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
2018-02-03
44
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(大片浮冰), 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.
Where do polar bears usually hunt seals?
选项
A、On land.
B、In open water.
C、In openings in the sea ice.
D、At the bottom of the sea.
答案
C
解析
事实细节题。第三段第五句中的breathing hole,narrow tunnel through the ice与C选项的opening in the sea ice相对应。故选C。
转载请注明原文地址:https://kaotiyun.com/show/wfCO777K
0
成人本科学位英语
相关试题推荐
Yettherearethreedayswhichareusuallymarkedbysomekindofspecialceremony:thedayweareborn;thedaywegetmarried
SpeakerA:Tom,whydon’tyoucomeandhavethepicnicwithus?SpeakerB:______
Longbusridesareliketelevisionshows.Theyhaveabeginning,amiddle,andanend--withcommercialsthrownineverythreeor
Successinlifedoesnotdependsomuchonone’sschoolrecord______onone’shonestyanddiligence.
Forthispart,youareallowed30minutestowriteacompositiononthetopic:CellPhonesinHighSchool.Youshouldwriteatl
______you’vegotachance,youmightaswellmakefulluseofit.
Forthispart,youareallowed30minutestowriteacompositiononthetopic:ComputerGames.Youshouldwriteatleast100wor
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______inthelasttwentyyears.Themainchangehasbeen【C2】_
Ineededtogetsomemoney,so,afterChristmas,ItookajobintheclothesdepartmentatGraham’sforthefirstfortnightoft
Skatingcanbegoodforyou________correctly.
随机试题
下列业务会增加留存收益的是()。
黄芽茶用盖碗、壶冲泡,第一泡以30秒为宜,后续20秒出汤即可。
影响颅内压增高的因素有()
A.乌梅丸与阿司匹林B.麻仁丸与利福平C.痧气散与庆大霉素D.四逆汤与地高辛E.蛤蚧定喘丸与异烟肼影响药物排泄的中西药联用是()。
目前,银行最常见的个人贷款营销渠道不包括()。
下列法律规定中,属于法律要素中的法律规则的是()。
【2014年北京.单选】以肌肉骨骼的活动实现的合乎法则的程序化、自动化和完善化的外部动作方式是()。
清朝审理宗族案件的机关是( )。
社会主义在曲折中发展的决定性因素包括()
[A]SetaGoodExampleforYourKids[B]BuildYouKids’WorkSkills[C]PlaceTimeLimitsonLeisureActivities[D]Ta
最新回复
(
0
)