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
Mighty Flighty A fly can do one thing extremely well: fly. (86) Recently a team of British scientists declared that the comm
Mighty Flighty A fly can do one thing extremely well: fly. (86) Recently a team of British scientists declared that the comm
admin
2019-01-24
41
问题
Mighty Flighty
A fly can do one thing extremely well: fly. (86)
Recently a team of British scientists declared that the common housefly is the most talented aerodynamicist on the planet, superior to any bird, bat, or bee.
A housefly can make six turns a second; hover; fly straight up, down, or backward; do somersaults; land on the ceiling; and perform various other show-off maneuvers. And it has a brain smaller than a sesame seed.
Michael Dickinson, who studies fly flight in his lib at Cahech, says the housefly isn’t actually the best flier. ’Hoverflies are the be-all and end-all,’ he says. (87)
They can hover in one spot, hurtle through the air to another location, and then race back to their original hovering point precisely.
Scientists, engineers, and military researchers want to know how creatures with such small brains can do that. Maybe they could reverse-engineer a fly to make a robotic device that could reconnoiter dangerous places, such as earthquake zones or collapsed mines.
Dickinson’s laboratory works with fruit flies. Researchers put them in chambers and manipulate the visual field, filming the flies in super-slow motion, 6,000 frames a second. Dickinson is interested in knowing how flies avoid collisions. He has found that certain patterns, such as 90-degree turns, are triggered by visual cues and two equilibrium organs on their backs that function like a gyroseope.
Flies have only a dozen muscles for maneuvering, but they’re loaded with sensors. In addition to their compound eyes, which permit panoramic imagery and are excellent at detecting motion, they have wind-sensitive hairs and antennae. They also have three light sensors, called ocelli, on the tops of their heads, which tell them which way is up. Roughly two-thirds of a fly’s entire nervous system is devoted to processing visual images. They take all this sensory data and boil it clown to a few basic commands, such as ’go left’ and ’go right.’
(88)
Imagine if you didn’t utter an opinion until you had read hundreds of books, magazines, newspaper articles, and blogs, and then issued a statement based on a few basic notions. That’s how a fly approaches flying.
Only the fly is a speed reader. The information processing takes a fraction of a second. Researcher Rafal Zbikowski of Cranfield University in Shrivenham, England, calls this mode of operation a ’sensor-rich feedback control paradigm.’
(89)
Given that flies have evolved for hundreds of millions of years (and that they were the first animals to take to the air), we shouldn’t be surprised that they’re such good fliers.
’They just don’t have brains like ours. Studying flies,’ says Dickinson, ’is like traveling to another planet.’
选项
答案
假如苍蝇已经进化了数亿年(并且它们是最早存在于空气中的动物),那我们就不会为它们如此高超的飞行技能而惊叹了。
解析
(evolve进化,发展。hundreds of millions of years数亿年。take to适应,沉迷于。)
转载请注明原文地址:https://jikaoti.com/ti/ZKAMFFFM
本试题收录于:
B类竞赛(英语专业本科专科)题库大学生英语竞赛(NECCS)分类
0
B类竞赛(英语专业本科专科)
大学生英语竞赛(NECCS)
相关试题推荐
Cashrewardisacommonformofmotivationusedbyparentswithhighexpectationtoencouragetheirchildrenworkhardatexamt
Bydegreestheshutterswereopened:thewindow-blindsweredrawnup,andpeoplebeganpassingtoand【C1】______.Somefewstoppe
Bydegreestheshutterswereopened:thewindow-blindsweredrawnup,andpeoplebeganpassingtoand【C1】______.Somefewstoppe
Veryfewpeoplecanget【D1】______before11,butMichaelwasan【D2】______.Hestartedhighschoolwhenhewas5,finishinginjus
Doyoufindgettingupinthemorningsodifficultthatit’spainful?Thismightbecalledlaziness,butDr.Kleitmanhasanew
Yourclassrecentlyhadadiscussionabouttheimportanceofexerciseandsportforkeepingfit.Yourteacherhasnowaskedyou
ForgetLondon,ParisandMilan.ThelatestplaceforfashionableEuropeanstospendaweekendshoppingisMarrakech.Withcheapai
ForgetLondon,ParisandMilan.ThelatestplaceforfashionableEuropeanstospendaweekendshoppingisMarrakech.Withcheapai
ManyFuropeanuniversities,meanwhile,arestillmostlydependentongovernmentfunding.Butgovernmentsupporthasfailedtok
Lastweek,onBlackFriday,theTrumpadministrationtriedtoburyacongressionallymandatedreportontheconsequencesofclim
随机试题
( )是为数众多的综合性新闻或专题讨论组的总称,它也可以叫做新闻论坛。
以下不属于银行业从业人员职业操守所规定的银行业从业人员的是()。
甲企业成立于20×8年,主要从事A产品的生产和销售.适用的所得税税率为5%。3月10日购入价值200万元的设备,当日投入使用,预计使用年限为5年,无残值,企业采用年限平均法计提折旧,税法与会计折旧方法及净残值相同,税法规定的折旧年限为10年。甲企业当年实现
请认真阅读下文并按要求作答。颐和园北京的颐和园是个美丽的大公园。进了颐和园的大门,绕过大殿,就来到有名的长廊。绿漆的柱子,红漆的栏杆,
单位准备研发新产品,在新产品研发讨论会上,由于其中一组研发人员有不同意见,与其他小组成员发生争吵,现场非常混乱,你作为会议的主持人会如何处理?请现场模拟。
在一桩谋杀案审理中,徐警官推断:作案者要么是李华,要么是王伟,二者必有其一;所用作案工具或者是铁锹,或者是匕首,二者至少其一。如果徐警官的断定为真,则以下哪项推断一定成立?()Ⅰ.该案不是李华用铁锹所为。因此,一定是王伟用匕首所
Forhigh-riskpropositionsyieldinghighreturns,thereisnothingtobeatthehandfulcompaniesmarketingeternallife.(31)th
Livetheatrelives.InEnglandineverytown,someoneisrehearsing,someonedevising,some-oneperforming.Winchesterisagood
______onlyonemovingsoulinthecenterofalltheorbitsthatisthesunwhichdrivestheplanetsthemorevigorouslytheclos
Controlofmarketshareisthekeyissueinthiscasestudy.ThesituationisbothCokeandPepsiaretryingto【S1】______market
最新回复
(
0
)