人教版必修5 Unit 1 Using Language
1. Why could he not tell about his theory? (Para 1)Because the powerful Christian Church would have punished him for even suggesting such an idea 2. What was his theory about? (Para 1) All his mathematical calculations led to the same conclusion: that the earth was not the centre of the solar system. Only if you put the sun there did the movements of the other planets in the sky make sense.