首页
登录
职称英语
[originaltext] The fiddler crab is a living clock. It indicates the time of
[originaltext] The fiddler crab is a living clock. It indicates the time of
游客
2023-09-12
50
管理
问题
The fiddler crab is a living clock. It indicates the time of the 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 twenty-four 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 crab’s skin color continued to change precisely on schedule.
The 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 fiddle crab is especially dark, and that each day this occurs fifty 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 was caught.
选项
A、They changed color more quickly.
B、They did not change color.
C、They changed color on the same schedule.
D、They changed color more slowly.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3008231.html
相关试题推荐
[originaltext]M:Isthatamap?Areyougoingsailingorsomething?W:Iwish.
[originaltext]M:Isthatamap?Areyougoingsailingorsomething?W:Iwish.
[originaltext]M:MayIaskwhereAnne’sClothingStoreislocated?W:Ofcourse
[originaltext]M:MayIaskwhereAnne’sClothingStoreislocated?W:Ofcourse
[originaltext]M:MayIaskwhereAnne’sClothingStoreislocated?W:Ofcourse
[originaltext]M:MayIaskwhereAnne’sClothingStoreislocated?W:Ofcourse
[originaltext]JoeSmithhadbeenbroughtupinanorphanage.Heenviedpeop
[originaltext]JoeSmithhadbeenbroughtupinanorphanage.Heenviedpeop
[originaltext]Yogabecomesverypopularnowadays,butitisimportantthat
[originaltext]W:Thisfoodisterrible!Ican’tevenfinishmydinner.M:Ikno
随机试题
Thepioneers’greatestassetwasnottheirmaterialwealthbuttheir______.A、fo
TheLostArtofListeningA)"Whywon’theevenlistentomyidea?""Why
十面埋伏:韩信A.鸡鸣狗盗:春申君 B.指鹿为马:秦桧 C.口蜜腹剑:李林甫
根据下面资料,回答 Igrewupseeinghandwritten
患者,男,41岁。久泻脱肛,体倦肢软,自汗出,渴喜热饮,少气懒言,舌淡苔薄白,脉
共用题干 第三篇TheScienceoftheFutureUntil
根据以下材料,回答93-96题 某企业拟开发一种新产品,需要资本总额为1000
下列选项中,属于镇区控制性详细规划主要内容的是()。A.进行竖向规划设计以及
下列选项中,属于我国法的正式解释的有()。A.立法解释 B.行政解释 C.
最新回复
(
0
)