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本课中四会及三会单词的正确读音
能运用所学词句复述或表演课文章节
四、 教学过程：
Step 1 Greetings
Step 2 Pre-reading
1.Show some pictures of different cities. T:Do you like this city? Why ?
T:Yes ,I like it,too.The river and the air are clean. T:Do you like this city? Why?
S:Because it’s not clean/dirty.
T:It’s messy and dirty.新授 messy 、dirty.板书【设计意图】 通过图片和文字，让学生感受并试着说出干净和脏乱城市的区别。
2.Ask for “city guards”.
T:Now, Do you want to be a city guard.(争做环保小卫士) ? To be a city guard, you have two tasks:
(1).What makes our city dirty?
(2).What can we do to keep our city clean?
T:We don’t like the dirty city， so we should keep our city clean. (揭示课题) Keep our city clean
【设计意图】以争做环保小卫士为契机，征召志愿者，并对志愿者提出要求，激发学生探究问题的积极性。并引出课题。
Step 3 While-reading
1.Watch and choose
How is the city?
（2）What makes our city dirty?
A.clouds and waterB.smoke and rubbish
【设计意图】让学生观看动画，初步感知课文，锻炼学生通过自读获取文章大意的能力。
2.Read and find. (快速阅读 P58，完成下面的填空)
What makes … dirty?
_____from cars and
______ from
the air
_______
make(s)
dirty
the streets