Unit 4 Welcome to the unit & Reading 课件-2022-2023学年高中英语牛津译林版（2020）选修第一册

U4 Fun with science Wlcm & reading 1. What affects the travel of the starlight? Discussion The travel of the starlight is affected by the air. When a star shines its light through our atmosphere, the air bends the light. As the air moves, its temperature and density change, affecting the way the light bends. 2. Why do the stars closer to the horizon appear to twinkle more than those stars higher in the sky? Because between us and the stars closer to the horizon, there is a lot more air, so they appear to twinkle more than those stars higher in the sky. Discussion 3. Why is a flower’s fragrance essential for the plant’s survival? Each flower’s fragrance is unique and it attracts particular insects to the flower, which help spread its pollen so that seeds can be produced. What other fun scientific facts do you know? Science is a way of life. Science is a perspective. Science is the process that takes us from confusion to understanding in a manner that’s precise, predictive and reliable … —Brian Greene 科学是一种生活方式。科学是一种观点。科学是以一种精确、前瞻、可靠的方式使我们从困惑走向理解的过程…… ——布赖恩·格林 1. According to the title and the picture beside it, what do you think the blog post is mainly about? The blog post might be mainly about the microorganisms and how they affect human health. These invisible microorganisms live in and on our body in many different kinds of forms. 2. Where can you find microorganisms? As microorganisms are so tiny and numerous, I think they can be found everywhere. They live in water, soil and air, and on all objects. They are also found on and inside our body. 3. How do you think microorganisms harm or benefit us? Microorganisms benefit us in various ways. For example, they are used to make certain foods we enjoy like cheese and yoghurt. Others harm us by making us ill like the viruses that cause the common cold and the flu. 1. What is the outline of the blog post?—A1 Introduction Main body Conclusion Para. 1: Microorganisms influence our body and mind in big unexpected