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
39
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
Itcanbetemptingtomakeahastydecisionwhenakilleropportunitycomesalongorthethoughtofspendinganotherdayonthe
[A]lengthy[I]transparent[B]transformation[J]deliberately[C]absorption[K]bestow[D]bursting[L]imperfections[E]
Whennooneansweredthedoor,she_____throughthewindowtoseeifanyonewasthere.
A、AdvisingcriticstorespectthePresident’sreligiousbelief.B、ProtestingagainstthePresident’sreligiousbelief.C、Asking
A、Processingmeat.B、Cookingprocessedmeat.C、Neitherprocessingmeatnorcookingprocessedmeat.D、Thesetwopartscan’tbefu
A、Shefeelsconcernedaboutit.B、Shefeelscloseandattractedtoit.C、Shehopestostaythereforever.D、Shehasbeentiredo
PASSAGETHREEWhatdoestheauthormeanbysaying"itdoesn’tmeanartcan’tbeweaponized"(Para.5)?
PeoplethroughoutthehistoryhavesoughtwaystoalterconsciousnesaA【C1】_____exampleisthesweatlodgeritualoftheSioux
PeoplethroughoutthehistoryhavesoughtwaystoalterconsciousnesaA【C1】_____exampleisthesweatlodgeritualoftheSioux
随机试题
某男,40岁,大便发黑2天,无呕血;有胃溃疡史两年;嗜烟酒。请分析
某弱酸性药物在pH7.0溶液中容易解离,其pK值约为多少
患者,男,78岁。经常气短,呼吸困难。最近出现头痛,烦躁不安,渐至言语不清,昏迷,于今天入院。体格检查:肺部叩诊呈过清音,心浊音界缩小,肝浊音界下降。应首先考虑的诊断为
当两种商品为替补品时,其需求交叉价格弹性为()。
某公司购进的原材料因管理不善而毁损,毁损的材料成本为1000元,购进时的增值税进项税额为130元。下列会计处理中,正确的是()。
根据动机水平与学习效果的关系研究,假如考试难度较小,要想取得好成绩,学生学习动机的最佳水平一般应该偏高。()
领导艺术就是遵循规律、顺应人心、见识高明、审时度势、卓有成效地解决问题的领导策略技巧。其中“顺应人心”是领导艺术的()。
19世纪70年代,沙俄、英等国殖民势力支持阿古柏等侵略我国新疆地区,直隶总督________竟然借口“海防西征,力难兼顾”,主张放弃新疆。陕甘总督_________则力主规复新疆,于1875年4月被任命为钦差大臣督办新疆军务。到1878年,清军收复了除__
对于以下编号为①、②、③的正则式,正确的说法是()。①(a*b)*b②(a|b)*b③(b*|a*)*b
两个或两个以上的模块之间关联的紧密程度称为()。
最新回复
(
0
)