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
2024-03-07
54
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 than 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
由原文可知,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:https://tihaiku.com/zcyy/3513608.html
相关试题推荐
[originaltext]Hereisaquestionforyou.Thecustomerisalwaysright.Rig
[originaltext]Hereisaquestionforyou.Thecustomerisalwaysright.Rig
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreat
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreat
[originaltext]MedicalexpertssaymostAmericansdonotgetenoughsleep.T
[originaltext]TheWorldHealthOrganizationsays57nationsinSouthernAfr
[originaltext]TheWorldHealthOrganizationsays57nationsinSouthernAfr
[originaltext]TheWorldHealthOrganizationsays57nationsinSouthernAfr
[originaltext]W:WhatdoyouthinkofTV?Ithinkitisafalsegod,adang
[originaltext]W:WhatdoyouthinkofTV?Ithinkitisafalsegod,adang
随机试题
Esperantoisanartificiallanguage,designedtoserveinternationallyasan
对全身起控制和协调作用的系统有()A.神经系统 B.循环系统 C.免疫系统
对待客户投诉,正确的情绪控制技巧有()。A.我需要知道事情的经过和真相,所
根据《优先股试点管理办法》,下列事项中优先股股东有权出席并表决的有()。 Ⅰ
端子箱及检修电源箱验收细则中,要求端子箱柜门应卷出(____)槽。顶上采用屋檐式
A. B.2 C. D.0
某房地产开发项目的总开发成本为2600万元,竣工后的销售收入为4500万元,销售
引起肛瘘最常见的病因是 A.便秘B.溃疡性结肠炎C.肛裂D.直肠肛周脓肿
程序计数器的作用是存放()。A.下一条要执行的指令地址 B.当前正在执行的
下列有关蛋白质生物合成的叙述中错误的是A.氨基酸的羧基端被活化 B.活化的氨基
最新回复
(
0
)