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We should help save the sharks.
2. 技能目标: 能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。
3. 情感目标: 有环境危机意识，学会关注环境保护环境。
二、教学重难点：
1. 教学重点：（1）能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。
（2）保护环境的措施方法。
2. 教学难点：能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。三、教学步骤:
Section A 2 (3a-3b)
I. Revision
Role-play 2d.
Translate these sentences into English.
①甚至是河底都满是垃圾。
②这个小镇上的每个人都应该参加打扫。
③骑自行车有其它的优点。
④我买外卖食品从来不拿木筷子和塑料叉子。
II. Lead in
(1) Teacher tells students the earth is badly polluted. What should we do to save the earth? Let’s take action. For example:
①Turn off the lights when you leave a room;
②Take buses instead of driving cars
③Recycle books and paper.
(2) There are some animals are endangered. We should do something to protect the animals and the environment!
III. Discussion
(1) Have you ever seen a shark?
(2) What do you know about sharks?
IV. Reading
Sharks are endangered, read the passage and judge the sentences.
①Shark’s fin（鱼鳍）soup is famous and expensive all around the world.
②We have to kill a whole shark to get a bowl of shark’s fin soup.
③People cut off sharks’ fins and throw the sharks back into the ocean.
④Sharks are in the bottom of the food chain in the ocean’s ecosystem.