Exercises
Reading Comprehension
Structure of the Text
Unit 3: Exercises
Vocabulary
Cloze
Translation
Unit 3: Reading comprehension
1.        In paragraph 1, the author says that we are in the middle of a sixth great extinction. What are these great extinctions? Could you name some. In what way is the current great extinction different from the previous five ones?
        The difference lies in the fact that the previous five great extinctions have occurred for natural causes, but the current great exti ...