Need of understanding the passages types
This provides a clear understanding of what you are looking in a passage. Help you understand the organisation of the passage. Can get a clear idea of where to look for a particular information in the passage.
GRE Reading comprehension passages contain a logical flow of the information, a clear purpose and evidence and a conclusion statement. Some important elements that an RC passage are background information, claim, a problem statement, views, cause, an effect, a mechanism, and author's view.
Types of RC passages:
1. Exposition which is a comprehensive description of an idea or a theory.
2. Argumentative - presenting two sides of the argument or a contention with or without a resolution.