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
16
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:https://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
TheInternetandInternetuserscanbetargetsforhackers.Hackersarepeop
某工程建设工期为36个月,工程合同价为5000万元。根据我国《建筑工程施工许可管
压力性尿失禁多见于()。A.体力劳动者 B.老年男性 C.经产妇 D.老
青年教师小王刚入职就加入冯老师主持的名师工作室,积极参与各项教研活动,很快适应了
在弗洛伊德看来,一个人的个性形成于( )A.3岁左右 B.5岁左右 C.7
货币执行流通手段的特点有( )。A.必须是现实的货币 B.可以是观念形态的货
甲、乙两个国有企业出资设立丙有限责任公司。下列关于丙有限责任公司组织机构的表述中
下列四个杆件均受图示轴向力作用,其中轴力图不正确的是()。A. B. C
下列加固形式中,可以用于风管的内支撑加固的有()。A.角钢内支撑 B.扁钢
使用各单位自购的建筑起重机械中,应当报废并向原备案机关办理注销手续的有( )。
最新回复
(
0
)