1.分子用基数词，分母用序数词，分子大于1时分母用复数形式。

3/4　　 three fourths　　　 3/5　　 three fifths

2. Follow him at a distance.远远地跟着他。

(鼓励学生造句，纠正其中错误，确定多数学生能理解和运用。)

T: Boys and girls, can you make sentences with “at a distance”?

S₁: Let me try. The stars are shining at a distance.

S₂: ...

T: Look at Mars, and its surface is red. It is different from the surface of the earth, and the gravity on it is one third as it is on the earth.

(板书)

(解释一下分数的写法。)

Step 1　 Review　 第一步 复 习(时间：10分钟)

　(检查作业，复习上节课内容，利用九大行星图。)

T: Boys and girls, look at the picture. Let’s say something. about it.

T: Can the moon be visited?

Ss: Yes, it can be.

T: Yes, men have already been there. Can the earth be visited?

Ss: Yes. (全体笑。) We live on the earth.

(鼓励学生互相用不同句式的情态动词被动语态问与答。)

T: Boys and girls, work in pairs. Ask and answer questions in pairs like this. OK?

Ss: Yes.

T: Now I’m going to choose pair 1 to ask and answer.

　 　 (注意学生语言的准确性，特别是情态动词被动语态的运用。)

T: There is going to be an international journey to explore Mars one day. (指着

挂图上的火星说。)

T: Mars is at a distance of about 228 million kilometers.

(板书)

(解释该词组，给出例句。)

For example:

1. Put the stone at a distance of about 20 meters from the door.

地理课堂教学挂图之金星/地球/火星/听力任务幻灯片

3. Learn something more about Mars.

2. Review the passive voice.

1. Master the new word：

storm

4. Homework:

Rewrite the e-mail from Uncle Stephen to Kangkang in your own words, using the underlined words.

(家庭作业：用划线的关键词，重写一封e-mail。)

Section　 C

The main activities are 1a and 3.重点活动是1a和3。

3. T: Let’s listen to the e-mail again and underline the key words I repeat for you:

2. (播放录音，学生听完后回答下列问题。)

T: Who is this e-mail from?

S₃: It’s from Kangkang’s uncle, Stephen.

T: Where did he write this e-mail?

S₄: On Mars.

T: How long has he been there?

S₅: Two days.

T: How long did it take them to get there?

S₆: More than two years.

T: Did everything go well during the journey?

S₇: Yes, the journey has gone very well.

T: What did they do in the spaceship?

S₈: They had to produce most of the food in the spaceship.

T: What did Uncle Stephen think of the journey?

S₉: It’s long but it’s worth.

(问题可根据实际情况选用。接着完成3b的判断练习。)

T: Well done, everyone! Read the e-mail again and mark(T) for True or (F) for False in 3b.