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Environmental problem（环境问题）
B. Educational problem（教育问题）
C. Medical problem（医疗问题）
Listen and choose
Class project
Problems
Keep our city clean
（班级课题）
Look and say
dirty
not clean
What do you think of their city?
(4人小组，朗读句子，图文匹配。)
Black smoke from factories makes the air dirty too.
Smoke from cars makes the air dirty.
The river is dirty. There’s
rubbish in the water and the fish are dead.
Rubbish makes the streets
messy and dirty.
a
b
c
d
What if you meet new words，you can:
遇到新单词时，你可以:
Teach each other.
Guess from context or pictures.
Ask the teacher.
Tip
Read and match