单选题 .  Although there are many skillful Braille readers, thousands of other blind people find it difficult to learn that system. They are thereby shut     41    from the world of books and newspapers, having to     42    on friends to read aloud to them. A young scientist named Raymond Kurzweil has now designed a computer which is a major     43    in providing aid to the     44    . His machine, Cyclops, has a camera that     45    any page, interprets the print into sounds, and then delivers them orally in a robot-like     46    through a speaker. By pressing the appropriate buttons     47    Cyclops's keyboard, a blind person can "read" any     48    document in the English language. This remarkable invention represents a tremendous     49    forward in the education of the handicapped. At present, Cyclops costs $50,000.     50    , Mr. Kurzweil and his associates are preparing a smaller     51    improved version that will sell     52    less than half that price. Within a few years, Kurzweil     53    the price range will be low enough for every school and library to     54    one. Michael Hingson, Director of the National Federation for the Blind, hopes that     55    will be able to buy home     56    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     57    in those tests, making lots of     58    suggestions to the engineers who helped to produce Cyclops. "This is the first time that blind people have ever done individual studies     59    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     60    , the manufacturers have been the blind ones."41.