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教学过程：
Step 1 Pre-reading
Guessing game
Talk about the Earth with the students
We live with our families on Earth.
We study on Earth.
We work on Earth.
(PPT)The Earth is sad.
There are many plastic bags and plastic bottles. (Learn: plastic)
People cut down trees for coal and oil. (Learn: coal&oil)
We can do something to protect the Earth.
(Learn: protect)
Step 2 While-reading
Read and find
Read the passage quickly and find out the answer in 2 ~ 5 words.
Q: How can we protect the Earth?
Save water Save energy Save trees Don’t use too much plastic
Read and underline
Q: Why should we save water?
Q: How should we save water?
Water is useful. We can use water to…
Learn the water situation in China and Nanjing.
Q: How can we reuse water?
Work in 4
Each group pick one topic from “Save energy”, “Save tree” and “Don’t use too much plastic”.
Try to find “why” and “ how”.
Let the students report the reason and the way to do that
Step 3 After-reading
make a poster
Rules: