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
2024-01-15
36
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.
(78)
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 world’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.(79)
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 cf Polar Bears International. The group aims to save the bears and their home. "The more people who see polar bears and understand their difficult situation, 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
主旨题。全文都是围绕北极熊由于生存环境的恶化而濒临灭绝展开的,因此选择D。
转载请注明原文地址:https://tihaiku.com/zcyy/3365843.html
相关试题推荐
Therewasn’tmuchsnowlastwintersopeoplecouldn’tgo______exceptinth
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Wemustmake________ourmindswheretogoforourvacationthiswinter.A、outB、u
Wemustmake______ourmindswheretogoforourvacationthiswinter.A、outB、up
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Itwas______winternightandapalemoonhunglowin______sky.A、a:aB、the:the
随机试题
SomehowCaliforniaisalwaysatthecuttingedge,beitintheflower-power
[originaltext]W:Hi,Bob.Howisyouroralpresentationcomingalong?M:Whato
SellingaCarHowlonghaveyoubeendrivingaroundinth
SE序列相位重聚是指:A.90°脉冲激励时 B.90°脉冲激励后 C.180
举办大型群众性活动应当符合下列哪些条件()A.具有符合本条例规定的安全工作
下列关于药师调剂处方时必须做到的“四查十对”正确的是A.查处方,对科别、姓名、年
为了坚持、扩大和巩固抗日民族统一战线.中国共产党制定的策略总方针是( ) A
基础心理学是研究()。 (A)正常成人心理现象的心理学基础学科 (B
关于金融监管体制的说法,错误的是()。A.德国实行的是独立于中央银行的综合监管
企业进行筹资时,首先应利用发行普通股筹资,然后再考虑利用留存收益筹资。()
最新回复
(
0
)