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

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

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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 robotlike【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.
【C19】
选项 A、after
B、when
C、before
D、as
答案C
解析 盲人是在新机器的测试中“有帮助的”，再联系上下文，显然应该是在新产品上市前(before)进行测试与研究的。
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