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新人教版必修四Unit2 Using language课件


Words preview
chemical bacteria pest nutrition mineral adj. 化学的;关于化学的 n. 细菌 n. 害虫;害兽;害鸟 production n. 生产;制造

n. 营养;滋养;食物
n. 矿物;矿石

Words preview
discovery

focus soil reduce root n. 发现;发觉 n. 焦点;中心点 vt. 集中;聚焦 n. 土壤 vt. 减少;减缩 n. 根;根源

Words preview
skim summary comment vt. 浏览;略读 n. 总结;摘要;概要 n. 评论;议论 vi.& vt. 表达意见; 做出评论

underline vt. 画底线标出;强调

Expressions preview
build up lead to focus on from/of 逐渐增强; 建立; 开发 导致; 造成 (后果) 集中 (注意力,精力等) 于

keep… free 使…免受(影响,伤害等); 使…不含(有害物)

Organic Farming

What are genetically-modified foods?
The term GM foods or GMOs (genetically-modified organisms) is most commonly used to refer to crop plants created for human or animal consumption using the latest molecular biology techniques.

What are some of the advantages of GM foods? The world population has topped 6 billion people and is predicted to double in the next 50 years. Ensuring an adequate food supply for this booming population is going to be a major challenge in the years to come. GM foods promise to meet this need in a number of ways:

1).pest resistance
2).disease resistance 3).cold tolerance

4).drought tolerance/salinity
tolerance

5).nutrition

What are some of the criticisms

against GM foods?
Most concerns about GM foods

fall into three categories:
environmental hazards, human health risks, and economic

concerns.

Read and answer:
What is the main idea of this passage?

This passage tells us something about organic farming. It means growing crops without chemical fertilizers which damage the soil. The organic farmers keep the soilrich and healthy in several ways.

Read the passage and answer the following questions.
1 Why are chemical fertilizers so popular in farming today? 2 What problems can be caused by using chemical fertilizers? 3 What is organic farming? 4 What is the main reason for using organic farming methods?

1 Why are chemical fertilizers so popular in farming today?

They are a great way to stop crop
disease and increase production.

2 What problems can be caused by using chemical fertilizers? They can damage the land by killing helpful bacteria and pets and by staying in the ground and underground water for a long time, They damage people's health by building up in their bodies and leading to cancer or other illnesses.

3 What is organic farming? Organic farming means growing crops without using any chemicals.
4 What is the main reason for using organic farming methods? The main reason for using organic farming methods is to grow good food and to avoid damaging the environment or people’s health.

Find and write down the methods and advantages in the passage.
Methods of organic farming Farmers use natural waste from animals. Advantages of methods This makes the soil richer in minerals and so more fertile.

Methods of organic farming 1 Farmers use natural waste from animals. 2 Farmers often change the kind of crop in each field every few years.

Advantages of methods 1 This makes the soil richer in minerals and so more fertile. 2 Changing the crops renews the minerals in the soil and helps it become rich and healthy.

Methods of organic farming 3 Farmers plant crops with different lengths of roots. 4 Farmers sometimes plant grass between crops and leave it in the ground.

Advantages of methods 3 This uses different levels of soil. 4 This prevents wind or water from carrying away soil and acts as a natural fertilizer.

Language points
1 These chemicals in the food supply build up in people’s bodies over time. build up 增强; 建立;开发 Hard working conditions build up character. 艰苦的工作条件能磨练人的性格。

2 Many of these chemicals can lead to cancer or other illnesses. lead to: 导致;造成 Too much work and too little rest often lead to illness. 过量的工作和过少的休息会引起疾病。 All roads lead to Rome. 条条大道通罗马。

3 They focus on keeping their soil rich and free of disease.

focus on:集中(注意力,精力等)于
You should focus your attention on your work. 把注意力集中在你的工作上。

Olympus: Focus on life. 奥林巴斯:瞄准生活。

4 This also keeps the air, soil, water and crops free from chemicals. keeps… free from /of: 使…免受(影 响,伤害登);使不含(有害物) keep from: 阻止; 妨碍 I hope you will keep from doing anything rash. 我希望你不要做出任何鲁莽的事情来。

Listening

用化学肥料和有机肥料的区别:

cow dung

chemical fertilizer

As you listen to this dialogue, keep in mind what you have just read about chemical fertilizers. What is the main topic of the conversation?
The possible bad effects of chemical

fertilizers on the fruit and vegetables
that we eat today.

Listen to the dialogue a second time. Decide if the following statements are true or false, according to the conversation. Give your reasons.
1 Paul thinks that Carrie is not telling him the truth. True 2 Using chemical fertilizers always makes vegetables empty inside. False

3 Today’s fruit is not as healthy for people as fruit fifty years ago. True

4 Eating more vegetables might not
always be good for us. False

5 All of today’s vegetables look
healthy but in fact are not. True

Listening text
WHAT’S WRONG WITH THE VEGETABLES? Girl: Hey, Paul, listen to this … a magazine article about a farmer who used too much chemical fertilizer on his fields. When his vegetables were picked, they were all found to be empty!

BOY: Empty? You’re joking, Carrie … that can’t be true! Girl: I didn’t believe it either! This article says this can happen sometimes with vegetables like cucumbers, carrots and pumpkins. This chemical fertilizer makes the vegetables grow fast to look big and beautiful, but they’re empty inside!

BOY: You know, I’ve noticed that sometimes my mum buys carrots from the supermarket that have big holes down the center. I guess that must be from using chemical fertilizers! GIRL: Yeah, that’s what the magazine says! The main point of the article, though, isn’t about holes in our vegetables.

It’s talking about why the fruit and vegetables we eat today aren’t as nutritious as the ones our grandparents ate. BOY: What? My mum is always telling me to eat more vegetables, because they’re good for me! GIRL: Yeah, I know – my mother says that same thing! And it’s true -

they are good for us… but the
problem is that they aren’t healthy enough! All these chemical fertilizers – they kill off both the bad and the good things in the ground. The ground doesn’t have enough vitamins and minerals any more to help crops grow

healthy.

BOY: So … if our fruit and vegetables were grown with chemical fertilizers, they might look healthy, but probably aren’t really healthy? I guess we’ve got to stop using so many chemical fertilizers to grow our food!

Write a summary of the text following the procedure on page 15.


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