英语作文（关于书）

今天闲着,又快考级了,所以当是练笔吧.希望对你有用.
Books
There are all kinds of books available in the world.They cover various fields of knowlege ranging from science of society and so on.
Books are our close friends and our teachers as well.We gain knowlege and power from books.We enlarge our field of vision greatly by reading books.Historical lessons and the experience of others covered in the book make us smart.
Yet we can't deny the fact that some books will do harm to our mind.For example,the obscene books and violent books may push us to do something bad.Therefore,we should resist these ill effect from the obscene and violent books and try to select the wonderful books which will do us good.