You know you have to read "between the lines，" to get the information. （1） 　 　You shouldn't mark a book which isn't yours.People who lend you books expect you to keep them clean.If you think it is useful to mark books，you will have to buy them.

There are two ways in which one can own a book.One is to pay for it，just as you pay for clothes and furniture （家具）.But full ownership comes only when you have made it a part of yourself. （2） 　 　

There are three kinds of book owners.（3） 　 　The second has most of the books that are as clean as those on the day they were bought.The third has a few dog﹣eared （翻折的）books，which are marked from front to back.

Why is marking a book necessary？ （4） 　 　And reading is thinking.The marked book is usually the thought﹣through book.Writing helps you remember the thoughts you had a lot，or the thoughts the writer expressed.

（5） 　 　 The book you read for pleasure can be read in a state （状态）of relation，and nothing is lost.But for a great book，rich in ideas，you can't let your eyes move across the lines.You should come up with an understanding of what you have read.

A.The best way to be a full owner is by writing it. B.Here are some suggestions on getting the information during your reading. C.Because it keeps you awake. D.If reading is to learn anything more than passing time，it must be active. E.The first has all the books that are unread and untouched.