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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.
The research involving infant Dennis is directed to _____.
选项 A、helping the blind to see and learn as well as others
B、facilitating the learning process of blind children
C、solving blind children’s psychological problems
D、finding out how children develop intellectually
答案B
解析 首段第3句末的不定式to prevent a lag in the learning process表明了实验目的，另外，文章一开头就提到了本文讨论重点是针对blind children，B为本题答案。A中的the blind指的是所有盲人，而实验研究的只是“盲童”，而且研究的是“学习”的问题，而不是“看”的问题，因此A不正确；选项C中的psychological problems过于空泛；D中的children范围也过宽，原文只关注“盲童”，而不是所有儿童。
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