Unit4 Astronomy:the science of the stars-Vocabulary and Useful Expressions

学习目标：1. try to remember the key words and expressions.          2. try to master the usage of some key words and expressions.学习重点：1. the usages of key words: ①atmosphere ②harmful ③mass ④climate ⑤lay          2.the usages of some expressions: ①in time/on time/in no time ②prevent… from ③ now that ④ break out/in/up/down/away from学习过程：ⅰ.reading 1.         read the words and expressions to check the pronunciation with your partners.2.         read after the teacher.ⅱ.knowledge link1.know the new word according to the word learnt before.⑴ religious adj 宗教上的 ： ______________ (n.)_______________ (意义)⑵ practice  n. 实践；练习： ___