All of these books are flawed. First, the way to read a book will not result in an effect. Would rather you are a book, a careful, meticulous, than reading 10 books a speaker does not understand the contents of the book. Second, the content of this book is not consistent with the impact of the impact of our soul. Third, choose the right books for the purpose of using. For example, friends who want to learn English, but do not know the purpose of choosing their own books. In short, there are many advantages, but there are some shortcomings to overcome
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