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
32
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
Completethesentencesbelow.WriteNOMORETHANTHREEWORDSforeachanswer.Th
【C1】______arethemissionsofalearnedsocietyinaneraofdigitalnetwo
TheTelecommunicationsRevolutionA)Atransformationisoccu
正常人前列腺液在高倍镜下可见到()。A.白细胞小于5个,无卵磷脂小体 B.白
造成变压器差动保护不平衡电流的因素有电流互感器变比标准化,两侧电流互感器二次
对于石灰粉煤灰稳定粗粒土,使用的无侧限抗压试模高与直径相同时,尺寸为()。
门禁系统验收,门禁控制单元验收要求:变电站大门口采用()的开门方式。“卡+密码”
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
叶某诉汪某借款纠纷案,叶某向法院提交了一份内容为汪某向叶某借款3万元并收到该3万
下列关于培训与开发中的案例研讨法的说法中,错误的是( )。A.运用案例研讨法的
最新回复
(
0
)