Unit 4 Amazing Science Welcome to the unit Topic 3 I dont think aliens can be found in space. Section A New words scientific 科学的科学的 research 研究，调查研究，调查 Teaching aims and demands 1. Learn the new word and useful expressions: research What fun! I wont believe there are aliens until I see them with my own eyes. 2. Help the students to learn the use of passive voice. 3. Talk about flying to Mars, the outer space and something about the aliens. 4. Help students to learn expressing possibility and im
