《人教版英语必修三.docVIP

人教版英语必修三 Unit?4?Astronomy:the?science?of?the?stars 重难点 Teaching aims: 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.Emphasis: 1. Words and expressions: gravity, float, cheer up, now that, break out, etc2. Astronomic knowledge like gravity and black hole.Difficulties: 1. Help the students to understand the development of gravity.2. Help the students to know how gravity influences us.Teaching methods: skimming, scanning, discussing.Teaching aids: a tape recorder, a projector and a computer. 【词汇识记】 1．太阳系solar system? 2．及时，总有一天 in time 3．阻止，制止prevent from? 4．依靠，信赖depend on 5．感到高兴cheer up? 6．既然，由于now that 7．蔓延spread? 8．一般而言generally speaking 9．坚固的solid? 10. 作一次太空旅行make a trip into space? 11．熟悉，掌握get the hang of? 12．突发，爆发break out 13．增多，使繁殖multiply? 14．大气层，气氛atmosphere 15．消失，经过go by? 16．与…不同be different from 17．冷却cool down? 18．失重地weightlessly 19．全球变暖global warming? 20．地心引力gravity 【单词用法】 1、multiply (数目上)增加，增多；乘；（使）繁殖 【经典例句】1) Our problems have multiplied since last year. 2) 2 and 5 multiply to make 10. 3) 6 multiplied by 5 is 30. = Multiply 6 by 5 to make 30. 4) The plants here multiply rapidly. 2、encourage 鼓舞；促进；怂恿。后接名词、代词，也可接不定式作宾语补足语。如： High prices for corn and wheat will encourage farming. 玉米和小麦的高价将促进农业的发展。 【经典例句】My success encouraged me to continue. 我的成功鼓励我继续干下去。 He encouraged me to learn dancing. 他鼓励我去学跳舞。 3、development (1)[U]成长,发育；发展(过程)；扩展 【经典例句】The development of this industry will take several years. 这项工业的发展要经过几年的时间。 (2)[C]开发区, 新社区 a new housing development 新建住宅区 (3) [C]进化,进展；新情况,新闻 What are the latest developments? 【经典例句】The use of computers in teaching is a recent development.教学上使用计算机是新近才有的事. 4、atmosphere [＇ tm sfI ] n.大气层；气氛atmo-(空气,蒸汽) + sphere(球