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
18
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] We can infer from the passage______.
选项
A、the ice can easily just slip into the ocean
B、volcanoes caused the ice to melt
C、melting just in the Northern hemisphere would have been impossible
D、researchers often use the computer models to help their research work
答案
C
解析
推理判断题。根据定位句可知,冰川既不可能只在南半球融化,也不可能只在北半球融化。故答案为C。
转载请注明原文地址:https://tihaiku.com/zcyy/3376739.html
相关试题推荐
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
A、Itishotinsummerandcoldinwinter.B、Itisrainyandgenerallycoldally
[originaltext]Manypeoplecatchacoldinthespringtimeorfall.Itmakes
[originaltext]Manypeoplecatchacoldinthespringtimeorfall.Itmakes
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]Ifyoufeellikeyouhadonetoomanydrinksoverthewinter
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
Allflights______becauseofthesnowstorm,wedecidedtotakethetraininstead
After______forthejob,youwillberequiredtotakealanguagetest.A、beingi
Stressmaybedefinedastheresponseofthebodytoanydemand.Wheneverpeo
Manyofthemostdamagingandlifethreateningtypesofweathertorrentialra
哪项是治疗外感风寒之眉棱骨痛首选药A.藁本 B.蔓荆子 C.辛夷 D
下列哪一项不符合多发性骨髓瘤A.高钙血症 B.高黏滞血症 C.高白蛋白血症
张某在脚手架上施工时,发现部分扣件松动而可能倒塌,所以停止了作业,这属于从业人员
临终患者感知觉改变的表现有A:大便失禁 B:视觉减退至消失 C:小便失禁
小孙下班收工关闭车床时。因与同事聊天未遵守操作规程导致手指被车床挤伤,花去医疗费
现行建筑安装工程费用组成的有关规定,施工机械使用费包括()。A.机械操作人员的
最新回复
(
0
)