目标 1. develop our reading ability and learn to use some reading strategies such as guessing, key words, skimming, scanning and so on. 2. learn about the development of the astronomy in china. 重点 develop students’ reading skills by reading. 二次备课难点 learn different reading skills for different reading purposes. 自主学习 task 1：looking and discussing 1. look at the pictures and name the eight planets in our solar system。 2. the origin of life on earth is a question that interests astronomers. what do you know about it? 3. read the titles and look at the pictures. predict what the reading will be about. task 2：asking and answering 1. predict what is going to be about by looking at the pictures and the title. do ex2 on page 25
