首页
登录
职称英语
The library of congress in Washington, D.C. which 【C1】______ the largest co
The library of congress in Washington, D.C. which 【C1】______ the largest co
游客
2024-10-15
17
管理
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. [br] 【C5】
选项
A、have added to
B、has added
C、added to
D、adding to
答案
C
解析
add to:增添,文章主要用现在时,而空气污染和潮湿问题加重,强调了对现在的影响。因此选用现在完成时。因此正确答案是C。
转载请注明原文地址:https://tihaiku.com/zcyy/3801889.html
相关试题推荐
ThelibraryofcongressinWashington,D.C.which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.which【C1】______thelargestco
ThelibraryofcongressinWashington,D.C.which【C1】______thelargestco
随机试题
Allsocialanimalscommunicatewitheachother,frombeesandantstowhales
[originaltext]M:Excuseme.MayIhavesomeinformationaboutthereceptionpar
Theendlessdebateabout"work-lifebalance"oftencontainsahopefulfootn
A.F(cosx)+C B.F(sinx)+C C.-F(cosx)+C
小轿车的座次高低一般是依据()决定的。A.陪同人员 B.来访人员 C.驾驶
职业病的三级预防中,一级预防是指A.早期发现职业危害因素对人体的影响 B.防止
一个1岁小儿临床诊断为甲状腺功能低下症,摄X线片测定骨龄时,应摄A.右腕、膝X线
汇付可分为( )。A.电汇 B.托汇 C.信汇 D.证汇 E.票汇
A.细胞因子的多效性 B.细胞因子的重叠性 C.细胞因子的拮抗性 D.细胞
根据《标准施工合同》,关于承包人施工安全责任的说法,正确的是( )。A.承包人
最新回复
(
0
)