Unit 13 We're trying to save the earth!
The Second Period—Section A(3a－4c)
Teaching Important Points 【教学重点】 Key words & phrases：
cruel，harmful，industry，law，scientific，afford
be harmful to，at the top of，the food chain，take part in，turn off，pay for，take action
Key sentences：
1.Many have heard of shark fin soup.
2.If their numbers drop too low，it will bring danger to all ocean life.
3.The numbers of some kinds of sharks have fallen by over 90 percent in the last 20 to 30 years.
4.So far，no scientific studies have shown that shark fins are good for health，so why eat them?
Key structure：
Review of tenses：be＋doing；used to＋do；have/has＋done；be＋done；should＋do
Teaching Difficult Points 【教学难点】
★Practice the structures to talk about pollution and environmental protection in reading.
Teaching Aids 【教学工具】
A tape recorder，CAI or multimedia courseware.
Teaching Steps 【教学过程】 ★Step 1 Leading in 【新课导入】 1．Greeting 2．Brainstorming
Quickly ask questions about how to protect the environment.Like this：
What are your ideas for solving the air/waste pollution problem？… 3．Ask students to role－play the conversation in 2d. ★Step 2 Cooperative inquiry 【合作探究】 1．Finish the task in 3a
①Talk about the protection of endangered animals in our country. ②Show pictures of sharks.
Ask questions and think about these things： What do you know about sharks?
Do you know sharks are endangered？Why?
What might have caused a fall in the number of sharks?
Discuss with students and present the new words.shark，fin，method，be harmful to，the food chain，ecosystem
③Quickly read the article and check their answers to these questions.Help students to lear