III．教学重难点

1. Develop students' reading ability.

2. Enable students to talk about the origin of the earth.

IV. 教学过程

Lead in by free talk

1. Looking and saying

Have you ever wonderedd how the universe began? Well I'm sure you may have many answers to this question, but I have one that perhaps, you may not have heard of yet. I will be giving you my theory on this subject. Now look at the screen and listen to me telling you something exciting.

2. Talking and sharing

Do you know how the universe began?

In the 1920s in California, astronomer Edwin Hubble observed distant galaxies using an