首页
登录
职称英语
Why don’t birds get lost on their long flights from one place to anothe
Why don’t birds get lost on their long flights from one place to anothe
游客
2024-07-12
17
管理
问题
Why don’t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for a long time.Now they’re starting to fill in the blanks.
Not long ago, experiments showed that birds use the sun to guide them during daylight hours.How do birds fly at night? Tests with artificial stars have proved that certain night-flying birds are able to follow the stars in their long-distance flights.
A dove had spent its lifetime in a cage and had never flown under a natural sky.But it had an inborn ability to use the stars for guidance.The bird’ s cage was placed under an artificial star-filled sky.The bird tried to fly in the same direction as that taken by his outdoor cousins.Any change in the position of the artificial stars caused a change in the direction of his flight.
But the stars are apparently their main means of navigation.When the stars are hidden by clouds, they apparently find their way by such landmarks as river courses, mountain ranges, coast lines.But when it’ s too dark to see these things, the doves circle helplessly, unable to find their way. [br] By "his outdoor cousins" the author means________.
选项
A、other experimenters
B、the other doves of the same brood
C、doves under the natural sky
D、other birds in general
答案
C
解析
A项“其他实验者”,B项“其他同一窝的鸽子”;C项“在自然天空下飞行的鸽子”;D项“其他鸟类”。根据题意,C为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3674177.html
相关试题推荐
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Scient
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Scient
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Sc
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Sc
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Sc
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
随机试题
[originaltext]TheWorldHealthOrganizationsaysalcoholabuseisthethird
Theconceptofmanversusmachineisatleastasoldastheindustrialrevol
Questions1-8Completethesummarybelow.ChooseONEorTWOWORDSfromthepassa
为了提升市场竞争地位,某汽车制造企业成立跑车事业部,投资研发运动型硬顶敞篷跑车,
热传导是固体物质被部分加热时内部的传热形式。
在精神分裂症的病因学研究中,目前认为最重要的因素是A.脑萎缩 B.生化因素
患者妊娠2个月。食少便软,面色萎白,语声低微,四肢乏力,舌质淡,脉细缓。治疗应首
患者女,36岁。1周前有上呼吸道感染病史,突发颈部肿物伴疼痛1天,疼痛掣引耳后枕
16PF测验的题目形式是()。单选A.是非式 B.折中是非式 C.选
根据《企业会计准则——基本准则》规定,会计期间分为年度和中期,其中期可分为(
最新回复
(
0
)