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
2025-03-06
7
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/3985201.html
相关试题推荐
Wemustmake________ourmindswheretogoforourvacationthiswinter.A、outB、u
Wemustmake______ourmindswheretogoforourvacationthiswinter.A、outB、up
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Itwas______winternightandapalemoonhunglowin______sky.A、a:aB、the:the
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
随机试题
[originaltext]Ihavebeenteachingforalongtime,andindoingsoIhave
土工合成材料在加筋(低透水性土)土坡中的应用前景是将士工合成材料作为含有活性炭纤
患者男,45岁。3天前右小腿皮肤破损处略红肿,疼痛,未予重视。今日病变扩散蔓延,
银行依据心理因素细分市场时,需考虑客户的( )。A.生活方式 B.个性 C
图示截面对z轴的惯性矩Iz为( )。
下面说法错误的是()。A.避暑山庄位于河北承德 B.寄畅园位于苏州 C.
下列厂房,可采用表面平均温度90℃的电热散热器供暖的是()。A.金属钠厂房
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
当梁间净距小于()时,可不计梁对探测器保护面积的影响。A.0.5m;B.0.8
(2021年第1批真题)施工总承包管理模式中,对业主选定的分包方承担组织和管理责
最新回复
(
0
)