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 50 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.

　　（E） Books published on acidic paper in 1900 should now all be at about the same state of deterioration.

　　正确答案A中的过去50年原文中根本没有提到，怎么能随便引申呢？

　　解析：

　　“50 years ago”自然而然是包括在“past 150 years”这个范围中的。

　　我们可以用x years ago来替代 50years ago，只要X<150，那么这个A选项始终是对的。

　　另外，我认为A的考点是题目里第二个信息：This process of deterioration can be slowed if the books are stored in a cool， dry environment.

　　A选项的意思有两个 1）书是在过去150年内印刷的 2）书不具有历史价值

　　提干告诉我们1）有历史意义的书可以用科技来妥善保存 2）任何在过去150年内印刷的书都可以通过保存于干燥阴凉的环境来延缓腐烂。

　　请注意，延缓腐烂并不代表不会腐烂。A选项的目的就是考察做题者是否把握住这点。如果不注意的话，很容易认为即使书不具有历史价值也能通过保存于阴凉处避免被腐烂。这样的话就上当了。