首页
登录
职称英语
[originaltext] Thefiddler crab ( 招潮蟹) is a living clock. It indicates the ti
[originaltext] Thefiddler crab ( 招潮蟹) is a living clock. It indicates the ti
游客
2023-09-12
15
管理
问题
Thefiddler crab ( 招潮蟹) is a living clock. It indicates the time of day by the color of its skin, which is dark by day and pale by night. The crab’s changing skin color follows a regular 24-hour cycle that exactly matches the daily rhythm of the sun.
Does the crab actually keep time, or does its skin simply respond to the sun’s rays, changing color according to the amount of light that strikes it? To find out, biologists kept crabs in a dark room for two months. Even without daylight, the crabs’skin color continued to change precisely on schedule.
This characteristic probably evolved in response to the rhythm of the sun, to help protect the crab from sunlight and enemies. After millions of years it has become completely regulated inside the living body of the crab.
The biologists noticed that once each day the color of the fiddler crab is especially dark, and that each day this occurs 50 minutes later than on the day before. From this they discovered that each crab follows not only the rhythm of the sun but also that of the tides. The crab’s period of greatest darkening is precisely the time of low tide on the beach where it is caught.
选项
A、To tell the crab what time it is.
B、To protect the crab from the sunlight and enemies.
C、To keep the crab warm.
D、To be of no real use.
答案
B
解析
事实细节题 文中谈到招潮蟹的肤色随时间变化是为了保护自己避开阳光和敌人的伤害。
转载请注明原文地址:https://tihaiku.com/zcyy/3008743.html
相关试题推荐
[originaltext]M:Iwouldliketosendane-mailtoafriendofmine.Couldyou
[originaltext]M:Iwouldliketosendane-mailtoafriendofmine.Couldyou
[originaltext]HowdoAmericanhusbandsfeelabouthavingworkingwives?Many
[originaltext]HowdoAmericanhusbandsfeelabouthavingworkingwives?Many
[originaltext]HowdoAmericanhusbandsfeelabouthavingworkingwives?Many
[originaltext]W:ProfessorMarnes,Iwonderifyoucanfillmeinonyourlectu
[originaltext]W:ProfessorMarnes,Iwonderifyoucanfillmeinonyourlectu
[originaltext]W:ProfessorMarnes,Iwonderifyoucanfillmeinonyourlectu
[originaltext]WhenlittleMidoriwastwoyearsold,sheoftenClimbedontot
[originaltext]WhenlittleMidoriwastwoyearsold,sheoftenClimbedontot
随机试题
Thefirstparagraphisintendedto______.[br]Paragraphs2and3explain_____
Manycriticsconsiderthatfarmorestressisplacedonachievementsinat
Wisebuyingisapositivewayinwhichyoucanmakeyourmoneygofurther.T
发达资本主义国家战后经济较为快速、平稳发展的原因包括()A.科技革命的作用 B
下列系统中,属于会计软件功能结构的有()。A.账务处理模块 B.固定资产核算模
桥梁用金属波纹管外观及规格尺寸检测项目包括()。A、外观 B、内外径 C、
Thechangeinthatvillagewasmiraculou
“民为贵,社稷次之,君为轻”这一思想的提出者是()。A.苟子 B.墨子
A.医师在执业活动中,人格尊严、人身安全不受侵犯 B.医师不得使用未经批准使用
(2021年第1批真题)在明挖基坑外进行地基加固的目的包括( )。A.止水
最新回复
(
0
)