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
A、They will have longer time to conserve energy. B、They will not need to migrate any more. C、They will have longer warmer period
A、They will have longer time to conserve energy. B、They will not need to migrate any more. C、They will have longer warmer period
admin
2014-06-30
37
问题
Winter is a pain in the animal kingdom. Birds can flee it by migrating to warmer regions but grounded beasts, including mammals, have no choice but to stick around.(23)To cope, many species have learned to spend the winter in a long sleep. Some, like the Columbian ground squirrel, spend up to nine months of each year in their shelters. This conserves energy but leaves them with only three months to become well-rounded for the next winter and, crucially, to reproduce.
To make matters worse, climate change is leading them to emerge from winter sleep later than usual.(24)Global warming should mean that the creatures have longer ice-free periods in which to go about their evolutionary tasks. But it can also disturb weather patterns, which may have the opposite effect.
Because female squirrels remain in their place of birth, the researchers were able to tag and observe them and their offspring each year for the past two decades. A typical female would bear three babies. On average, only 30% of them survive the first winter, enough to sustain population numbers since female squirrels can expect three or four litters in their lifetime. If the proportion falls, however, the population reduces.
In the first decade of the study the number of squirrels dropped just once. But it fell in four of the past ten years.(25)Dr. Lane, an evolutionary biologist at the University of Edinburgh, speculates that this might be explained by the fact that over the past 20 years the late snow has delayed the melting of ice by half a day each year, on average, shortening the squirrels’ breeding and feeding season by several days and disrupting their life cycles.
23. How do many species of animals spend the winter?
24. What should global warming mean to the animals?
25. What might explain the reduced squirrel population according to Dr. Lane?
选项
A、They will have longer time to conserve energy.
B、They will not need to migrate any more.
C、They will have longer warmer periods to reproduce.
D、They will have an increasing population.
答案
C
解析
文章中提到,全球变暖意味着动物度过更长久的不结冰的时期,从而完成进化的任务,故答案为C)。
转载请注明原文地址:https://kaotiyun.com/show/Wa17777K
0
大学英语六级
相关试题推荐
Itistruethattheworldfacesproblemsofpollution,butitcan______(通过全球的努力加以控制).
OnFoodSecurity1.食品安全丑闻频繁发生,引起人们关注2.食品安伞问题发生的原因3.我的看法
Knowledgemaybeacquiredthroughconversation,watchingtelevisionortravelling,butthedeepestandmostconsistentwayisth
Boysandgirlswhogrowupwithoutsiblings(兄弟姐妹)arenolesscapableofdevelopinggoodsocialskillsthanthoseraisedwithbro
ThinkorSwim:CanWeHoldBacktheOceans?Astheworldgetswarmer,sealevelsarerising.Ithasbeenhappeningatasnai
A、Housingandservices.B、Trafficandresources.C、Waterandelectricity.D、Pollutionandpopulation.A男士说,所有的大城市都面临相同的难题:房子和服务。
Oilisthesubstancethatlubricatestheworld’seconomy.Becausesomanyofourmoderntechnologiesandservicesdependonoil,
They’restillkids,andalthoughthere’salotthattheexpertsdon’tyetknowaboutthem,onethingtheydoagreeonisthatwh
Thehistoricdropindrivingthatbeganin2007andthedramaticdeclineintrafficjamthataccompaniedithaveended,accordin
Ifyou’rehappyandyouknowit,maybeyoureallyshouldclapyourhands.That’sbecausebeinghappymightmakeyoulivelonger.
随机试题
下列收入中属于基本业务收入的是()。
所有的行政许可事项申请人都可以委托代理人提出行政许可申请。()
在屏幕上显示输出a盘根目录下名为“string*txt”的文本文件读取的前20个字符组成的字符串。
19世纪法国空想社会主义者傅立叶发表过《全世界和谐》一文,最早提出“和谐社会”的概念,马克思批判吸收了空想社会主义理论中的有益思想,提出的未来和谐社会模式的具体设想是()
精神栖身于茅屋周国平①如果你爱读人物传记,你就会发现,许多优秀人物生前都非常贫困。就说说那位最著名的印象派画家凡高吧,现在他的一幅画已经卖到了几千万美元,可是,他活着时,他的一张画连一餐饭钱也换不回,经常挨饿,一生穷
影响药物吸收的主要生理因素有( )。
足月新生儿,第1胎,男,生后第3天,母乳喂养,生后24小时出现黄疸,皮肤黄染渐加重,实验室检查:Hb110g/L,母血型O,子血型B。若该患儿出现嗜睡、尖声哭叫、肌张力下降,胆红素上升至342μmol/L,该患儿可能发生了
洁净室及洁净区空气中悬浮粒子洁净度等级共划分为( )个等级。
公安人员张某在审讯犯罪嫌疑人高某时,对其捆绑吊打,致使高某脑内大面积出血而死亡。对张某的行为进行处罚的原则是()。
在VisualFoxPro中,要想将日期型或日期时间型数据中的年份用4位数字显示,应当使用设置命令()。
最新回复
(
0
)