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S2: There are not too many trees.
S3: There are too many cars.
S4: There is too much plastic.(教读plastic，通过图片学习意思T: There are two pictures. Which one is about plastic? … Yes, one is about plastic, is about glass.)
4.揭题：
T: Our Earth faces so many problems, right? How to protect and make our Earth pretty? (let’s learn U7 读标题)
Step 2 .While-reading,
1.Scan and find为每幅图找标题：
T: First, open your books and turn to P68. Read the story quickly and try to find the four titles.【The title of P1…Save water. Save energy(学习生词energy，coal，oil). Save trees. Don’t use too much plastic.】
Save water
2.Think and say谈论第一个话题 Save water:
T: First, save water. Let’s have a talk——What do we use water to do ? … So, what do you think of water?(评价: I agree with you)... Is there a lot of water everywhere?
3.教授waste,reuse：
T: Look at his behavior. Is it good? It’s wasteful.(教授waste)
We should not waste water. What should we do?(There’s not much water in many places.) Save﹨ reuse(教授re)
4.Read after tape(Save water)
Save energy
5. Read and answer
T: Part two, save energy. Who can help Miss Zhang to read Q1 and Q2? Thank you. OK class , this time please read the second part quickly and underline the answers.
T: Where does the energy come from? (Sixty-three percent of the energy comes from coal. And seventeen point one percent of the energy comes from oil. So most of the..)
T: Why should we save energy? S: …. T: So we should… We should not…
6.Look and think: What else should we do to save energy?
S: We should turn off the .. when we are not using it.
7.Read the second part
T: OK this time, you should read by yourselves and find out the words that we read falling tone… Can you tell us what words did you find? The words we read falling tone.
8.Question PK
T: It’s time to learn Part3and4. Let’s have a question PK. First, you should read Part3 and 4 carefully. Then, ask and answer questions. Pay attention here: In part3, boys ask, girls answer… 在每个部分提问回答之后带着学生回顾知识点：T: So we know wood comes from… We use…to… Should we cut down too many trees? Why? .. T: So we know we use...to… But it is good or bad? Yes, it’s bad for our Earth. So we should not use… We should use paper..and glass..
9.分别读课文三、四部分
Step 3. After- reading,
1.Let’s retell
T: Choose one part to retell（选择感兴趣的一段，小组内一人一句接龙复述）