首页
登录
职称英语
A blind baby is doubly handicapped. Not only is it unable to see, but becaus
A blind baby is doubly handicapped. Not only is it unable to see, but becaus
游客
2023-08-11
41
管理
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 device 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 Dennis 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. [br] "its edges"(Line 11, Para. 2)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2段第8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://tihaiku.com/zcyy/2917904.html
相关试题推荐
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
[originaltext]YoucouldsaythatJosephCornellbecameanartistbecauseof
[originaltext]YoucouldsaythatJosephCornellbecameanartistbecauseof
Ablindbabyisdoublyhandicapped.Notonlyisitunabletosee,butbecaus
Ablindbabyisdoublyhandicapped.Notonlyisitunabletosee,butbecaus
Ablindbabyisdoublyhandicapped.Notonlyisitunabletosee,butbecaus
[originaltext]Ilovetreesbecausetheyhavemanydifferentshadesofgreen,so
[originaltext]Ilovetreesbecausetheyhavemanydifferentshadesofgreen,so
[originaltext]Ilovetreesbecausetheyhavemanydifferentshadesofgreen,so
随机试题
SevenStepstoaMoreFulfillingJobA)Manypeopletodayfin
Thewealthofacountryshouldbemeasured______thehealthandhappinessofit
Whyis(请作答此空)funWhatdelightsmayitsp
对隧道工程防水混凝土进行抗渗性能试验,请回答下列问题。(4)防水混凝土抗渗性试验
关于毒性中药和麻醉中药存放的说法,错误的是A:不能放在一般药斗内B:专柜存放
药物随胆汁进入小肠后被小肠重新吸收的现象A.肠肝循环B.生物利用度C.生物半衰期
社区工作者小李通过寻找有关服务,为社区弱智儿童寻找特殊学校,协助其接受文化教育。
以证券市场过去和现在的市场行为为分析对象,应用数学和逻辑的方法,探索出一世典型变
中国某法院审理一起涉外民事纠纷,需要向作为被告的外国某公司进行送达。根据《关于向
根据票据法律制度的规定,下列情形中,导致汇票无效的有()。A.背书人陈某背书时在
最新回复
(
0
)