Is there a library in Beijing? Can Beijing Book Building be read for free? Which book building is better?

There are three large book buildings in Beijing: Xidan Book Building, Wangfujing Book Building and Zhongguancun Book Building. There are many people inside, but few seats. Many people sit directly on the ground and read books. I often go to Xidan Book Building. Take the 1 line to Xidan and you can see it. Wangfujing is in Wangfujing Pedestrian Street, which is not bad. Zhongguancun is in Haidian. Take Line 4 to Zhongguancun and walk for five minutes.