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
2023-08-05
77
管理
问题
Winter is a pain in the animal kingdom. Birds can flee it by migrating to warmer regions but land beasts, including mammals, have no choice but to stick around. To cope with it, 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 man usual. Global warming means that creatures have longer ice-free periods 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. 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.
Questions 13 to 15 are based on the passage you have just heard.
13.How do many land animals spend the winter according to the passage?
14.What does global warming mean to animals?
15.What might explain the reduced squirrel population according to Dr. Lane?
选项
A、They sleep for a long time.
B、They migrate to warmer areas.
C、They eat more food to keep warm.
D、They store up food for the next year.
答案
A
解析
短文开头提到,为了应对寒冷的冬天,许多陆栖动物学会了通过冬眠来度过冬季。因此答案为A)。
转载请注明原文地址:http://tihaiku.com/zcyy/2900326.html
相关试题推荐
鼠相貌猥琐,鬼鬼祟祟,破坏力强,落得个“老鼠过街,人人喊打”的千古骂名。但它居于中国十二生肖(thetwelvesymbolicanimals)之首,
[originaltext]W:OK,I’vegotallthepaperworkhereforyourapplication.Every
[originaltext]W:OK,I’vegotallthepaperworkhereforyourapplication.Every
[originaltext]W:OK,I’vegotallthepaperworkhereforyourapplication.Every
[originaltext]W:OK,I’vegotallthepaperworkhereforyourapplication.Ever
[originaltext]W:OK,I’vegotallthepaperworkhereforyourapplication.Ever
[originaltext]W:OK,I’vegotallthepaperworkhereforyourapplication.Ever
[originaltext]W:OK,I’vegotallthepaperworkhereforyourapplication.Ever
[originaltext]M:ItsaysherethatyougraduatedfromUniversityofPennsylvani
[originaltext]M:ItsaysherethatyougraduatedfromUniversityofPennsylvani
随机试题
Theproductdemonstrationslasted______about2hours,andtheyseemedtobeagr
[originaltext]W:Goodmorning,Mr.Pitt.Dositdown.M:Thankyou.W:Firstof
WhySustainableBuildingsNeedtoFocusonCommunityAndCollaboration?
关于银行间市场交易方式,下列说法正确的有()。 ①询价交易方式是指交易双方自
A.藤茎B.茎髓C.含有树脂的木材D.心材E.茎枝川木通的入药部位是
A,逆时针旋转,一个每次3格,一个每次2格
试问,在柱与基础的交接处,冲切破坏锥体最不利一侧斜截面的受冲切承载力(kN)
某银行于2016年4月份购买了A公司五百万元人民币应收账款,这属于()业务。A
先有一个目标,当人们认识到它与当前状态之间存在着差异时,就要想出办法,采取活动
根据《行政强制法》的规定,下列关于查封、扣押的说法中正确的有( )。A.对查封、
最新回复
(
0
)