(1) The second-hand books sold in the bookstores around now are so cheap that they are definitely more cost-effective than renting books. If you want to do it, rent some books that have low preservation value and are not available in the library, such as some cartoons.

(2) Your book needs to be constantly updated to attract customers, and the cost is very high ~ ~

(3) Besides, how long do those old books need to be rented and how many times can they be returned? The battle line is long.

However, if you just want to cope with the teacher and hand in your homework, you can have a big idea first, and then use the network resources to make a questionnaire, as long as the credibility is high ~ ~ ~