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
2025-03-05
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 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. 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 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] 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。根据第三段The only place where polar bears can hunt seals is on the ice.可知选择C。
转载请注明原文地址:https://tihaiku.com/zcyy/3983212.html
相关试题推荐
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Harriet:Didyouheartheweatherforecast?______Jodie:Thetemperaturetomorr
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
随机试题
卖出套期保值者在下列()情况下可以盈利。A、基差从—20元/吨变为—30元/吨B、基差从20元/吨变为30元/吨C、基差从—40元/吨变为—30元
[originaltext]M:Goodmorning,Dr.Smith.MynameisPeter.Iamafreshmanin
第四方物流的特点包括()。A.提供一整套完善的供应链解决方案 B.通过其对
在网络计划中,工作间的逻辑关系分为工艺关系和组织关系。下列关于工作间逻辑关系的说
A.0 B.-3 C.1 D.3
保护屏柜下部的铜排应用截面不小于50mm2的铜缆接至保护室内的等电位接地网。
下列关于评估的说法,正确的是()。A.评估是社会救助社会工作开展的目的 B.
下列关于贷款支付与发放的表述,正确的有()。A.贷款人应根据借款人的行业特征、
中国期货业协会负责期货投资咨询业务从业人员的资格考试、资格认定、日常管理等相关工
可用于中线放样的仪器有()。A.GPS测量仪 B.全站仪 C.水准仪 D
最新回复
(
0
)