What a large population!
in this lesson we will learn something about the population of china. we know china has the largest population in the world(多媒體展示中國部分城市人口過多現象以及人口普查圖表。). in , china’s population was 1.3 billion.
(板書)
1.3 billion: one point three billion
(教師再板書兩組小數,教會學生怎樣去讀。)
5.68: five point six eight
14.05: fourteen point o five
(小數點后的“零”可讀作“o”,也可讀作“zero”。)
t: let’s read the numbers below. try to read them quickly and correctly.
(教師迅速在黑板上寫出幾組數字,用后擦去。)
0.08 billion 9.17 miles ¥258.00 452.73meters 10.78 million
(學生會積極去讀出這些數字,可讓小組進行,然后個別提問。)
s3: zero (naught) point zero (naught) eight billion
s4: nine point one seven miles
s5: two hundred and fifty-eight yuan
s6: four hundred and fifty-two point seven three meters
s7: ten point seven eight million
t: ok. you did very well. do you know what the population was in 1985?
(有的同學可能知道,有的同學可能不知道,但大家可能會紛紛做出猜測。)
s8: one point one billion.
s9: one point two...billion.
t: stop here. your answers are nearly right. the population of china in 1985 was 1.06 billion.
(教師用小黑板或幻燈片呈現下面的表格。)
(板書)
one-fifth: 1/5
1/2: a (one) half
1/4: a (one) fourth
[或a (one) quarter]
3/4: three-fourths
(或three quarters)
7/8: seven eighths
(用小黑板或幻燈片展示上面圖片,讓學生充分感知分數表達法,教師領讀。)
(接下來可采取競賽形式檢查學生的掌握情況。)
(方案一):小組競賽(使用幻燈片/多媒體/小黑板展示幾組數字,在規定時間內看哪組學生讀的數量多,正確率高。得分較高的為勝。)
1/2 3/4 2/5 6/7 1/6 5/9 11/12
1/4 5/6 2/15 1/20 11/76 9/11 3/ 8
(本組分數只供參考,為了公平,教師可多準備幾組數字呈現給大家。)
(方案二):個人競賽(要求學生回答問題要簡潔,明快。找兩個同學當裁判,學生們以開火車形式進行比較,在規定時間內看哪個同學讀的既快又準。讀的最多、最準確者為勝。)
(教師加以總結。)
t: well done. g1 is the best … (或)s19 is the best….
step 2 presentation 第二步 呈現 (時間:4分鐘)
(讓學生聽聽力,填表。)
t: we have known a lot about the population and the lifespan. now please listen to the tape in 1a and complete the chart below.
year the population of china
1985
(用幻燈片/多媒體/小黑板將表格展示給學生。)
(如果學生一次不能完成,可聽第二遍。)
step 3 consolidation 第三步 鞏固 (時間:10分鐘)