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
2024-01-17
53
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
细节题。此句中的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:http://tihaiku.com/zcyy/3370640.html
相关试题推荐
[originaltext]Ifyoufeellikeyouhadonetoomanydrinksoverthewinter
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
______Idon’tlikearethelong,darknightsofwinter.A、ThatB、WhatC、WhichD、
Switzerlandis______aplacetoindulgeinallyourfavoritewintersports;it
Whenthedoctor1tookmytemperature,itwasthreedegreeabove______.A、average
Therewasn’tmuchsnowlastwintersopeoplecouldn’tgo______exceptinth
Theelderlyneedspecialcareinwinter,astheyare______tothesuddenchangeo
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
随机试题
Whichcountryranksamongtheworld’sbigproducersofmilkandbeef?A、Australia
WhatwasSulaimanHashim?[br][originaltext]PoliceinSingaporeareinvesti
A. B. C. D.
PING发出的是()类型的报文,封装在(请作答此空)协议数据单元中传送。A.
以下()情况为工地试验室失信行为。A、试验检测原始记录信息及数据记录不全 B
()是指经国家有关部门批准的可以从事境外股票、债券等有价证券业务的证券投资基金
(2013年)根据《测绘作业人员安全规范》,在人烟稀少、条件恶劣环境下作业时,下
下列建设项目中,应采取招标等公开竞价方式取得国有建设用地使用权的有()。A
2010年巴塞尔协议Ⅲ中,为增强单家银行以及银行体系维护流动性的能力,引入的流动
下列成本费用中,属于经营成本的有()。 A.修理费 B.外购原材
最新回复
(
0
)