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
2014-01-07
89
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 sane 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 slightly 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.
Dr. and Mrs. Daughters’ research is directed to
选项
A、helping the blind to see and learn as well as others.
B、facilitating the learning process of blind children.
C、solving blind children’s psychological problems.
D、finding out how children develop intellectually.
答案
B
解析
首段第3句末的不定式to prevent a lag in the learning process表明了Daughters夫妇研究的目的,另外,文章一开头就提到了本文讨论的重点是针对blind baby的,由此可见,B为本题答案。
转载请注明原文地址:https://kaotiyun.com/show/UyFK777K
0
专业英语四级
相关试题推荐
WhichofthefollowingisNOTthereasonthatthemanwantstogoonadiet?
Depressingreportsabouthowquicklytheworld’stropicalforestsarebeingfelledarecommonplace.Butdepressingreportsabout
ThereportissuedbytheKaiserFamilyFoundationmainlyshowsthat
Asweallknow,sleepdeprivationcanleadtoexhaustion-fueledmistakesintheworkplace,whethertheybeasimpletypoinaqu
AsimplepieceofropehangsbetweensomeenvironmentallyfriendlyAmericansandtheirneighbors.Ononesidestandthosewhoha
AlthoughAsiancountriesaregenerallymore______insocialcustomsthanWesterncountries,therehavebeenseveralnotableexam
TheKalinagotribe,ontheislandofDominica,isundersomehistoricpopulationpressure.The【C1】______majorityoftheWestI
BilingualeducationiscontroversialintheUnitedStates.【C1】______,agrowingbodyofresearchshowsthat【C2】______speakingtw
Inthe19thcentury,thereusedtobeamodelofhowtobeagoodperson.Thereareallthesetorrentsofpassionflowingthroug
Allovertheworld,yourchancesofsuccessinschoolandlifedependmoreonyourfamilycircumstancesthanonanyotherfactor
随机试题
下列有关调查取证的说法正确的是:
企业会计制度总体设计的内容。
甲状腺大部分切除手术前患者应练习的体位是
(2011年)硝酸盐被细胞吸收后,被用作电子受体还原为氮气的生物过程,称为:
线路遭到破坏,则对事故地点前后各()m线路质量进行测量,对事故关系人员分别调查,检查有关技术文件的编制、填写情况,根据调查情况初步确定事故原因和责任。
我们日常生活中所食用的板栗,其外面呈现褐色而且坚硬的壳是由子房壁发育而成的,所以一颗板栗就是()。
儒家创始人孔子的中心学说是()。
A.knowingB.sourceC.knowledgeD.consultE.helpF.latestG.unnecessaryH.vitalI.qualitiesJ.switchK.acquain
A、Whentheyseethesteamandiceinthetank.B、Whentheyseetheactorsfillingthecontainers.C、Whentheyseetheactorsput
Short-termdebtisamajorsourceoffundsforafirm.Forlargefirms,commercialbanksarethesourceofshort-termfinance,a
最新回复
(
0
)