Although there are many skillful Braille readers, thousands of other blind people find it difficult to learn that system. They a

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问题     Although there are many skillful Braille readers, thousands of other blind people find it difficult to learn that system. They are thereby shut【C1】______from the world of books and newspapers, having to【C2】______on friends to read aloud to them. A young scientist named Raymond Kurzweil has now designed a computer which is a major【C3】______in providing aid to the【C4】______. His machine, Cyclops, has a camera that【C5】______any page, interprets the print into sounds, and then delivers them orally in a robot-like【C6】______through a speaker. By pressing the appropriate buttons【C7】______Cyclops’s keyboard, a blind person can"read"any【C8】______document in the English language. This remarkable invention represents a tremendous【C9】______forward in the education of the handicapped. At present, Cyclops costs $ 50,000.【C10】______, Mr. Kurzweil and his associates are preparing a smaller【C11】______improved version that will sell【C12】______less than half that price. Within a few years, Kurzweil【C13】______the price range will be low enough for every school and library to【C14】______one. Michael Hingson, Director of the National Federation for the Blind, hopes that【C15】______will be able to buy home【C16】______of Cyclops for the price of a good television set. Mr. Hingson’s organization purchased five machines and is now testing them in Maryland, Colorado, Iowa, California, and New York. Blind people have been【C17】______in those tests, making lots of【C18】______suggestions to the engineers who helped to produce Cyclops. "This is the first time that blind people have ever done individual studies【C19】______a product was put on the market," Hingson said. " Most manufacturers believed that having the blind help the blind was like telling disabled people to teach other disabled people. In that【C20】______, the manufacturers have been the blind ones. "
【C18】

选项 A、true
B、valuable
C、authentic
D、pleasant

答案B

解析 词义辨析题。valuable“宝贵的”;authentic“真品的,真实的”;pleasant“令人愉快的”。
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