为隆重中国共产党成立97周年，充分发挥基层党组织战斗堡垒和共产党员的先锋模范作用，在二轻系统营造奋勇争先、创造新业绩的浓厚氛围Unit 4 Astronomy the science of the starsLanguage Points（授课日期： 年 月 日 星期 班级 ）授课题目Book3 Unit4 Language Points拟 课时第 课时明确目标1、知识与技能： Help students to learn some important expressions and sentence structure.2、过程与方法: Discussion and group work3、情感态度与价值观：Help students to have a deeper understanding of the play重点难点重点：To help students master some important points of the text.难点： Improve students comprehensive ability.课型讲授 习题 复习 讨论 其它教 学 内 容 设 计因材施教Step 1: DictationDictate some important words and expressions in Unit4Step 2: Sentence patternsNotes to some difficult sentences1. After the “Big Bang ” the earth was just a cloud of energetic dust.随着“轰隆”一声巨响，地球就成为一个云团，充满着具有能量的尘埃。Big Bang(big-bang cosmology) 大爆炸宇宙学。2. It 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 earths atmosphere. 它（地球）巨大的爆炸喷出了烈火与岩石，最终产生了水蒸汽、二氧化碳、氧、氮和其他多种气体，从而形成了地球的大气层。3. Nobody knew that it was going to be different from other planets going round the sun. 谁也不知道地球会别于环绕太阳运转的其它行星。Step 3. Language point1. It allowed the earth to dissolve harmful gases, which had become part of the earths atmosphere, into the oceans and seas. 它使地球把曾经存在于大气层中的有害气体溶解在海洋里。allow to do 允许某人做某事。如：Her parents wont allow her to stay out later than 11:00 in the evening. 她父母不允许她晚上在外逗留超过11点。Please allow me to explain that I did not have any idea about his arrangement. 请允许我解释，我事先不知道他的安排。2 This encouraged the development of early shellfish and all sorts of fish. 这为早期贝类及其他各种鱼类的发育进一步创造了条件。encourage 鼓励；促进；怂恿Father encouraged him to study physics but he prefers maths.父亲鼓励他学物理，但他更喜欢数学。He encouraged me to learn dancing. 他鼓励我去学跳舞。3. They produced young generally by laying eggs. 它们一般是通过孵蛋而繁衍后代的。by doing 用于说明做某事的手段，方式。如：I dont think she can help him by just giving him money. 我认为她光靠给钱是帮不了他的。He used to make his living by painting. 他以前是靠画画为生。4. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.他们把过多的二氧化碳释放到大气层中，这使得地球上的热不能释放到太空中去。prevent from doing 阻止某人做某事。如：His heart trouble did not prevent him (from) going to class the next day. 他的心脏病痛没能阻止他第二天去上课。Nothing can prevent their plans (from) being carried out. 什么也不能阻止他们的计划得以实施。5. Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. 在未来的数百万年中，生命能否在地球上延续取决于这个问题能否得到解决。(sth) depend on (sth else): something might only happen or be true if the circumstances are right for it 取决于；决定于。如：“Will you go fishing this afternoon?” “Well, it all depends on the weather.” “你今天下午去钓鱼吗？” “得看天气。”for millions of years to come 中不定式to come作定语，与前面的名词之间有逻辑上的主谓关系，例如：Step 4 PracticeMake sentences correctly according to the important words and sentencesStep 4: HomeworkMake sentences教学后记：全面贯彻落实党的十九大精神，经研究，决定在系统内开展以“不忘初心、牢记使命”为主题的“红七月服务月”活动。现就有关事项通知如下