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
59
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:http://tihaiku.com/zcyy/3376741.html
相关试题推荐
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]Manypeoplecatchacoldinthespringtimeorfall.Itmakes
[originaltext]Manypeoplecatchacoldinthespringtimeorfall.Itmakes
[originaltext]Onewinterdayin1891,aclassatatrainingschoolinMassa
[originaltext]Onewinterdayin1891,aclassatatrainingschoolinMassa
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
冬至(thewintersolstice)为每年公历12月22日左右。冬至是北半球(theNorthernHemisphere)全年中白天最短、
随机试题
TheNBAlockout(停工)didnotfinishonThursdaynight,butitwasnearlyanen
[originaltext]W:Tonyisthebestcross-countryrunnerwe’veeverhadinthiss
Fiftyyearsago,mostpeople’sdailylevelsofactivitywereequivalenttow
WillthereeverbeanotherEinstein?Thisistheundercurrentofconversation
血小板α颗粒内容物为A.FG、β-TG和5-HT B.FG、PF和5-HT
丙公司2012年5月31日银行存款日记账账面余额为226000元,银行对账单余
女性,32岁,肥胖、高血压、闭经1年,为排除Cushing综合征,下列哪项检查最
眼神经出颅于A.破裂孔B.卵圆孔C.眶上裂D.圆孔E.颈动脉孔
根据《房屋建设与装饰工程工程量计算规范》(GB58555-2013)关于石砌体
男孩,4岁,反复咳嗽2个月,查体:体温正常,浅表淋巴结(-),咽(-),两肺多哮
最新回复
(
0
)