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
73
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
Inasense,thenewprotectionismisnotprotectionismatall,atleastnot
Thesentence"IvoteH-A-M-B-U-R-G-E-R"violatesthemaximofA、quantity.B、quali
Cheatingisnothingnew.Buttoday,educatorsandadministratorsarefinding
对于线型光束感烟火灾探测器选择反射式探测器时,应保证在反射板与探测器间任何部位进
以下关于肝药酶的描述不正确的是:A.特异性高 B.在药物间容易发生竞争性抑制
日本农协以其( )成为世界各国农业合作的成功典范。A.农户参加的普遍性 B.
项目社会评价中对“居民就业影响的分析预测”属于() A.社会风险分析B
在高土壤电阻率地区,在发电厂和变电站多少米以内有较低电阻率的土壤时,可敷设引外接
(2021年第1批真题)下列施工现场动火作业中,属于一级动火作业等级的有( )
结核性腹膜炎的抗结核治疗,下列哪项不正确A.其疗效一般比溃疡型肠结核略好 B.
最新回复
(
0
)