intimate[B]switched[J]decline[C]Consistently[K]profes
Theneuroscientistdidastudyinordertotellwhetherchildrenwillfeelthep
初孕妇,25岁,孕1产0,末次月经不清,产科检查量宫高为32cm,腹围94cm,
肝性脑病的防疗原则?
D
王某怀疑其妻与其表兄刘某有不正当关系,遂于某晚跟踪其妻至刘某住所。进屋后,王发现
人工费包括()。A.基本工资 B.津贴和补贴 C.差旅交通费 D.职工福利
最新回复
(
0
)