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1. Show some pictures and present the new words.
2. Read aloud the new words.
dig
serious
breadfruit
reduce
turn off
recycle
cause
wise
vt. & vi. 挖（洞，沟等）
adj. 认真的，严肃的
n. 面包果
vt. & vi. 减少，降低
关上（开关）
vt. 回收利用，循环利用
vt. 导致；造成
adj. 明智的，充满智慧的 divide ino 3 groups, and play game .
Step 3 Comic strip
1. Listen to the tape and answer the questions.
1) Why does Hobo want to plant more trees?
2) Does Eddie want to go with Hobo?
3) What does Eddie want to plant?
2. Act out the conversation.
Step 4 Welcome to the unit
1. Do Part A on page 117.
2. Check the answers.
Step 5 Brainstorm
Our planet is in trouble! We should try our best to protect the environment. What else can we do?
Turn off computers when are not using them.