This is the sixth teaching period of this unit. The teacher can first check the homework and review what they learned in the last lesson.

The emphasis of this period is laid on developing the students’ speaking and writing ability. First show the students the pictures of the Aswan Sam, the Hoover Dam and the Three Gorges Dam. Discuss and talk about the question:What do you think a dam does to a river and the people who live on it? Then go through the part Writing on Page 23 and let the students know what to do.