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Unit 6 Welcome
The Present Simple, the Past Simple, and “Used to”
Reading Comprehension: The History of Astronomy
Vocabulary Quiz: The History of Astronomy
Rule 6.1: Forms
Exercise 6.1: Evolution
Rule 6.2: Uses
Exercise 6.2: Women and Science
Rule 6.3: Statements, Questions, and Answers
Exercise 6.3: Pythagoras
Review 6A: Physics
Review 6B: DNA
Audio: Time for a Test
Vocabulary Crossword
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Unit 6 Welcome