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

admin2013-01-10  73
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 tt3at 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.
【C10】
选项 A、which
B、that
C、those
D、they
答案A
解析 which引导非限制性定语从句修饰cotton and linen rags，因此正确答案是A。
转载请注明原文地址:https://www.kaotiyun.com/show/ZRhK777K
0

专业英语四级

相关试题推荐
随机试题
最新回复(0)