Learning about Language名师教学设计2

Teaching

plan 教案

Teaching material教材:

PEP Book4 Unit2 Class

班级

:

Class 12 Grade 1高一（12）班

Teacher教师:

Chen Yuhong 陈愉红

一. 教学内容分析

本节课的内容是人教版高一英语必修四第2 单元using language中的阅读部分，标题是CHEMICAL OR ORGANIC FARMING? 这是一篇介绍化学耕作和有机耕作的说明文。此话题与日常生活紧密相关，容易激发学生的学习兴趣，但有较多的专业词汇，对部分学生来说，阅读会有一定的障碍。

二. 学情分析

高一（12）班是文科班，大部分学生的英语基础较好，学习英语的兴趣较浓，但有部分学生英语基础薄弱，词汇量少，对英语有畏学心里。

三.Teaching Goals（教学目标）

Knowledge aims:

words and expressions: chemical, organic, fertilizer, nutrition, mineral, discovery, production, root, lead to, build up, focus on, keep…free from. Ability aims:

1) To help students further develop their reading abilities by fast reading and careful reading. 2) To help students get required information from the passage. 3) To use the language by reading, writing and speaking.

Emotional aim:

To cultivate students’ sense of food safety.

四. Teaching Important Points（教学重点）

1) To get students to read the text and learn something about chemical farming and organic farming. 2) To improve students’ reading skills. 五．Teaching Difficult Points（教学难点）: 1) How to improve students’ reading ability

2) How to help students to form a good habit of reading.

六、Teaching methods: （教学方法）

1) Asking-and-answering activity to check students’ understanding of the text. 2) Individual, pair or group work to finish each task. 七．Teaching Time（教学时间）: 40 minutes 八．Teaching Aid教具: students’ learning paper, a projector

九．Teaching Procedures教学过程:

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Step 1. Students’ presentation ( about 2minutes ) Step 2. Lead –in

( about 4 minutes ) Lead in by showing some food in the pictures and ask students to choose the food that they want to eat. T: Let’s look at some food in the pictures and choose the one you want to eat. Ss: T: Why do you choose the small/big ones? Ss: T: In order to increase the production and stop disease, farmers will use some chemical fertilizers to farm. The food may look beautiful but they are not nutritious. T: How many kind of fertilizers do farmers use? Ss: T: There are two, chemical fertilizers and natural fertilizers. Ok, we’ll read a passage today to learn something about chemical farming and organic farming.

设计意图：通过展示图片并选择自己想要吃的食物进行导入，从而激起学生的兴趣，使学生自然地过渡到本节课的话题。

Step 3. Fast reading

( about 3 minutes ) T: Now let’s read the passage quickly and then match the main idea with each paragraph. You have only 2 minutes. Para 1.

A. the advantages of organic farming. Para 2.

B. some methods of keeping the soil fertile. Para 3.

C. some problems caused by using chemical fertilizers. Para 4.

D. a new discovery of scientists suggested answers: Para 1—D, Para 2—C, Para 3—A, Para 4—B, Step4. Careful reading ( about 15 minutes )

T: Read the passage again and then finish the exercises of task 1 and task 2. Task1: Choose the best answer to each question according to the text.

1. According to the text, which of the following is NOT the problem caused by chemical fertilizer?_______ A. Crop diseases can be stopped. B. Chemicals stay in the ground and underground water for a long time. C. The helpful bacteria and pests are killed as well as the harmful one.

D. Many of these fertilizers are dangerous to people’s health.

2. From the passage, we can see organic farmers are those who

_______. A. grow crops with chemical fertilizers.

B. grow crops with natural fertilizers. C. produce organic fertilizers.

D. care for the environment.

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3. From the last paragraph, we know that ______. A. peas and soybeans should be grown together with corn and wheat. B. peanuts use the surface of soil. C. it’s not good to plant grass between crops.

D. vegetables that put down deep roots are harmful to the soil. 4. In paragraph three the word “waste” most nearly means

. A.浪费

B. 荒地

C. 粪便

D. 废品

suggested answers:1—4 ABBC

Task2: Use the information in the passage to fill the following blanks. Chemical farming

problems

damage the land affect crops lead to cancer/illnesses have less nutrition

Organic farming

methods use natural waste plant crops with different roots plant grass between crops

advantages make the soil rich in ________ use different _________of land

prevent________________ from___________, leaving it in the ground to become a________.

cause

by killing…

by staying…

by

building up…

by growing too…

设计意图：通过多种形式的练习来训练学生从文章中获取所需信息的能力。

Step 5. Discussion. ( about 12 minutes ) Topic: If you were a farmer, which kind of farming would you like to choose? Why? T: It’s time for us to have a discussion. In this part, you’re required to cooperate with your partners. You have 6 minutes to discuss the topic. After that I will have some of you to to give us a presentation.

设计意图：通过让学生以讨论的方式把文章中的词汇运用出来，达到学以致用的目的，同时训练学生英语表达的能力。

Step 6.

Summary ( about 2 minutes )

T: The passage tells us something about chemical farming and organic farming. After class, please read the text again and recite some useful sentences in the text.

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Step 7.

Homework

( about 2 minutes ) 运用课文第一段和第二段中的句式，仿写下面的小作文

在过去的几年里，抽烟在中学生中已经非常普遍。很多学生喜欢把抽烟作为一种非常好的放松和耍酷方式。然而，抽烟会损害人们的健康。

首先，吸烟会导致很多疾病。其次，吸烟浪费金钱。

总之，为了我们的健康，我们不应该抽烟，特别是中学生。

设计意图：通过让学生仿写作文，这是对所学文章的巩固和升华，同时也是对学生英语写作能力的训练。

附录：课文原文和翻译

CHEMICAL OR ORGANIC FARMING?

Over the past half century, using chemical fertilizers has become very common in farming. Many farmers welcomed them as a great way to stop crop disease and increase production. Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land and, even more dangerous, to people's health.

What are some of the problems caused by chemical fertilizers? First, they damage the land by killing the helpful bacteria and pests as well as the harmful ones. Chemicals also stay in the ground and underground water for a long time. This affects crops and, therefore, animals and humans, since chemicals get inside the crops and cannot just be washed off. These chemicals in the food supply build up in people's bodies over time. Many of these chemicals can lead to cancer or other illnesses. In addition, fruit, vegetables and other food grown with chemical fertilizers usually grow too fast to be full of much nutrition. They may look beautiful, but inside there is usually more water than vitamins and minerals.

With these discoveries, some farmers and many customers are beginning to turn to organic farming. Organic farming is simply farming without using any chemicals. They focus on keeping their soil rich and free of disease. A healthy soil reduces disease and helps crops grow strong and healthy. Organic farmers, therefore, often prefer using natural waste from animals as fertilizer. They feel that this makes the soil in their fields richer in minerals and so more fertile. This also keeps the air, soil, water and crops free from chemicals.

Organic farmers also use many other methods to keep the soil fertile. They often change the kind of crop in each field every few years, for example, growing corn or wheat and then the next year peas or soybeans. Crops such as peas or soybeans put important minerals back into the soil, making it ready for crops such as wheat or corn that need rich and fertile soil. Organic farmers also plant crops to use different levels

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of soil, for example, planting peanuts that use the ground's surface followed by vegetables that put down deep roots. Some organic farmers prefer planting grass between crops to prevent wind or water from carrying away the soil, and then leaving it in the ground to become a natural fertilizer for the next year's crop. These many different organic farming methods have the same goal: to grow good food and avoid damaging the environment or people's health. 译文：

化学耕作还是有机耕作？

在过去的半个世纪里，在耕作中使用化肥已经非常普遍。很多农民喜欢使用化肥，把化肥作为防治病虫害和提高产量的重量手段。然而，最近科学家发现长期使用这些肥料会造成土地受损，甚至更危险的是，会对人们的健康造成危害。

化肥带来的问题有哪些呢？首先，化肥在杀死病菌和害虫的同时也会杀死有益的细菌和昆虫，从而破坏土地。化学物质还会在地里和地下水保存很长时间，而这会影响到农作物，进而影响到动物和人类，因为化学物质会进入到农作物中，并且不能被冲洗掉。随着时间的推移，食物中的这些化学成分会在人体中堆积。很多化学物质会导致癌症或其他疾病。另外，施过化肥的水果、蔬菜和其它食物

通常生长得过快而营养不足。它们表面上很好看，但是里面通常含太多的水分，而不是维他命和矿物质。

由于这些发现，一些农民和消费者开始转向有机耕作。有机耕作就是不用任何化学肥料的耕作。农民关心的是保持土壤肥沃并且免受病害。健康的土壤会减少病虫害并且帮助农作物茁壮成长。因此，有机耕作的农民通常喜欢把天然的动物粪便当做肥料。他们认为这样会使地里的土壤更富含矿物质，因而也会更加肥沃，同时还可以让空气、土壤、水以及农作物不受化学物质的污染。

有机耕作的农民也使用很多其他的方法来保持土壤肥沃。在同一块地里，他们经常每隔几年就换种农作物。例如，种玉米或小麦后来年再改种豌豆或大豆。像豌豆或大豆这样的农作物将重要的矿物质带回土壤，从而使之适宜于种植要求土壤肥沃的农作物，比如玉米或小米。有机耕作的农民还种植多种农作物来利用不同层次的土壤。比如，他们先种植生长于浅层土壤的花生，然后再种植生根于深层土壤的蔬菜。还有一些有机耕作者喜欢在农作物之间种草，以防止水土流失，并且把草留在地里，从而成为来年农作物的天然肥料。这些不同的有机耕作的方法有着同样的目标：种植好的粮食，避免损害环境或者人们的健康。

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