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
19
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
Joe’sparentsvisitedhimatcollegelastweek.Beforetheirplanelanded,i
Alawyerfriendofminehasdevotedherselftotheserviceofhumanity.Her
常用的剖视图有()等。A.全剖视图 B.半剖视图 C.阶梯剖视图 D.局
关于合流排水系统,下述哪些说法是正确的?( )A.当合流排水系统截流井的溢流水
黑龙江是中国位置最北、最东,纬度最高,经度最东的省份。( )
下列关于预期效用理论说法错误的是( )。A.预期效用理论建立在被普遍接受的关于
热原具有特别强致热活性成分的是A:核糖核酸 B:胆固醇 C:脂多糖 D:蛋
A.μ<0.5 B.0.5<μ<0.7 C.0.7<μ<2 D.μ>2
适合做外汇期货卖出套期保值的情形有( )。A.持有外汇资产者,担心未来货币升值
下列激素中,属于下丘脑调节肽的是A.促甲状腺激素 B.促肾上腺皮质激素 C.
最新回复
(
0
)