What  a  large  population!

t: please read 1a carefully and then perform it.
(給學生幾分鐘時間準備，教師在黑板上寫出關鍵詞句。)
（建議使用方案:采取評比方式，評出最佳老師及最佳學生。每次選出一個同學表演地理老師的角色，其他同學作為他/她的學生。幾組表演之后，讓大家推舉出最佳老師及最佳同學。）
t: great. i think you all did well. who do you think is the best teacher and who do you think is the best student?
ss: s1 is … t1 is….
t: ok. everyone thinks… is the best teacher.
… is the best student.
congratulations to them.

step 4  practice   第四步  練習 （時間: 12分鐘）

1.t: look at the pictures of 2 and describe it.
(讓學生通過自己的猜測，用所學過的語言知識把圖片描述一下。教師可以先提問程度稍差的同學，目的是復習較大數字的讀法并把新舊知識結合起來。)
s1: picture 6     the jacket costs ￥326.00.
s2: picture 2     it’s 6 575 miles away from beijing to toronto.
s3: picture 1     the mountain is 8 844.43 meters high.
s4: picture 5     the population of china is 1.3 billion.
s5: picture 4     i think the population of anhui province is 59.9 million.
s6: picture 3     the animal lived 210 million years ago.
t：yeah, very good. you are great. now let’s listen to the tape of 2 and number the pictures you hear.
t: ok, let’s check your answers.
（教師核對答案。）
2.t: let’s play a number game. i will show you some numbers. read them quickly and correctly in groups. the group that can read the most quickly and the most numbers is the winner.
(教師在幻燈片上呈現幾組數字，學生以小組為單位進行搶答，兩位同學做記分員，讀的最多最快、最準確的為勝者。)
1/3     8.75     8.459           281              9.99 billion
5/8     7/9      68.9 million    789.734          1.06 billion
888     1/4      1 05 7           74.91 billion    18.95

(類似這樣的數字至少要準備三組。)
（教師在黑板上畫出計分表。）
g1 g2 g3 g4
   
   
   

(讓學生統計得分，自主地構建形成性評價機制。)
t: ok. g1 gets… g2 gets… g3 gets… g4 gets… so… is the winner. congratulations.
3.t: now i think you can read the numbers quickly. let’s look at the population graph of , then practice dialogs with your partners according to the example.