首页
登录
职称英语
Most of-us are used to seasons. Each year, spring follows winter, which fol
Most of-us are used to seasons. Each year, spring follows winter, which fol
游客
2025-03-14
1
管理
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. [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 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://tihaiku.com/zcyy/3997405.html
相关试题推荐
Rosesneedspecialcare______theycanlivethroughwinter.A、becauseB、sothat
Onereasonmaybethatinspringman’smentalabilitiesareaffectedbythesame
Thepriceofoil______from$15to$18pertankduringthewinterseason.A、rang
Thepriceoffishis______.duringtheSpringFestival.A、expensiveB、highC、valu
Mostof-usareusedtoseasons.Eachyear,springfollowswinter,whichfol
Mostof-usareusedtoseasons.Eachyear,springfollowswinter,whichfol
Mostof-usareusedtoseasons.Eachyear,springfollowswinter,whichfol
Mostof-usareusedtoseasons.Eachyear,springfollowswinter,whichfol
InwintertheremaybeseveralfeetofsnowinotherpartsofEnglandbutthere
去年冬天没有下多少雪。Itdidn’tsnowmuchlastwinter.
随机试题
IthadbeenbarelysixweekssinceMichaelBeltranandhisstaffreopenedhi
UniversitiesintheUSThereare【T1】______intheUnitedStates.Nearlyh
A.肝脏左叶增大,右叶萎缩,肝实质被网状高回声分隔,呈"地图样"改变 B.肝实
银川市是1993年公布的第三批国家历史文化名城。
下列哪项不是急性胃炎的常见病因A.药物 B.暴饮暴食 C.细菌毒素 D.急
216.党支部指定专人收缴管理党费。一般由()负责收缴党费,支部组织委员将各小
利润是企业在一定期间的()。A.经营收入 B.经营毛利 C.经营成果 D.
目前,财政部在上海、深圳证券交易所和银行间债券市场上以()方式发行记账式国债
关于利率互换,下列说法正确的是()。A.利率互换双方不交换本金 B.交易
前牙区牙龈肿物,呈息肉状。镜下见肿物由大小不等的毛细血管组成,被纤维组织分成
最新回复
(
0
)