首页
登录
职称英语
Why don’t birds (71) lost on their long flights from one place to another?
Why don’t birds (71) lost on their long flights from one place to another?
游客
2024-07-04
43
管理
问题
Why don’t birds (71) lost on their long flights from one place to another? Scientists have puzzled over this (72) for many years. Now they are beginning to fill (73) the blanks.
Not long ago, experiments (74) that birds rely on the sun to guide them (75) daylight, hours. But what about birds (76) fly by night? Tests with artificial stars have proved that (77) night - flying birds are able to follow the stars in their long - distance (78) A dove had spent its lifetime in a cage and had never flown under a (79) sky. Yet it showed a(n) (80) ability to use the stars for guidance. The bird’s cage was placed under a (n) (81) star - filled sky. The bird tried to fly in the position as that (82) by his outdoor cousins. Any (83) in the position of the make believe stars caused a change (84) the direction of his flight.
(85) think that doves, when flying in daylight, use the sun for (86) . But the stars are (87) their principal means of navigation. What do they do when the stars are (88) by clouds? Apparently, they find their way by such landmarks as (89) ranges, coast lines, and river courses. But when it’s too dark to see (90) , the doves circle helplessly, unable to get their bearing(方位). [br]
选项
A、People
B、Scholars
C、Experimenters
D、Scientists
答案
D
解析
科学家认为……。在四项选择中,Scientists为最佳选择,和第一段的科学家保持全文的称谓一致。
转载请注明原文地址:https://tihaiku.com/zcyy/3662835.html
相关试题推荐
Whydon’tbirds(71)lostontheirlongflightsfromoneplacetoanother?
Whydon’tbirds(71)lostontheirlongflightsfromoneplacetoanother?
Whydon’tbirds(71)lostontheirlongflightsfromoneplacetoanother?
Whydon’tbirds(71)lostontheirlongflightsfromoneplacetoanother?
Whydon’tbirds(71)lostontheirlongflightsfromoneplacetoanother?
Whydon’tbirds(71)lostontheirlongflightsfromoneplacetoanother?
Whydon’tbirds(71)lostontheirlongflightsfromoneplacetoanother?
Whydon’tbirds(71)lostontheirlongflightsfromoneplacetoanother?
Whydon’tbirds(71)lostontheirlongflightsfromoneplacetoanother?
Allofuscommunicatewithoneanotherverbally(口头的)aswellasnon-verball
随机试题
Yunnan______inthesouthwestofChina.A、islocatedB、locatesC、islocatingD、loc
AscottInternationalisthelargestservicedresidentialoperatorinthewor
Manyanimalandevenplantspeciescommunicatewitheachother.Humansaren
DearSirorMadam,Manythanksforyourletter.Wearegladtohearthatyou
下列哪个陈述最好地描述了对审计工作底稿的审查可能帮助内部审计人员的职业发展?A.
外资银行分行能够在中国经营的业务()。A.与境内法人银行的经营范围一致 B.
一项目质量、进度、投资控制编码的基础是()及其编码。A.项目合同图 B.
A.真空干燥B.冷冻干燥C.喷雾干燥D.鼓式干燥E.红外干燥常用于血清、抗生素等
以下是组合电器的例行巡视的内容是()设备出厂铭牌齐全、清晰$;$运行编号标
男,60岁。腹胀6天,伴轻度腹痛,偶有呕吐。近4天肛门停止排气排便,半个月前曾患
最新回复
(
0
)