人教版B4 Unit 2 Working the land Using language课件（36张）

课件36张PPT。人教课标
高一 必修 4
Unit 2Unit 2
Working the landUsing LanguageWhat is the substance we put on the soil which makes crops grow?
It is fertilizer. How many kinds of fertilizers do farmers use?
There are two kinds. They are chemical fertilizers and natural ones. Which kind do farmers use when they are doing organic farming?
Do you know about organic farming? ORGANIC FARMING
Organic farming is simply farming without using any chemicals.Scan the passage and get the main idea of it.Chemical fertilizers can cause many
problems, so organic farming is
becoming more popular.1. Why are chemical fertilizers so popular in farming today?Read the passage and answer the
following questions.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 pests 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. Read the passage carefully and fill in the blanks.productionbacteria and pestsnutritionGoalgrassnaturalthe kind of cropdifferent levelsIn what condition do you think green food grow?dirty air
dirty water supplies
in industrial areas
many chemical fertilizersclean, fresh air
clean water supplies
away from industrial areas free of chemical fertilizersProjectPersuade farmers to grow the crops by organic farming with the knowledge learnt. What is organic farming?
What fertilizer should they use? Why?
How to plant the different crops?
...1. Many of these chemicals can lead to cancer ...
lead to 用法
[寓词于境] 阅读下列句子，注意lead to的意思和用法。
1) His carelessness led to the accident.
2) This test is obviously bad because it leads to incorrect learning.
3) Too much work and too little rest often leads to illness.Language points[自我归纳]
lead to意为“_________________”, 后多跟名词或代词。导致、造成(后果)[联想]
result in引起(某种结果)、使获得(某种成果)、结果……。如：
The accident resulted in two deaths.
result from由……造成、因……而产生。如：
Sickness sometimes results from eating too much. [即学即练]
用lead to的适当形式完成句子。
1. Students should always remember that hard work is the main way which _______ success.
2. The bad weather _____ a terrible accident a few days ago.led toleads to2. They focus on keeping their soil rich and free of disease.
focus用法
根据语境推断focus在下列句子中的含义, 并从a-d中找出与每句话中的focus相符合的英文释义。1. The focus of the meeting changed from population growth to the education of women.
2. Bring the object into focus if you want a clear photograph.
3. She tried to focus her mind on her work.
4. She turned the camera and focused on Martin’s face.
a. the thing, person, situation, etc. that people pay special attention to
b. a point or distance at which the outline of an object is clearly seen by the eye or through a lens
c. to point a camera at something, and change the controls slightly so that you can see that thing clearly
d. to give special attention to one particular person or thing, or to make people do thisc abdfocus n. 意为“焦点、中心点”;
v. 意为“集中、聚焦”
常构成短语 focus on, 意为“集中(注意力、精力等)于”。
翻译下列句子。
1. Because of his strange clothes, he immediately became the focus of attention when he entered the office. 由于他的奇装异服, 所以一走进办公
室他便成了大家注意的焦点。2. Focus your camera on those trees.
3. I’m so tired that I can’t focus on anything today.把照相机的焦点集中在那些树上。
今天我太累了, 精神集中不起来。3. This also keeps the air, soil, water and crops free from chemicals.
keep … free from “远离”或“避免”keep free from emotional reactions 避免激动的反应 keep free from restrictions 避免受到限制 4. 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. [分析]
①本句结构比较复杂。其主干结构为: 主句(Crops put important minerals back into the soil) + 状语(making it ready for crops)。
②状语中又包含“make + it + 形容词”结构和由that引导的定语从句(that need rich and fertile soil)。 5. 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.
[分析]
①本句的主干结构是一个简单句, 其结构是: 主语(farmers) + 谓语(prefer) + 并列宾语(planting ... + leaving ...)。②其中between crops和in the ground作地点状语。
③两个宾语后面又分别带有一个不定式作目的状语（to prevent wind or water from carrying away the soil和to become a natural fertilizer for the next year’s crop）。 What is the main topic of the conversation?
The possible bad effects of chemical fertilizers on the fruit and vegetables that we eat today. Listening1. Paul thinks that Carrie is not telling
him the truth.
2. Using chemical fertilizers always
makes vegetables empty inside.
3. Today’s fruit is not as healthy for
people as fruit fifty years ago.Listen to the dialogue again and decide if the following statement are true or false. T FT 4. Eating more vegetables might not
always be good for us.
5. All of today’s vegetables look healthy
but in fact are not.FT Collect some information about the safety and importance of green food.Homework