Unit 4 Astronomy: the science of the starsThe second period Warming up ,Pre-reading, Reading 姓名—— 时间——Learning aims（学习目的）1. Enable students to improve their listening skills and reading ability.2. Enable students to understand the development of gravity and how gravity affects us in different times and places.3.Arouse students’ interest to search for the mystery of space. Step1. Preparing lessons &self-study and exploring the problems课前自主学习：1. 重点词汇和短语Astronomy_________,atmosphere________,system________,violent_______,solid________, Explode__________, carbon_________, dioxide_________, oxygen_______, surface________, Planet_________ harmful__________, development_________, spread_______, method_____, solar system________, in time________, prevent…from_________, depend on____________2. 重点句子（在文章中找到这些句子，并翻译下面这些句子。）1. What it was to become was a mystery until the dust began to slowly combin e into a ball moving around the sun. P25___________________________________________________________________________—————————————————————————————————————2.It’s exploded loudly with fire and rock, which were in time to produce the water vapour, carbon dioxide, oxygen, nitrogen and other gases, which were to make the earth’s atmosphere. P25___________________________________________________________________________ —————————————————————————————————————3. It allowed the earth to dissolve harmful gases, whi ch had become part of the earth’s atmosphere, into the oceans and seas. P25_____________________________________________________________________________——————————————————————————————————————4. Whether life will continue on the earth for millions of y...
