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  3. 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

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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.
Infant Dennis becomes the subject of the experiment most probably because ______.
选项 A、he already lags behind the sighted children
B、he leads a life as normal as any other children
C、he is at the early stage of the learning process
D、he has the aid of a sonar-type electronic device
答案C
解析 首段首句提到的a blind baby，第3句提到的ten-month old和末句提到的infant以及第3句和第4句提到的learning，都表明Dennis成为研究对象是因为做实验的是盲童从小的学习过程，Dennis年龄很小，正处于学习的最初的阶段，符合做实验的条件，因此可推断本题应选C。虽然实验是为了防止盲童在学习上lag behind，但这并不意味着Dennis已经lag behind，因此A不正确；B文中没有提及；D是Dennis成为研究对象后特意为他设计的，并不是使他成为研究对象的原因。
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