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
24
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
"OntheInternet,nobodyknowsyou’readog,"readthetitleofafamousPet
2009年1月1日,X企业向Y保险公司足额投保了企业财产险和利润损失险,X企业2
根据《建筑施工扣件式钢管脚手架安全技术规范》(JGJ130),工程项目部专职安全
美国某投资机构预计美联储将降低利率水平,而其他国家相关政策保持稳定,决定投资于日
39、社会主义文艺是人民的文艺,必须()的创作导向,在深入生、扎根人民中
护士∶输液A.策划∶文案 B.园丁∶教师 C.主持人∶晚会 D
下列不能用来作为火灾自动报警系统的传输线路保护的是()。A.金属管 B.可
D
违约概率是事后检验的结果。()
破伤风梭菌的芽胞在土壤中最长可存活A.数十年 B.十余年 C.数年 D.数
最新回复
(
0
)