4. Is Mars a comfortable place for heavy people?

T: Boys and girls, have you finished your discussion? S₁ and S₂ , please?

S₃: Does Mars have a good climate for plants?

S₄: Of course not. That’s impossible.

S₃: Why?

S₄: Because the temperature on Mars is between -138℃and 28℃.

S₃: Oh, I see. Is Mars a useful place to dry fruit?

S₄: No, I don’t think so.

S₃: Is Mars a good place for human beings to live?

S₄: No, because it is too cold for people to live on.

S₃: The last question. Is Mars a comfortable place for heavy people?

S₄: I don’t think so. Although the heavy people will be lighter on Mars, it’s also not a comfortable place for them to live on. Do you agree with me?

S₃: Yes, I think so.

(再让一组同学讨论，教师对这两组同学的表现作个比较，并鼓励赞扬。)

T: OK. Both of the two pairs are excellent.

3. Is Mars a good place for human beings to live?

2. Is Mars a useful place to dry fruit?

1. Does Mars have a good climate for plants?

1. (两人一组讨论2中的问题，并安排两或三组同学汇报。培养学生自主学习和创新能力。)

T: We learned a lot from 1a about Mars just now. Please discuss the following crazy questions with your partner. Then ask and answer in pairs. After that I’ll ask two or three groups to give us a report.

2. (出示幻灯片，完成对火星的介绍，巩固1a内容。)

　　 Mars, the 　　　planet of the solar system, goes around at a 　　　of about 228 million kilometers. Its 　　　is 53% as long as that of the earth. It looks like a 　　　and 　　　ball. It’s very beautiful. But during 　　　and 　　, strong 　　　can cover the whole 　　　of Mars. The gravity on the surface of it is about 　　　as 　　　as it is on the earth. It is very cold and dry there.

(指导学生完成后，板书，讲解并要求掌握dry。)

Step 4　 Practice 第四步 　练习(时间:10分钟)

1. (让学生找出文中关键词并复述1a，加深理解，提高表达能力。)

T: Please retell the passage according to the key words on the blackboard. I will say a key word. You make sentences together, OK?

Ss: OK.

(板书关键词)

T: reported

Ss: It was reported that China plans to take part in an international flight to explore Mars.

T: Good. fourth.

Ss: Mars is the fourth planet from the sun in our solar system.

T: named.

Ss: It is named after Mars, the Roman god of war.

T:　　　 …

1. (让学生在初步了解文章大意的基础上，听1a录音，设置听力任务，提高学生听的能力。)

T:　　　 Just now, we read the text quickly. Have you known its idea very well?

Ss:　　　 No.

T:　 OK, let’s listen to the tape, but please keep your books closed. You should try your best to catch what you are listening to and answer the questions on the screen using the sentences in 1a.

(幻灯片出示听力任务。)

(1) What’s reported?

(2) What does Mars look like?

(3) What’s the weather like on Mars?

(4) Compare the gravity on Mars with that on the earth.

(5) What’s the temperature on Mars?

(6) How far is Mars from the sun?

(让学生听后两人一组核对答案。)

2. (出示火星及罗马战神的图片，简单介绍火星，呈现部分生词。)

T: (指着火星图片。) This is a picture of Mars. It is the fourth planet from the sun in the solar system. It is named after Mars, the Roman god of war. It is much smaller than the earth. Its diameter is half of the earth’s.

(板书并解释。)

T:　　　 Do you want to know something more about Mars?

Ss:　　　 Yes.

T:　 OK, please read 1a quickly. Guess the meanings of the other new words and grasp the main idea of the text.

(三分钟后，板书并解释生词，要求掌握search, storm。)

Step 2　 Presentation 第二步 　呈现(时间:8分钟)