2. 外语
  3. The library of congress in Washington, D.C., which【C1】______ the largest collection of books in the world, is fighting a battle

The library of congress in Washington, D.C., which【C1】______ the largest collection of books in the world, is fighting a battle

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问题      The library of congress in Washington, D.C., which【C1】______ the largest collection of books in the world, is fighting a battle against paper deterioration. The【C2】______ of the old books, often yellowed and torn,【C3】______ crumble when they are touched. The main culprit in the battle is the acidic paper that has【C4】______ making books since the nineteenth century.
     Air pollution and moisture【C5】______ the problem.【C6】______ , the books that are most【C7】______ destruction are not the oldest books. The paper in books produced【C8】______  the last century was made【C9】______ cotton and linen rags,【C10】______ are naturally low in acid. And the Gutenberg bible,【C11】______ five centuries ago, was made of thin calfskin, and is in【C12】______  good shape. But in the nineteenth century, with widespread literacy bringing a demand for a cheaper and more plentiful【C13】______ of paper, the industry began using  【C14】______  treated wood pulp for making paper.【C15】______ the chemical in these paper that is causing today’s problem. This problem of paper deterioration is one of【C16】______ concern. France, Canada, and Austria are all doing research into the new methods of deacidification. A new technology has been【C17】______ recently, in fact, that allows for mass deacidification of【C18】______ books at the same time. It costs less than microfilming and  【C19】______ preserves books in their original form.【C20】______ there will soon be treatment facilities all over the world to preserve and deacidify library book collections.
【C20】
选项 A、It is wondered
B、It is realized
C、It is hoped
D、It is wished
答案B
解析 It is hoped：人们希望，此句的意思是：人们希望全世界都将会有用于馆藏书的保存和脱酸的处理设施。 Wish常用于不大可能实现的愿望，it is realized：被意识到。因此正确答案是B。
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