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
2024-01-16
11
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] 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://tihaiku.com/zcyy/3367319.html
相关试题推荐
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
Mostofusareusedtoseasons.Eachyear,springfollowswinter,whichfoll
Switzerlandis______aplacetoindulgeinallyourfavoritewintersports;it
Theelderlyneedspecialcareinwinter,astheyare______tothesuddenchangeo
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
随机试题
Technologyisanothergreatforceforchange.Inpart,technologyhascaused
Americanculturehasbeenenrichedbythevaluesandbeliefsystemsofvirtu
[originaltext][5]OnOctober17,hurricaneGonzalohittheislandofBermuda
健康干预的实施需要培育并动员支持性社会网络,那么社会网络的作用是()A.提
分离挥发油中脑类成分最常用的方法为A.分馏法B.化学法C.冷冻法D.层析法E.萃
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
简述现代企业人力资源管理各个历史发展阶段的特点。
材料:德国人米斯特今年某日持所购京剧票去北京H剧院观看京剧“空城计”,不料该剧几
《期货从业人员执业行为准则(修订)》是期货从业人员在执业过程中必须遵守的行为规范
醌类化合物通用的显色反应是A.无色亚甲蓝反应 B.Borntrager反应
最新回复
(
0
)