When you read a book, you've probably noticed that a brand new book has a rather special smell, 1 differs from that of an older book. Where does 2 come from? There are three sources — the paper, the ink and the glue.
The Chinese first produced paper, one of the greatest 3 (invent) in the world. It is made 4 wood. The wood must be processed with various chemicals 5 (add) to change its structure, to remove acid and to whiten the paper. Then comes the ink — there are many kinds. Some fade with time, while others get 6 (dark) than years ago. Finally, different glues are used to join the sheets together and attach the covers, whether hardcovers 7 paperbacks. Therefore, you can smell different chemicals 8 (come) out of your new book.
Today, the forms of books 9 (change) dramatically since the birth of ebooks. They might be 10 (convenience), but you can't give your copy to others as a present, and they don't smell as nice.
参考答案
【语篇解读】本文是一篇说明文。当你读一本书时，你会注意到新书会发出一种相当特别的气味，这种气味来源于纸张、墨水和粘书所使用的胶水。
1．which 考查定语从句。分析句子结构可知，空处引导非限制性定语从句，在从句中作主语，指代“a rather special smell”，故填which。
2．it/that 考查代词。根据语境可知，此处指代“a rather special smell”，故用代词it或that。
3．inventions 考查名词的单复数。根据该句中的“one of”可知，此处应用名词的复数形式，故填inventions。
4．from 考查介词。此处表示纸是用木材制成的，应用介词from。be made from意为“由……制成”，尤其是指在原料已完全改变，无法辨认时；be made of意为“用……制成”，此时原料并未改变，仍可辨认。
5．added 考查非谓语动词。分析句子结构可知，动词add和其逻辑主语chemicals构成动宾关系，应用其过去分词形式。
6．darker 考查形容词的比较级。根据空后的比较级标志词“than”和语境可知，此处应用比较级。
7．or 考查固定用法。此处表示不管是精装书还是平装书。whether ...or ...表示“不管……还是……”，故填or。
8．coming 考查非谓语动词。分析句子结构可知，动词come和其逻辑主语chemicals构成主谓关系，故用其现在分词形式。
9．have changed/have been changing 考查动词的时态。根据该句中的“since the birth of ebooks”可知，此处可用现在完成时，表示过去发生的动作到现在已经结束；此处也可用现在完成进行时，表示一个动作从过去某时开始，延续到说话时刻，可能还要继续下去。
10．convenient 考查形容词。“be＋形容词”构成系表结构，故填convenient。