10. Almost all of the books published in the past 150 years were printed on acidic paper. Unfortunately, every kind of acidic paper gradually destroys itself due to its very acidity. This process of deterioration can be slowed if the books are stored in a cool, dry environment. Techniques, which are now being developed, to deacidify books will probably be applied only to books with historical significance.
If all of the statements in the passage above are true, which one of the following must also be true?
(A) If a book was published in the past 150 years and is historically insignificant, it will probably deteriorate completely.
(B) Almost all of the books published in the past 150 years will gradually destroy themselves.
(C) Almost all of the books that gradually deteriorate are made of acidic paper.
(D) If a book is of historical significance and was printed before 150 years ago, it will be deacidified.（A）
(E) Books published on acidic paper in 1900 should now all be at about the same state of deterioration.
前人讨论过，但还是觉得B也可以解释的通的。
A：“and is historically insignificant ”,好像根本是多余的。 是不是只根据If a book was published in the past 150 years 就可以判断出it will probably deteriorate completely？
但是文章只提到“gradually destroys itself due to its very acidity”并没有提到会destroy completely,
B 错在哪里呢？
"and is historically insignificant" in A is a second necessary condition for the conclusion "it will probably deteriorate completely" to stand. If a book is historically significant, it could be protected by the deacidifying technique, and thus won't deteriorate.
B is wrong because the deacidifying technique could protect books from destroy themselves.
Because of the strong meaning of "destroy", the end result of "gradually destorying itself" is "complete destroying".
啊呀，又看错了。 insignificant 看成了significant.太不仔细了！！
谢了楼上二位！
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