首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The top of the world is a wonderland. In winter, the temperature often falls to -30°F and the sun never rises. The ocean is surr
The top of the world is a wonderland. In winter, the temperature often falls to -30°F and the sun never rises. The ocean is surr
admin
2016-09-28
49
问题
The top of the world is a wonderland. In winter, the temperature often falls to -30°F and the sun never rises. The ocean is surrounded by frozen ground. There are few people or trees, but to polar bears, the Arctic(北极)is home.
Polar bears have thick fur, big paws and other features that make them well prepared for life in their tough environment. In fact, they need the Arctic sea ice for survival. But climate change is causing larger and larger areas of summer sea ice to melt(融化). Experts say that if warming patterns continue, the Arctic could be free of summer sea ice by 2050. That may cause two-thirds of the word’ s 20,000 polar bears to be gone by then too.
Polar bears can’ t survive for long on land. Seals are their main source of food. The only place where polar bears can hunt seals is on the ice. Although these bears are strong swimmers, they are no match for lightning swift seals in the water. A polar bear has brilliantly clever strategies to overcome this disadvantage. In winter the bear waits motionless beside a seal’ s breathing hole, which is a narrow tunnel through the ice. Often many hours pass before the seal comes up for air and the bear kills it with a powerful blow of its paw. In summer, the polar bears that live on land eat very little and wait for the sea ice to return.
With the sea ice forming later in the year and melting earlier, polar bears do not have enough opportunity to hunt and eat. Less sea ice makes it harder for the bears to catch the seals. The bears must swim longer distances between ice packs(大片浮水), and they can’t always make it. The ice is also getting thinner. These conditions can cause polar-bear cubs to become separated from their mothers, who provide them with food.
Steven Amstrup is the chief scientist of Polar Bear International. The group aims to save the bears and their home. " The more people who see polar bears and understand their difficult situations, the better the chance we’ll alter our warming path in time to save them," he says.
Which is the best title for the passage?
选项
A、Climate Change in the Arctic
B、How to Protect the Environment
C、The Arctic Is Home to Polar Bears
D、Polar Bears in Danger
答案
D
解析
主旨大意题。从第一段中提到polar bear开始,之后的每段首句都说到了polar bear,因此,这个词就成为了全文的中心话题。再根据第二段的末句以及第三段的首句,第四段首句,第五段的首句,可以看出,全文讨论的重心是在环境变化给北极熊带来的生存危机。故选D。
转载请注明原文地址:https://kaotiyun.com/show/nKRO777K
0
成人本科学位英语
相关试题推荐
TheUnitedStates(56)alargepartoftheNorthAmericancontinent.ItsneighborsareCanada(57)thenorth,(58)Mexicotothe
Musiccomesinmanyforms;mostcountrieshaveastyleoftheirown.【C1】______theturnofthecenturywhenjazzwasborn,Americ
Thespeaker’s______voiceputtheaudiencetosleep.
Owingto______competitionamongtheairlines,travelexpenseshavebeenreducedconsiderably.
ItwasaquarterpastnineasMariehurriedintotheofficebuildingwhereshewasgoingtowork.Herhusmovedslowlyalongthr
Whatdocats’eyesandhighwayreflectorsignshaveincommon?Theybothactasretro-reflectors(反响反射器).Almosteveryonehas
NursingatBethIsraelHospitalproducesthebestpatientcarepossible.Ifwearetosolvethenursingshortage,hospitaladmin
Everyoneisexposedtoit,sonaturallysomepeoplewillimitatewhattheyseeonTV,whattheyreadinthenewspapersandwhat
ForoneJapanesemanandhiswife,attendingtheWorldCupmatchbetweenJapanandRussiaonSundayislikelytobeabitterswe
Olderpeoplemustbegivenmorechancestolearniftheyaretocontributetosocietyratherthanbeafinancialburden,accordi
随机试题
超文本传输协议的英文缩写是______。
A.糖有氧氧化B.糖酵解C.2,3一磷酸甘油酸旁路D.糖异生E.磷酸戊糖途径供应成熟红细胞能量的主要代谢途径是()
钢铁厂汽车司机任某,他的工作是用汽车将一车间的钢铁废料拉到二车间进行第二次加工,由于厂里实行计件工资,任某一直在厂内运输废料时违反规定开车速度很快,一日由于在厂区内因驾驶速度太快,撞死一女工。任某的行为构成( )。
(2009年)经乙国同意,甲国派特别使团与乙国进行特定外交任务谈判,甲国国民贝登和丙国国民奥马均为使团成员,下列哪些选项是正确的?()
A供气公司位于N省B市C县工业园区内,有员工225人,法定代表人为甲。甲认为,公司员工不足300人,没有必要设置安全生产管理部门,也没有必要配备专职安全生产管理人。公司技术人员乙于2010年通过了全国注册安全工程师执业资格考试,但未注册。乙被甲任命为公司兼
使用酸性焊条焊接时,对其药皮作用表述正确的是()。
关于输入值,下列说法中错误的是()。
加强公共服务活动的程序控制,是提升服务质量和公正性的重要手段。下列属于程序控制的是:
2
To:BrianWrightFrom:SteveBarrettDate:April27Subject:EmployeeTrainingRoomReservationDearMr.Wright,Thisisame
最新回复
(
0
)