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
2025-03-03
22
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] 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/3980406.html
相关试题推荐
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Itwasacoldwinterday.AwomandroveuptotheRainbowBridgetollbooth(
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Thetopoftheworldisawonderland.Inwinter,thetemperatureoftenfalls
Coralsareparticularlysensitivetochangesintemperature.珊瑚礁对温度的变化特别敏感。
Itwas________winternightandapalemoonhunglowin________sky.A、a;aB、the;
随机试题
[originaltext]Goodmorning.Haveyoueverboughtashirtordressonlineon
(1)Inundatedbymoreinformationthanwecanpossiblyholdinourheads,we
ItisverystrangebutIhadan______thattheplanewouldcrash.A、inspiration
对疮疡破溃伤口皮肤消毒,涂擦消毒剂的顺序是A.由伤口的中心部向四周涂擦 B.由
A.宣肺解毒,利湿消肿 B.运脾化湿,通阳利水 C.分利湿热 D.温运脾阳
下列与呼吸有关的数值中,正确的是A:正常成年人潮气量为200~300ml B:
以下不属于消化性溃疡典型临床特点的是A.病程长 B.发作期和缓解期交替出现
2012年1-4月,人民币新增贷款环比增长率大于同比增长率的月份是:()
城镇人口增加的速度加快与农村人口的转化将趋于停止的现象,是在城市化进程中的哪些阶
“宫斗剧”的盛行及其与当下社会的微妙对应,典型地体现了我们在现实困境中面对传统时
最新回复
(
0
)