首页
登录
职称英语
The top of the world is a wonderland. In winter, the temperature often falls
The top of the world is a wonderland. In winter, the temperature often falls
游客
2025-03-04
16
管理
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. [br] 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://tihaiku.com/zcyy/3981882.html
相关试题推荐
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
Therewasn’tmuchsnowlastwintersopeoplecouldn’tgo______exceptinth
Theelderlyneedspecialcareinwinter,astheyare______tothesuddenchangeo
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
随机试题
[img]2012q1/ct_etoefm_etoeflistz_0321_20121[/img][br]Whatdoesthestudentmea
AstrologyA)Astrologyisthestudyofhowthesun,themoon,planets,an
______,locatedatthesouthernendofLakeMichigan,isthesecondlargestcity
A—CapitalCityB—KeyCityC—CommonCityD—ProvincialBoun
能抑制脱氧胸苷酸合成酶的药物是氟尿嘧啶。()
下列属于企业对待非合同利益相关者的社会责任的是( )。A.设计人性化的工作方式
投资方式属于比例组合法的是( )。A.长线投资 B.中长线投资 C.中线投
通过有组织的气流流动,控制有害物的扩散和转移,保证操作人员呼吸区内的空气达到卫生
编制设计概算时,国产标准设备的原价一般选用( )。A.不含备件的出厂价 B.设
关于物理性质与毒性效应说法正确的是A.毒物脂/水分配系数越大,毒性越小 B.毒
最新回复
(
0
)