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：
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