effort可用作不可数名词，表示"力气"，例如：

　It took a lot effort to lift the boxes.抬起那些箱子要花很大的力气。

　effort也可用作可数名词，表示"费劲的事"、"尝试"，例如：

　It was an effort to get up this morning.今天早晨起床很费劲。

　Despite all our efforts ,we failed.尽管我们尽了力，我们还是失败了。

　Make an effort to do sth.努力做某事。例如：

　He made an effort to arrive on time.他尽量准时到达。

7.diversity的意思是"变化多样"，"多样性"相当于variety,例如：

　The plants of Asia show great diversity of form.亚洲的植物形态多种多样。

　There must be a wide diversity of opinions.（对此）准是众说纷纭。

联想记忆 variety(质量、种类或特征的)变化：

　　You need a lot of variety in your diet.你的膳食要多样化。

　　种类、品种：different varieties of bananas不同品种的香蕉

　　a variety of 各种：These T-shirts are available in a wide variety of colors.

　　这些T恤有各种各样的颜色供挑选。

Step 4 Post-reading

Purpose: To have a deep understanding of the text.

Answer the following questions according to the text.

(1). In what province is Changbaishan?

(2). What is a nature reserve? Why is Changbaishan a famous nature reserve?

(3). What is the most popular tourist attraction in the reserve?

(4). What does Tianchi mean? How was Tianchi formed?

(5). What is the connection between the Manchu people and Tianchi?

Step 5 Reflective thinking

　Think of a powerful natural force (such as an earthquake, flood, typhoon, storm) that you have experienced . You can use your imagination if you have not experienced any of these things. Tell your partner about your experience and how you felt.

Step 6 Homework

　1. Make some sentences with the new words and expressions.

　2.Try to write a short composition about a natural disaster.

Period 4 Learning about Language

Goals: 1. To enable the Ss to master some new words and expressions.

2. To get the Ss to master the grammar.

Teaching procedures:

Step 1 Free talk

　Talk about a certain natural disaster you have seen or heard about.

　Use the words and phrases you have just learned.

Step 2 Word study

Purpose: To consolidate the words and phrases in the text.

一. Complete the sentences with suitable words.

　　　bore, bored , boring

　　1. The students were so that some of them fell asleep.

　　2. Will it you to draw the tiger over and over again?

　　3.I left the theater before the opera ended; it was deadly

　　　impressive, impress

4. His speech about the doctor who worked heart and soul for Tibetan people