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
2020-11-14
62
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 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. 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, 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
文章第三段提到的“breathing hole,a 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://jikaoti.com/ti/UrzYFFFM
0
成人本科学位英语
相关试题推荐
Treesareusefultomaninthreeimportantways:theyprovidehimwithwoodandotherproducts:theygivehimshade:andtheyhel
InlearningEnglishweshouldnot()studentsoftheirmistakesallthetime.
Televisionhasopenedwindowsineverybody’slife.Youngmenwillneveragaingotowarastheydidin1914.Millionsofpeoplen
Therewasatimeinmylifewhenbeautymeantsomethingspecialtome.IguessthatwouldhavebeenwhenIwasaboutsixorseve
Wouldyouriskyourlifeforacountrythatconsideredyouasecond-classcitizen?Wouldyoujoinamilitarythataskedyoutor
Gary:Hi,Mike,we’rehavingapartytonight,wannacomejoinus?Youcanbringyourgirlfriend.Mike:Well...【D8】______Gary:W
Forreasonsofsafetyandeaseofmaintenance,Washingtonanddozensofothercommunitiesarebuildingrubbersidewalksmade【C1】
Imagineonedayreadingthatyouhadbeenasubjectinariskyscienceexperimentwithoutknowingit.Atschool,youhadbeenfe
Sheleaned______thewallwhileshewasspeakingtoherfriend.
Acompletelynewsituationislikelyto______whentheschoolleavingageisraisedto16.
随机试题
痢下白多赤少一般多重用
既能凉血止血,又能解毒、敛疮的药物是
患者,48岁。因下前牙松动1年就诊。检查:下前牙均有I~Ⅱ度松动,结石较多,深牙周袋,X线片示下前牙牙槽骨吸收严重。牙周病进展期的病理变化不包括
关于颌骨骨折描述不正确的是
资金结构是指借款人全部资金来源中负债和所有者权益所占的比重和相互间的比例关系。()
供给富有弹性表示为()。
心理学家________根据著名的双生子爬楼梯实验提出了个体发展的成熟决定论。
Inspiteof"endlesstalkofdifference,"Americansocietyisanamazingmachineforhomogenizingpeople.Thereis"thedemocrat
Pollutionisa"dirty"word.Topollutemeanstocontaminate--topsoilorsomethingbyintroducingimpuritieswhichmake【C1】_____
TheNationalDayofCanadais
最新回复
(
0
)