资源简介

(共21张PPT)
展一：优秀作业
展二：温故知新
1. 如何判断是否为名词性从句？
2. 名词性从句连接词分为几类？分别是什么？
3. 名词性从句的解题步骤是什么？
Chemical Versus Organic Farming
Evaluate chemical farming and organic farming
展三：要点速记
pesticide 杀虫剂
in widespread use 在广泛使用中
introduce:推行；实施；采用
fight crop disease 抵制作物病害
over time 随着时间的流逝
bacteria n (单数bacterium）细菌
as for 至于。
be rich in 富含.....
switch to/turn to 转向，转变
keep---free of/from 使---免受---伤害（或影响等）
through natural means 通过天然的方法
for instance /for example 例如，比如
put down roots 生根；定居
The goal ---is to do 目的是做某事
serve/meet /satisfy the demand (s)for 满足对------需要
nowhere near 远没有；远不及
要点速记
限时5’
pesticide
in widespread use
introduce:
fight crop disease
over time
bacteria n (单数_______）
as for
be rich in
switch to/turn to
keep---free of/from
through natural means
for instance /for example
put down roots
The goal ---is to do
serve/meet the demand (s)for
serve the interests of
nowhere near
探：答疑解惑
Para1
Chemical pesticides and artificial fertilisers have been in widespread use in farming since the middle of the 20th century. When they were first introduced, many farmers welcomed them as a great way to fight crop disease and increase production. Over time, however, what some scientists have found is that their long-term use can sometimes harm both the land and peoples’ health.
Para2
For example, pesticides can damage the land by killing not only harmful bacteria and insects, but also helpful ones. In addition, these chemicals can stay in the soil and underground water sources for a long time. This affects the crops grown on the land and, in turn, the animals and humans who digest them. Many people worry that these chemicals may make them ill and even cause cancer. In fact, some pesticides like DDT have been prohibited in most countries because of the damage they cause to people and the environment. As for chemical fertilisers, crops grown with them usually grow too fast to be rich in nutrition. They may look beautiful on the outside, but inside there is usually more water than essential minerals, and they often have less flavour as well.
Para3
As an alternative, some farmers have switched to organic farming, and many customers have turned to organic food when they shop at the local grocery. Organic farming is simply farming without using any chemicals. Organic farmers focus on keeping their soil rich and free of disease through natural means. For example, many organic farmers use natural waste from animals as fertiliser. This makes the soil in their fields richer in minerals. It also keeps the air, soil, water, and crops free of chemicals.
Para4
Organic farmers also use many other methods to produce rich soil. They often change the kind of crop grown in each field every year. For instance, they may grow corn or wheat in a field one year, and then grow beans there the next. Why different crops are grown is because they put important minerals back into the ground, making it ready for the next batch of crops. Organic farmers also plant diverse crops that used different depths of soil to help keep it rich. For example, peanuts grow on the ground’s surface, but many other vegetables put down deep roots. The goal of using different organic farming methods is to grow good food while avoiding damage to the environment or to people’s health.
Para5
Some people would prefer to stop the use of man-made chemicals in agriculture entirely. What keeps them from doing so is the fact that chemical farming serves the high demand for food around the world. Organic farming is nowhere near able to meet that need. Therefore, there is still a long way to find a suitable solution that puts sufficient food on the dinner table while keeping people and the environment as healthy as possible.
Title
The _______ and _________ of chemical farming.
benefits
problems
Part 1:
(Para 1&2)
What organic farming is and __________________.
how it keep the soil rich
Part 2:
(Para 3&4)
Part 3:
(Para 5)
Conclusion
Presentation
Writing
1.Structure of an argumentative essay:
(Para.1)
(Para.2)
An argumentative essay
Your opinion
Supporting point2
(Para.3)
Supporting point3
Supporting point1
Introduction
Body
Conclusion
Summary
Title
Details
Details
Details
Para.1 state your opinion
Currently, there is a widespread concern over the issue that…
As is often the case, … As far as I am concerned, however, …
It can be said with certainty that ... So in my opinion, …
Nowadays, it has to be noticed that… So I’m convinced that…
2.Useful expressions for writing an argumentative essay:
Para.2 supporting points and details
First of all, there is no denying/doubt that...
On the one hand, … On the other hand, …
Moreover, …. For one thing, … For another,…
Lastly,… A case in point is ...
Similarly, we should pay more attention to...
As has been mentioned above, ...
Personally, I will conclude by saying...
Therefore, I have the reason to believe that...
From what has been discussed above, we may safely draw the conclusion that…
Para.3 give summary
练：学以致用
假如你是李华，学校论坛英文版想邀请你写一篇文章刊登在论坛上，介绍生态农业（organic farming）的情况和人们对此不同的看法。
1.生态农业的现状；
2.生态农业的利弊。
注意：1.词数80左右；
2.可适当增加细节，以使行文连贯。
学以致用
Thank you

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