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
One of Nature’s most exciting mysteries is how pigeons find their way home over vast distances. Now German scientists believe th
One of Nature’s most exciting mysteries is how pigeons find their way home over vast distances. Now German scientists believe th
admin
2019-02-10
32
问题
One of Nature’s most exciting mysteries is how pigeons find their way home over vast distances. Now German scientists believe they have discovered how the birds do it. Research has revealed that tiny iron structures in their beaky(鸟嘴)allow them to analyze the earth’s magnetic field—much like a compass(罗盘). Through the signals picked up, the birds can work out where they are and set out on the best course home.
As well as pigeons, many other birds display a remarkable ability to fly thousands of miles to return to a specific garden or tree year after year. Scientists are suggesting they may have similar iron-containing cells in their beaks.
In the past, experts have suggested the birds use the sun and stars to navigate, although in 2004 researchers found that many follow roads rather than their internal compass to plan their route. However, scientists have long believed that they can in some way use the natural magnetism of the earth to navigate. The recent study by German scientists has revealed how this may be possible.
The research used X-rays to examine the upper beaks of pigeons. They found that within the skin lining are tiny iron-containirg particles(微粒)in nerve branches which are arranged in a 3D pattern. The team, led by Gerta Fleissner, concluded that this allows the birds to react to the external magnetic field of the planet and work out their precise location.
She pointed out that similar iron-containing cells had been found in the beaks of robins, warblers and chickens so it may well turn out to be the way that other species also navigate.
Scientists are still discovering more about the incredible abilities of the pigeon.
Questions:
In 2004 some researchers found that many birds do not______to plan their route.
选项
答案
use their internal compass
解析
转载请注明原文地址:https://kaotiyun.com/show/fR5K777K
本试题收录于:
浙江省大学英语三级题库大学英语三级分类
0
浙江省大学英语三级
大学英语三级
相关试题推荐
Translatorsarepeoplewhoreadbooksforus.TolstoywroteinRussian,sosomeonemustreadhimforusandthenwritedownthat
Likeitornot,EnglishisthelinguafrancaofEurope.Accordingtothe【D1】________,some84percentofyoungpeopleintheECa
Thefirstthingpeoplerememberaboutfailingatmathisthatitfeltlikesuddendeath.Whethertheincidentoccurredwhilelea
Mostofthepeoplewhoappearmostoftenandmostgloriouslyinthehistorybooksaregreatconquerorsandgeneralsandsoldiers
A19thCenturyKillerDisease:TuberculosisIn1882,RobertKoch,aGermancountrydoctor,succeededinisolatingthebacill
Thereisprobablynolimittowhatsciencecandointhewayofincreasingpositiveexcellence.(81)Healthhasalreadybeengre
Thereisprobablynolimittowhatsciencecandointhewayofincreasingpositiveexcellence.(76)Healthhasalreadybeengrea
Thereisprobablynolimittowhatsciencecandointhewayofincreasingpositiveexcellence.(76)Healthhasalreadybeengrea
Theautomobilehashadaprofoundeffectonmodernlife.Someoftheseeffectshavebeenpositiveandothersnegative.Detailth
Itisnocoincidencethatthedevelopmentoftherelationshipbetweenourcountrieshasaccompaniedaperiodofpositivechange.
随机试题
上层建筑对经济基础的反作用,集中表现为对经济基础的()
哮喘性支气管炎的治疗原则应包括()
采用哥特式弓描记法确定无牙颌颌位关系时,当描记针位于哥特式弓形描记轨迹尖端时下颌处于
猪肉大葱馅饺子,其中猪肉含量30%,净重500g
证券公司向客户收取的佣金标准为不得高于证券交易金额的()。
在营业部经纪业务主要环节的操作规程方面,证券账户管理包括()等内容。Ⅰ.证券账户的开立Ⅱ.证券账户注册资料的查询Ⅲ.证券账户挂失补办Ⅳ.非交易过户
【2013山东省属】根据课程内容的组织形式,可以把课程类型分为()。
甲公司向乙公司购买一批货物,价值100万元,合同中约定甲公司先预付货款35万元,其余的65万元货款在提货后一年之内付清。甲公司要求丙公司为其提供连带担保,没有约定保证范围。提货1个月后,甲公司在征得乙公司同意后,将65万元的债务转移给欠自己70万元货款的丁
设y=y(χ)由确定,求
—Whichdressdoyoulikebetter?—Iliketheblue______better,itseems.
最新回复
(
0
)