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dirty.
the streets
the river
1.两人一组进行讨论，针对两个问题对文中的重点句子做出标记。
2.讨论过程中遇到的困难，小组成员之间要互帮互助，共同解决。
Smoke from cars makes the air dirty.
Black smoke from factories makes the air dirty，too.
What makes the air dirty?
使……变得
factory 工厂—— factories（复数）
Rubbish makes the streets messy and dirty.
metro
What makes the streets dirty?
The river is dirty.
There's rubbish in the water.
What makes the fish dead?
The fish are dead.
What makes our city dirty?
dirty
smoke
rubbish
...
waste paper and cullet（碎玻璃）
危 害
仅此而已？
远远超乎
我们的想象
What can we do to keep our city clean?
Tips :
Underline the key words划出关键词