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
A blind baby is doubly handicapped. Not only is it unable to see, but because it cannot receive the visual stimulus from its env
A blind baby is doubly handicapped. Not only is it unable to see, but because it cannot receive the visual stimulus from its env
admin
2021-10-20
51
问题
A blind baby is doubly handicapped. Not only is it unable to see, but because it cannot receive the visual stimulus from its environment that a sighted child does, it is likely to be slow in intellectual development. Now the ten-month old son of Dr. and Mrs. Dennis Daughters is the subject of an unusual psychological experiment designed to prevent a lag in the learning process. With the aid of a sonar-type electronic that he wears on his head, infant Dennis is learning to identify the people and objects in the world around him by means of echoes.
The device is a refinement of the "Sonicguide", an instrument produced by Telesensory Systems, Inc., of Palo Alto, Calif., and used by blind adults in addition to a cane or guide dog. As adapted for Dennis, it consists of a battery-powered system about the size of a half dollar that is on a headgear. A transmitter emits an ultrasonic pulse that creates an 80 degree cone of sound at 6 feet. Echoes from objects within the cone are perceived as sounds that vary in pitch and volume with the size and distance of the object.
The closer an object is, the lower the pitch, and the larger the object, the louder the signal. Hard surfaces produce a sharp ping, while soft ones send back signals with a slighdy fuzzy quality. An object slightly to the right of Denny’s sends back a louder sound to his right ear than to the left. Thus, by simply moving his head right and left and up and down, he can not only locate an object but also get some notion of its shape and size, thanks to the varying qualities of sounds reaching his ears as the cone of ultrasound passes
its edges
. Dennis likes to use the device to play a kind of peek-a-boo with his mother. Standing on her knee and facing her directly, he receives a strong signal in both ears. By turning his head away, he makes her seem to disappear. "From the first time he wore it," says Mrs. Daughters, "it was like a light going on in his head."
What remains to be determined is how well the device will help Dennis cope with his surroundings as he begins to walk and venture further into his environment. Meanwhile, Telesensory, Inc. is working on the development of sonar device with somewhat the same sensitivity as Dennis’s for use by school-age children.
In the 5th line of the third paragraph, "its edge" refers to _______.
选项
A、the edge of an object
B、the edge of the device
C、the boundary of Dennis’ movement
D、the boundary of the sound pitch
答案
A
解析
第3段第4句中的thanks to表明此处解释了Dennis的声纳定位仪的运作机制,即通过声波描绘物体的形状,该句中the cone指的就是该定位仪,而its edge应指周围物体的边缘,当声波碰到物体的边缘时.就能通过声音描绘出物体的形状了,因此本题答案应为A。
转载请注明原文地址:https://kaotiyun.com/show/i5tK777K
0
专业英语四级
相关试题推荐
TheBBChaslongdominatedBritain’smedia,andinrecentyearsithasgotevenbigger.Manylocalnewspapersaredying.Thetec
Animalsarelivingcreaturesandmostofusoftenforgetaboutit.Althoughtheycan’tspeakourlanguage,theycanunderstandu
ItiscommonlybelievedthatintheUnitedStatesschooliswherepeoplegetaneducation.Nevertheless,ithasbeensaidthatt
A.clinicalB.communicationC.compromisesD.criticallyE.eliminateF.frankG.involvesH.judgements
A.clinicalB.communicationC.compromisesD.criticallyE.eliminateF.frankG.involvesH.judgements
Itcanbetemptingtomakeahastydecisionwhenakilleropportunitycomesalongorthethoughtofspendinganotherdayonthe
Theoceanbottom—aregionnearly2.5timesgreaterthanthetotallandareaoftheEarth—isavastfrontierthateventodayis
A、From6:30to9:00onTuesdays.B、From6:30to9:30onMondayevenings.C、From2:00to4:30onTuesdays.D、From2:00to4:30on
Heplannedtostealthemoney,buthis______werediscovered.
PASSAGETHREEWhydocynicsregardfootballas"adangertothepeaceofSouthAmerica"’!
随机试题
在实际工作中,践行诚信职业道德规范,必须()。
PHA受体表达在C3b受体表达在
A.氯氮平B.苯巴比妥C.阿米替林D.苯妥英钠E.卡马西平属于二苯并庚二烯类的是()。
证券发行市场的组成部分是()。
现年45岁的李先生决定自今年起每年过生日时将100130元存入银行直到60岁退休;假定存款的利率是3%并保持不变,则退休时李先生将拥有多少银行存款可用于退休养老之用?()
社会工作者在进行社区教育宣传时,应注意符合宣传对象的()。
陶澍,字云汀,湖南安化人。嘉庆七年进士,选庶吉士,授编修,迁御史、给事中。澍疏劾河工冒滥,及外省吏治积弊。巡南漕,革陋规,请浚京口运河。二十四年,出为川东道。总督蒋攸铦荐其治行为四川第一。道光三年,陶澍就擢巡抚。安徽库款,五次清查,未得要领。澍自
童年期的主要活动是()。
Whydoescreamgobadfasterthanbutter?Someresearchersthinktheyhavetheanswer,anditcomesdowntothestructureofthe
简述不安抗辩权的构成要件。(2014年一专一第53题)
最新回复
(
0
)