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Ⅰ. Pre-task preparations
1. Play the video.
2. Free talk.Let Ss find the Earth,then say something about it.
T:What do you know about the Earth?
S1: The Earth is round.
S2:There are animals,people and plants on the Earth.
S3:There is a lot of water on the Earth.
…
（Show the title:The Earth.）
Ⅱ. While-task procedures
1. Show:Listen and say，learn the words ocean,forest,landand the sentence The …parts are….
T:Look at the Earth,there are many different parts on the Earth.Tell me what they are.
1）
T:What are the blue parts?
Play:ocean
S1:They’re oceans.
Ss:The blue parts are oceans.
2）
T:What are the green and brown parts?
Play:forest
S1:They’re forests and land.
Ss:The green parts are forests.
Ss:The brown parts are land.
2.Play the tape in Listen and say,let Ss read.
3.Read Listen and say,then answer the questions.
T:What’s wrong with the Earth now?
S1：The Earth was clean and beau tiful,but now some parts are dirty.
3. Free talk：
T: Yesterday,we talked about some problems one the Earth. What should we do protect the Earth?
T: as you mentioned just now,the Earth was clean but now some parts are dirty.what makes the Earth dirty?Why does the Earth get sick? In today’s class, we are going to find out more. Before reading the passage,do you know why the Earth is getting sick?