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
2023-08-13
10
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/2922896.html
相关试题推荐
[originaltext]Sunday,2ndNovember,willremaininmymemorybecauseIdid
[originaltext]Sunday,2ndNovember,willremaininmymemorybecauseIdid
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
[originaltext]M:Howdidyoufindthisjob?W:Well,IknewtheshopbecauseI
Depression[A]Inbed,youtossandturn,unabletogetagoodnight’sslee
Depression[A]Inbed,youtossandturn,unabletogetagoodnight’sslee
Depression[A]Inbed,youtossandturn,unabletogetagoodnight’sslee
Depression[A]Inbed,youtossandturn,unabletogetagoodnight’sslee
Depression[A]Inbed,youtossandturn,unabletogetagoodnight’sslee
Depression[A]Inbed,youtossandturn,unabletogetagoodnight’sslee
随机试题
编制专项工程方案的工程有()。A.基坑支护与降水工程 B.土方开挖工程 C
测试用例是测试使用的文档化的细则,其规定如何对软件某项功能或功能组合进行测试。测
甲状腺弥漫性肿大,质地柔软,震颤有血管杂音,应考虑A.单纯性甲状腺肿 B.结节
甲女因抢劫杀人被逮捕,羁押期间不慎摔伤流产。一月后,甲被提起公诉。对甲的处理,应
下列哪种音乐体裁起源于16世纪的牧歌?( )A.清唱剧 B.康塔塔 C.艺
沉香来源于A.菊科植物白木香含有树脂的心材 B.瑞香科植物白木香的根 C.豆
与脑髓充盈关系最密切的脏是A.心 B.肺 C.脾 D.肾
下列关于市场需求预测分析的说法,正确的有()。A.市场分析有助于银行了解拟建项目
A.乳化剂 B.增溶剂 C.防腐剂 D.辅助乳化剂 E.抗氧剂单硬脂酸甘
下列自动喷水灭火系统中,适用于环境温度低于4℃且采用闭式喷头的是()。A.
最新回复
(
0
)