Comprehension Exercises o The theme of the essay (Students' Book: P89) o By applying such methods of persuasion as refuting opposing views and citing results of research and observations, the author argues for replacing the traditional heterogeneous classroom with grouping pupils according to their interest and abilityComprehension Exercises • The theme of the essay （Students’ Book: P89） • By applying such methods of persuasion as refuting opposing views and citing results of research and observations, the author argues for replacing the traditional heterogeneous classroom with grouping pupils according to their interest and ability