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
31
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、change
B、time
C、chance
D、moment
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3662833.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
WhenshefirstcametoFrancefromBulgaria,shewashardlythe______studentshe
Anabbreviation(缩写词)canbedefinedasashortenedformofawordorterm.
机动车在高速公路上发生故障或交通事故无法正常行驶时应由什么车拖曳或牵引?()A
关于随机误差与系统误差的不同,下列说法正确的是()。A.都有确定的界限
A.下颌后退 B.下颌偏向一侧 C.前牙开 D.前伸时脱落 E.侧向非功
患儿,男,8岁,咳嗽流涕3天,T39℃,咽充血,右肺背下方呼吸音降低,未闻及啰音
完善大学生的自我意识,我们可以采取的措施是()A.为大学生树立榜样 B.
感染艾滋病病毒到发病,一般潜伏期为A.6个月 B.2~10年(平均5年) C
A.葛根B.络石藤C.大黄炭D.荷叶E.山药饮片应放在斗架高层的是
慢性盆腔炎病变主要存在于A.子宫内膜及输卵管 B.子宫旁结缔组织及输卵管 C
最新回复
(
0
)