教学目标：
1.能听、说、读、写本课的核心词汇：earth, forest , ocean ,
land, part, rubbish , so many
2.能熟练掌握核心句型
We should stop cutting down so many trees.
3.通过学习，增强环保意识，提出环保建议。
重点难点：
1.能在语境中运用本课的核心词汇和句型。
2.学生能运用核心句型交流看法。
教学用具：
录音机、自制课件等
教学过程：
StepⅠ.Warm up and revision（热身与复习）
1.Sing a song.
2. Do some warming-up exercises.
Step Ⅱ.Presentation and practice（呈现新语言知识和练习）
1. Lead in.
T: Look！ What is it?
Ss: It’s earth.
T: What’s on the Earth? What do you see?
Ss: I see forest. / I see land./ I see oceans.
T: Yes. Today we are going to learn more about the Earth.
2. Ask and answer.
T: What do you know about the Earth?
Ss: We get wood from trees. We get fruit from trees.
T: What do we use wood for?
S1: The Earth is round.
S2: There are animals, people and plants.
3. Learn to say and use the words.
The students say and spell the words.
4. Watch the cartoon and talk about the Earth.
T: What are the green parts?
Ss: They are forests.
T: How about the brown parts?
Ss: It’s land.
T: What’s wrong with the Earth now? Read this dialogue again and try to find the answer.
S1: The Earth was clean, but now some parts are dirty.
T: What should we do to help the Earth?
Ss: We should keep the Earth clean.
5. The pupils read the text carefully. And then try to do some exercises.
Step Ⅳ.Consolidation（拓展延伸）
Act out the dialogues in groups.