【正文】
mammals。reptiles。amphibians。shell fish and all sorts of fish。water。in time。 Unit 4 Astronomy:the science of the stars Period 1 文本研讀課 學(xué)習(xí)目標(biāo) the theory about the origin of the universe and life on the earth— the “Big Bang” theory. to concern about the future of life on the earth. 思考導(dǎo)引 How the universe began. 課堂探究 What is the main idea of the text? Which paragraphs are the questions mentioned in? (1)How old is the earth? (2)How does the universe begin? (3)Is there any water in the Mars? (4)When did dinosaurs disappear? (5)Which animal is the most important one