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
2024-03-31
16
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/3534164.html
相关试题推荐
Ablindbabyisdoublyhandicapped.Notonlyisitunabletosee,butbecaus
Ablindbabyisdoublyhandicapped.Notonlyisitunabletosee,butbecaus
[originaltext]Ilovetreesbecausetheyhavemanydifferentshadesofgreen,so
[originaltext]Ilovetreesbecausetheyhavemanydifferentshadesofgreen,so
[originaltext]Ilovetreesbecausetheyhavemanydifferentshadesofgreen,so
Depression[A]Inbed,youtossandturn,unableto
Depression[A]Inbed,youtossandturn,unableto
Depression[A]Inbed,youtossandturn,unableto
Depression[A]Inbed,youtossandturn,unableto
Depression[A]Inbed,youtossandturn,unableto
随机试题
WhenRuthRedding,anaccountmanager,wassentonamanagementtrainingcou
We’vejustinstalledtwoair-conditionersinourapartment,______shouldmakeg
硫脲类抗甲状腺药最严重的不良反应是A.血小板减少性紫癜 B.粒细胞缺乏症 C
神经系统活动的基本过程是()A.产生动作电位 B.反射 C.兴奋 D.
以下有关排水系统专用通气管作用的叙述中,哪一项是错误的?()A.污水管道中的
下列选项中,属于国家出资企业的有( )。A.国家全额出资的甲公司 B.国家全额
对于沪港通及深港通的重要意义,以下说法错误的是()。A.刺激人民币资产需求,加
检验批质量验收时,对于一般的质量缺陷可通过返修或更换予以解决,施工单位采取相应措
某铁路工程A标段长度为30km,包括路基土石方50000m3,大桥1座,小桥涵1
对危重急性中毒患者,应立即采取的措施是( )。A.维持生命体征并终止毒物接触
最新回复
(
0
)