Introduce 3 good web sites (in English; make links to the sites)

I’m going to introduce three good English web sites. First is Wikipedia. Wikipedia is a free online encyclopedia, and you can find a lot of information in different languages. However, the negative point of Wikipedia is anybody can write about the topic, so the information might be wrong. Secondaly, Sparknotes is a good web site, especially for the students. This is a free online study guides, and you can find summary and analysis of many books. If you need to understand deeply about the story that you are studying or having difficulty, you can go this site. When I was a high school student, I used this site a lot and it was very useful. Lastly, CNN is an online news site, and it is helpful when you want to know what is happening in the world or U.S. now, and when you want to find news articles.