仁愛(ài)版初三英語(yǔ)上冊(cè)全冊(cè)教案2
(板書(shū)并要求學(xué)生掌握rise；理解escape。)
escape
rise
t: this is called “the greenhouse effect”.
(板書(shū)并要求學(xué)生理解。)
the greenhouse effect
t: what happens to the icebergs(冰川)?
ss: some parts of them change into water.
t: so it causes the level of the oceans to rise.
(板書(shū)并要求學(xué)生掌握。)
level
t: (展示1a第4幅圖。)please look at this picture. around the earth, there’s a special kind of oxygen called “ozone”.
(板書(shū)并要求學(xué)生理解。)
ozone: o3
t: but now air pollution is destroying it and that has made a very big hole in the ozone layer.
(板書(shū)并要求學(xué)生理解。)
ozone layer
t: too much harmful radiation from the sun passes through the hole and reaches the earth.
(板書(shū)并要求學(xué)生理解。)
radiation
3. (讓學(xué)生快速閱讀1a，用所給的詞組填空。完成1a。)
t: we humans have lived on earth for only 35 000 years, but during this period we have changed our planet a lot in many ways. now read the passage and then choose a proper title for each paragraph from the phrases above the passage.
(板書(shū)并要求學(xué)生掌握。)
on earth, period
(學(xué)生完成后與教師核對(duì)答案。)
4. (教師出示小黑板上的問(wèn)題，讓學(xué)生再讀一遍課文后回答。)
(1) have we changed our planet in many ways?
(2) have people done good to the earth?
(3) why are more and more sorts of animals and plants disappearing?
(4) are many rivers and lakes dead now?
(5) is ozone important to the earth? why?
(6) has carbon dioxide in the air increased a lot?
(讓個(gè)別學(xué)生回答，完成小黑板上的問(wèn)題。)
step 3 consolidation 第三步 鞏固(時(shí)間:8分鐘)
讓學(xué)生再次讀1a，完成1b，鞏固本課的語(yǔ)言點(diǎn)，培養(yǎng)學(xué)生的閱讀能力。
1. (讓學(xué)生再次讀課文，完成1b。)
t: read the passage again. finish 1b alone.
(板書(shū)并讓學(xué)生猜測(cè)mars和refer to的漢語(yǔ)意思。掌握refer to；了解mars。)
mars
refer to
(學(xué)生完成后，師生核對(duì)答案。)
2. (讓學(xué)生齊讀課文，保證每一個(gè)學(xué)生參與其中。)
t: now please read the passage together.
3. (教師讓學(xué)生討論并找出新的或不懂的語(yǔ)言點(diǎn)，培養(yǎng)學(xué)生的自主學(xué)習(xí)能力。教師解釋學(xué)生仍有疑惑的知識(shí)點(diǎn)并板書(shū)。)
4. (讓學(xué)生兩人一組討論，完成下面的表格。)
t: how many kinds of pollution are mentioned in the passage? how do they affect our environment? according to 1a, finish the form on the blackboard.
(板書(shū))
kind of pollution effect
step 4 practice 第四步 練習(xí)(時(shí)間:10分鐘)
使學(xué)生了解各種污染對(duì)地球環(huán)境的影響，培養(yǎng)他們的環(huán)保意識(shí)。
1. (讓學(xué)生分組討論，看哪組最快說(shuō)出o3，co2和溫室效應(yīng)的含義及其對(duì)環(huán)境的影響，并以此寫(xiě)一篇短文，完成2。)
t: please read the passage again, discuss the meanings of the following expressions in 2 in groups of 4, and then write down how they affect the environment.