It's hard to predict. There are a lot of different structures they can use, and I think it's generally best to read with an open mind. If you go in with preconceptions about what it's "supposed to be" you're going to frequently be misdirected.
I like the economist. I don't read it much but when I do, I feel like most of the articles' structure is very similar to RC passages' structures. Some of the topics are quite interest as well!
Upon reviewing my technique, I guess I got carried away by the information, especially in difficult passages, and placed less emphasis on the reasoning structures. Advice on how to avoid this will be helpful too :)