When reading English texts,you don't need to read every pecie in the same way.Some texts can be skimmed only,for example newspaper articles,before diciding whether you want to read them or not.Novels are read for fun,so you want to read on without looking up all words in a dictionary.But article that contain many facts and a lot of information should be read carefully.You need to go deep into them and pay attention to grammar and all difficult words.