九年级英语Unit13第2课时教案

Period 2 Section A (3a-3c)

【知识与能力目标】

1.掌握重点单词及短语。

2.复习语法：能正确区分和使用以下语法结构：现在进行时，现在完成时，被动语态，情态动词和used to 句型。

【过程与方法目标】

本课主要采用任务型教学法，情景教学法以及多媒体辅助教学，充分发挥教师的主导作用和学生的主体地位。利用现代化教育技术优化教学过程，通过课件为学生创设更多生动活泼的语言环境，把学生吸引到活动中去，并激发他们主动参与学习的欲望，努力培养学生自主学习的能力。

【情感态度价值观目标】

通过学习具有环境危机意识，学会关注环境保护环境。

【教学重点】

1.掌握本部分出现的生词和词组，达到熟练运用的目标。

2. 阅读短文，获得相关的信息。通过阅读练习，来提高阅读能力。

【教学难点】

1.阅读短文，获得相关的信息的能力。

2. 理解并运用所学的词汇及表达方式。

【教学步骤】

Step 1. Revision

Translation.

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。

Step 2. Warm- up

1. T: 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! Step

3. Discussion

1. What do you know about shark(鲨鱼)?

2. Do you think sharks can be endangered? Why?

3. What do you think might cause a fall in the number of sharks?

Step 4. Reading

1. Complete the fact sheet in 3a.

Where shark fin soup is popular

Number of sharks caught

and traded every year

How much the numbers of

some kinds of sharks have

fallen in the last 20 to 30

years

Two environmental groups

which are against “finning”

2. Retell the passage.

shark’s fin soup, in southern China

each time cut off no longer not only…but also…

at the top drop be endangered the strongest around 70 million fallen by over 90 percent Wild Aid and the WWF develop laws scientific studies

Step 5. Practice (Work on 3b)

Read the passage and fill in the blanks with the words in the box.

1) Many people do not realize they are killing a whole shark ______ they enjoy a bowl of shark fin soup.

2) Sharks are at the top of the food chain, ____ if their numbers drop, the ocean’s ecosystem will be in danger.

3) Many think that sharks are too strong to be endangered, _____ they are wrong.

4) _________ there are no scientific studies to support this, a lot of people believe that shark fins are good for health.

5) Sharks may disappear one day ___ we do not do something to stop the sale of shark fins.

Step 6. Language points

1. A shark can no longer swim and slowly dies. 鲨鱼不能再游泳然后慢慢死掉。

no longer意思是“不再”, 相当于not any longer。

e.g. Mr Brown no longer works here. 布朗先生不再在这里工作了。

2. This method is not only cruel, but also harmful to the environment.这种方法不但残忍而且对环境有害。

not only…but also…

用于连接两个表示并列关系的成分，着重强调后者，其意为“不仅……而且……”; 其中的also有时可以省略。

e.g. 1) She not only plays well, but also writes music.她不仅很会演奏，而且还会作曲。

2) Not only men but also women were chosen. 不仅仅是男的，女的也有被选中的。

若连接两个成分作主语，其谓语通常与靠近的主语保持一致。

e.g. Not only you but also he has to leave. 不只是你，他也得离开。

not only放在句首，后接句子时要用倒装结构。

e.g. Not only had the poor man been fined, but also he had been sent to prison.

这个可怜的人不仅被罚款，而且还被送进了监狱。

be harmful to 对…… 有害

e.g. Smoking is harmful to the health. 吸烟有害健康。

Playing computer games much is harmful to students.电脑游戏玩太多对学生有害。

3. Sharks are at the top of the food chain in the ocean’s ecosystem. 鲨鱼位于海洋生物系统食物链的顶部。

at the top of 在...最高地位; 用最高[最大]的(速度, 声音等)

e.g. He shouted at the top of his voice in order that he might be heard.他尽力大声叫喊, 以便别人能听见。

4. If their numbers drop too low, it will bring danger to all ocean life.

如果它们的数目降至过低，会给所有海洋生物带来危险。

此句复数形式的number表达全海洋中鲨鱼的总量。当表示数值的高或低时，number要用high或low修饰。e.g. In that country, the number of children going to school is higher in cities than in towns and village.

在那个国家，城市儿童入学人数比乡镇及农村要高。

常与number搭配的动词有grow, fall等。

e.g. The number of families that own cars has been growing quickly recently.近来拥有轿车的家庭数量增长很快。Step 7Homework

Write 5 measures to protect the environment.