首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
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 sur
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 sur
admin
2017-07-14
31
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.
Which is the best tide 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
全文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://kaotiyun.com/show/hFCO777K
0
成人本科学位英语
相关试题推荐
WhileAmericanrappershavebeenpopularinChinasincethe1990s,homegrownrapdidn’tgainafollowinguntiladecadelater.
______tomorrow,weshouldbeveryglad.
Ineverycultivatedlanguagetherearetwogreatclassesofwordswhich,takentogether,comprisethewholevocabulary.First,t
Withlargernumbersofgraduatesthaneverbefore,justhavingadegreewillnolongerbeenoughtomakeyou______inthecrowd.
Itusuallytakesmuch(less)timetoflyfromonecountryto(another)than(traveling)(by)train.
Anotherthinganastronauthastolearnaboutiseatinginspace.Foodisweightless,justasmenare.Foodforspacehast
Wearelate.Iexpectthefilm______bythetimewegettothecinema.
Astohimself,heregardedit______ofverylittlevalue.
这个国家以其美丽的湖泊而闻名于世。
我父亲在找工作,我母亲在医院照看外祖母。
随机试题
明清之际,要求以“天下之法”代替“一家之法”,设计了与民主相联系的“法治”蓝图的启蒙思想家是()
发育成熟前垂体前叶功能亢进可引起
痿证见手足痿弱,形体瘦削,肌肤甲错者为瘀血久留,可用
证券公司A接受期货公司B委托,协助B办理金融期货开户手续。中国证监会及其派出机构在对证券公司B进行日常监督检查时,发现其违反投资者适当性制度要求。证券公司A在办理金融期货开户手续时,应当()。
A公司2020年发生了如下经济业务:(1)发行债券100万份,扣除手续费后取得价款4900万元存入银行;(2)支付债券利息50万元;(3)以分期付款方式购建固定资产支付第一期价款50万元;(4)发行股票3000万股,取得价款30000万元存入银行
为什么说教学过程是一种特殊的认识过程?
中国共产党的性质决定了党的宗旨是全心全意为人民服务。检验党的一切执政活动的最高标准是
Wheredoesthemanwork?
TheIndianvultureismediuminsizeandbulky.Itsbodyandcovertfeathersarepale,itsquillsaredarker.Itswingsarebroad
A、Therelationbetweenhairandskin.B、Thegrowinginterestinskinstudies.C、Thecolorofhumanskin.D、Theneedofskinprot
最新回复
(
0
)