Three good Websites

There are many websites in the world. Today, I'm going to introduce three good websites in English. First, I often use Wikipedia to know the meaning of difficult word or person. It is good to get plain information. Second, Amazon has very useful system. When I searched a book that I can't get it in Japan, there were many books that related to my keywords in Amazon website. I could choose whether I will buy used book or new book. Of course, used book is cheaper. I thought it is good for recycle and useful. I also use Yahoo! to get information. Yahoo! is very big websites, so every time I use it, I can get information that I want. Furthermore, Yahoo! has a good translation system, It isn't good way to study English; however, I use it only when I couldn't understand the meaning of article clearly and it article has a lot of slang in it. I want to know good website more .