首页
登录
职称英语
[originaltext] Winter is a pain in the animal kingdom. Birds can flee it by
[originaltext] Winter is a pain in the animal kingdom. Birds can flee it by
游客
2023-08-25
67
管理
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、The squirrels’ breeding season is extended.
B、The female squirrels’ productivity falls.
C、The squirrels’ survival rate reduces.
D、The squirrels’ life cycles are disrupted.
答案
D
解析
文章末尾提到,爱丁堡大学的进化论生物学家莱恩博士推测,这一现象可能是由于过去的20年里,迟来的雪将冰的融化平均每年延迟半日,缩短了松鼠的繁殖和喂养季节,打乱了它们的生活周期,故答案为D)。
转载请注明原文地址:https://tihaiku.com/zcyy/2955057.html
相关试题推荐
[originaltext]Itravelalot,andIfindoutdifferent"style"ofdirection
[originaltext]Itravelalot,andIfindoutdifferent"style"ofdirection
[originaltext]Itravelalot,andIfindoutdifferent"style"ofdirection
[originaltext]AskatypicalAmericantonamethebiggestbusinessintheUn
[originaltext]W:Haveyoueverattendedagroupinterview?Imeananinterview
[originaltext]W:Haveyoueverattendedagroupinterview?Imeananinterview
[originaltext]W:Haveyoueverattendedagroupinterview?Imeananinterview
[originaltext]W:Tellmealittlebitaboutyourself,please.M:MynameisDav
[originaltext]W:Tellmealittlebitaboutyourself,please.M:MynameisDav
[originaltext]W:YouAmericansarefunny.Itseemsasifyouweremarriedwith
随机试题
[originaltext]M:Hello,WilliamSmith’sspeaking,whatcanIdoforyou?W:Hel
UKNewspapersI.Introduction—manynationalnewspapers—nonational【T1】______
建设单位在工程竣工验收合格之日起15日内未办理工程竣工验收备案的,备案机关责令限
已知某公司当前资金结构如下: 因生产发展,公司年初准备增加资金2500万元
2020年1-10月,我国规模以上互联网和相关服务企业(简称互联网企业)完成业务
在依法收贷中,债务人应当自收到支付令之日起()日内向债权人清偿债务,或者向人民
昆布与海藻均有的功效是A.消痰软坚、清心定惊 B.消痰软坚,利水消肿 C.消
在工程建设设计进度控制计划体系中,需要考虑设计分析和评审的工作时间安排的进度计划
A. B. C. D.
下列施工作业内容中,需要编制施工方案的有()。2017A.大型设备吊装 B.支
最新回复
(
0
)