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
22
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.
According to the passage, which of the following statements is TRUE?
选项
A、Starving polar bears are increasingly coming into villages, where they may be killed either for food or safety.
B、Polar bears can spend their entire lives on land if the sea ice melts completely.
C、Two-thirds of the world’s polar bears may disappear by 2050 as global warming continues.
D、The growing distance between ice packs is not a problem for polar bears, because they are excellent swimmers.
答案
C
解析
根据文章第二段最后两句:专家说如果温室效应持续下去,到2050年北极将没 有夏季海冰.那也将导致世界上2万只北极熊中的2/3死亡。可知选择C。
转载请注明原文地址:https://kaotiyun.com/show/2FCO777K
0
成人本科学位英语
相关试题推荐
Forthispart,youareallowed30minutestowritealettertoaneditorofanEnglishnewspaper.Youshouldwriteatleast100
Withoutthefriction(摩擦力)betweentheirfeetandtheground,peoplewould______beabletowalk.
Thesepeopleoncehadfameandfortune;now______islefttothemisonlypoverty.
Ineverycultivatedlanguagetherearetwogreatclassesofwordswhich,takentogether,comprisethewholevocabulary.First,t
Evenachildknowsthatnoddingheadmeans"Yes".ButsomepeopleWouldprobably【C1】______whentheyfirstcametoIndia.Whenth
Hefinishedreadingandwenton______acomposition.
(Neverbefore)(hehad)felthimself(so)powerfully(attracted)tothescientificideal.
Areyouplanningavacation?Ifyoulikehotandextremelydrysummers,gotoPhoenix,Arizona.Forhottemperaturesbutlotsof
Lodger:I’mterriblysorrythatIbrokeyourteacup.I’llpayforit.Landlady:______
我的工作是帮助人们实现他们的梦想。
随机试题
A.胰岛素治疗B.二甲双胍口服C.格列齐特(达美康)口服D.单纯饮食控制男性,45岁。口干,多尿、多饮2个月,胃纳亢进明显。身高175cm,体重85kg。空腹血糖8.7mmol/L,餐后2小时血糖13.1mmol/L。该患者最佳治疗选择是
诊断智力低下的IQ值一般应
患者,女,47岁。咳嗽月余,加重周,咳引胸胁疼痛,痰少而稠,面赤咽干,舌苔黄少津,脉弦数。治疗应首选
社会工作价值观是社会工作者所持有的助人观念,是利他主义,尊重受助者的权力和选择。它认为社会工作是一种真正的服务过程,而不是社会工作者在行使手中的权力。根据上述定义,下列不属于社会工作价值观的是()
某商厦增建钢结构入口大堂,其屋面结构布置如图17—23(Z)所示,新增钢结构依附于商厦的主体结构。钢材采用Q235B钢,钢柱GZ-1和钢梁GL-1均采用热轧H型钢H446×199×8×12制作,其截面特性为:A=8297mm2,Ix=28100×104m
A公司是甲市乙县一以生产新材料为主的高新技术企业,新建2×104t/a改性型胶粘新材料联产项目。该联产项目主要装置有混二硝基苯装置及配套废酸处理装置,煤制氢装置,苯二胺装置等;主要原料有苯、硝酸、硫酸等;主要产品为间苯二胺、邻苯二胺、对苯二胺等:主要工艺流
通风与空调施工中,安装单位应承担的协调配合工作有()。
无效合同的双方都有过错,对返还财产后的损失赔偿,应各自承担相应责任。所谓“相应责任”的含义是()。
根据《中华人民共和国未成年人保护法》的规定,对违法犯罪的未成年人坚持()的原则。
"Yearsago,afriendofmineobservedthat80percentofthepeopleinthiscountryhavetoomuchself-esteemand20percenthav
最新回复
(
0
)