GRE Reading Comprehension: ETS-GRE阅读ETS - Y46X8YRFP6NF1C9U7

The main purpose of the passage is to A. Persuade historians of the indispensability of a theoretical framework for understanding recent history. B. Present a new model of social movement. C. Account for a shift in a theoretical debate. D. Show the unity underlying the diverse classical models of social movement. E. Discuss the reasoning behind and shortcomings of certain social psychological theories.