首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Why don’t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for many ye
Why don’t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for many ye
admin
2014-10-11
86
问题
Why don’t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for many years. Now they’re beginning to fill in the blares.
Not long ago, experiments showed that birds rely on the sun to guide them during daylight hours. But what about birds that 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. Yet it showed 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 principal means of navigation. When the stars are hidden by clouds, they apparently find their way by such landmarks as mountain ranges, coast lines, and river courses. But when it’s too dark to see these, the doves circle helplessly, unable to find their way.
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
谈到动物时,cousins(表兄弟,表姐妹)一词常指它的同类。“his outdoor cousins”意指笼子外的那些鸽子。
转载请注明原文地址:https://www.kaotiyun.com/show/ZwMK777K
本试题收录于:
大学英语三级B级题库大学英语三级分类
0
大学英语三级B级
大学英语三级
相关试题推荐
Thefollowingisaletterofrecommendation.Afterreadingthem,youarerequiredtocompletetheanswersthatfollowthequesti
Readthefollowingpassage.Afterreadingit,youshouldcompletetheinformationbyfillingintheblanksmarked46to50inn
TheweatherinBeijingissodrythatIcanhardlyadjust______lifethere.
EverychildexpectedTommy(reward)______forgoodbehavioryesterday.
HolidayHomesinMallorcaHolidayapartmentsinMallorcasailingandfishingport—quieteveninsummerseason.Beautifulroo
Youaresupposed(lock)______theroombeforeyouleavethelanguagelab.
A、Bobwillhelp.B、Bobisunkind.C、Bobwantsmoney.D、Bobcan’thelp.A女士说的“warm-hearted”意为”热心肠的”,故选A,”Bob会帮忙的。”
I’veworkedwithchildrenbefore,soIknowwhat______inmynewjob.
Youcangetfree,fairandexpertadviceaboutmakingyourhomemoreenergyefficientfromyourlocalEnergySavingTrustadvice
Christmaswascoming.AmywantedaspecialgiftfromSantaClaus,soshewrotetothenewspaper:DearSantaClaus,Mynameis
随机试题
下列关于线性链表的叙述中,正确的是
TXA2减少常见于
A、20(S)-原人参二醇B、20(R)-原人参二醇C、人参二醇D、20(S)-原人参三醇E、人参三醇A型人参皂苷经酸水解后得到()
[2004年第117题]住宅厨房与卫生间的门如不设固定百叶,应留有一定进风措施,门下距地留出的缝隙不小于:
甲企业为危险化学品生产经营单位,2017年6月与乙企业签订了工厂机械、管道类检修维护服务合同,双方约定,乙企业为甲企业的位于某县化学工业园区内的乙烯裂解综合装置中相关工厂提供机械、管道类日常维护修理服务。该合同所包含的健康安全环境条款规定,乙企业为甲企业的
岁暮杜甫岁暮远为客,边隅还用兵。烟尘犯雪岭,鼓角动江城。天地日流血,朝廷谁请缨?济时敢爱死?寂寞壮心惊!这首诗使用了多种表达技巧,请举出两种并作赏析。
能够使用“输入掩码向导”创建输入掩码的字段类型是______。
I______tocatchthe2:00plane,butnosuchluck.
Whendid"TheOprahWinfreyShow"becomenationallypopular?
ReadingEfficientlybyReadingIntelligentlyUsinggoodreadingstrategies,youcangetthemaximumbenefitfromyourreadingw
最新回复
(
0
)