湖南省茶陵县高中英语Unit3Tomorrow’s（课件教案）（打包23套）牛津译林版必修4
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　　Finding foods for the future
　　随着世界人口增长和气候变化，人类在未来可能会面临食物短缺的问题。目前，许多科学家和研究人员正在与时间赛跑，试图找到好的解决办法。
　　People need to find out new foods because the world has so many mouths to feed. As of 2015, there are more than seven billion people on Earth, according to the United Nations. And by 2100 that number may double, according to some predictions(预测). Feeding all of these people means not only improving the way food is grown, but also finding new sources of foods. And that need is becoming ever more urgent. If nothing changes, within 35 years, the world’s appetite (胃口) wi ll be greater than the amou nt of food produced. That’s according to a report released last year. It was prepared by the Global Harvest Initiative, a private agriculture group based inWashington, D.C.
　　Global warming, too, is changing food production. Scientists predict that rising temperatures will reduce the growth of important  crops like wheat and corn. Low-income developing countries  will be hit the hardest. When  harvests fall, crops become more expensive. And since those foods are also used to feed animals like cows and pigs, meat prices, too, will rise.
　　All over the world, resea rchers are racing against the clock to figure out how best to feed more people in the future. And some surprising ideas have begun to appear. Three years ago, scientists showed the first hamburger made from meat grown in a lab. Other researchers are developing seeds that can manage to live even du ring high temperatures and drought. Still others are finding ways to change the genes (基因) of meat animals so they produce more me at and can stand the heat.  For example, researchers in South Korea and China are looking into developing a super-pig. These researchers have changed  the genes in a type of pig to create an animal that becomes bigger and heavier, packing on more muscle (肌肉). Typically, muscle tissue is the part of an animal that becomes meat for food. Biologist Jin-Soo Kim at Seoul National University in South Korea leads super-pig research there.
　　Kim sees a lot of possible uses for the editing technology. Such gene correction, he says, might help improve crops, fish and livesto ck (家畜) kept on a farm. “We’re now working on changing genes in other large animals, such as dogs and cows,”he says.
　　Don’t go looking for super-bacon at your local grocery just yet. Animals with genes changed in the lab haven’t yet been  approved for eating. More studies will be needed to mare that they’re safe. But Kim and his workmates hope that day won’t be far away.
　　Unit 3  Tomorrow’ world
　　Grammar and usage
　　The passive voice & Modal verbs and the passive voice & Verbs often used in the passive voice
　　Teaching Aims:
　　1. Enable students to learn the basic verb forms of the passive voice.
　　2. Enable students to learn how to use modal verbs in the passive voice.
　　3. Madents learn some verbs that are often used in Passive Voice.
　　4. Help the students to learn how to use the passive voice in a reporting article.
　　Teaching Important and Difficult Points:
　　1. The use of the passive voice.
　　2. How to teach the students to use passive voice in different tenses.
　　Teaching Approaches:
　　Explaining and practicing
　　Teaching Aids:
　　Multimedia and a blackboard
　　Teaching Procedures:
　　ⅠThe passive voice
　　In this step the students will learn the interchange between the passive voice and the active voice, the basic verb form of the passive voice, and some special passive patterns.
　　Step 1 Lead-in
　　Show some pictures to help students to something about the passive voice and also introduce the verb, the subject and the object in the sentences
　　Step  2 Practice
　　1. Change the following sentences into the passive voice:
　　1) The cat plays the ball.
　　2) You are writing a letter.
　　3) Sharon will bring some books.
　　4) My mum bought a bag for me.
　　5) Jane was doing her homework.
　　6) We had painted some pictures before you came.
　　7) I am going to water the flower s.
　　8) He told me that they would hold the meeting the next day.
　　2. Make a list of the passive voic e in the different tenses by showing two pictures.
　　3. Fill in the blanks to consolidate wha t they have learnt.
　　1) I ___________ (give) a new book by my father on my birthday.  was given
　　2) English ___________ (find) very useful.  is found
　　3) The picture ______________ (finish) tomorrow.  will be finished
　　4) The bike ______________ (repair) by them now.   is being repaired
　　5) The building__ _______________ ( build) this time last year.  was being built
　　6) How ______ the flags already _______________(make) ?    have been made
　　7) The new railway ___________ (build) by the end of last year.  had been built
　　8) What_________________ (discuss) now?   is being discussed
　　9) Rice ___________ (grow) in the south of the States.   is grown
　　10) Jane said her friends_______________ (invite) to her birthday party the next week.     would be invited
　　Step 3 Model verbs and the passive voice
　　1. Introduce the model verbs in the passive voice by showing two sentences. And tell them the structure:
　　Unit 3 Tomorrow’s World Grammar
　　被动语态用法小结
　　【语境展示】
　　1. The three words are pronounced in the same way.
　　2. They were given a warm send-off at the airport.
　　3. The matter will be looked into in the future.
　　4. I didn’t expect that I would be asked to speak.
　　5. The children are being taken care of by their aunt.
　　6. A new supersonic aircraft was being designed.
　　7. They have been warned not to swim there.
　　8. He told me that the factory had been closed dow n .
　　【归纳】
　　语态是动词的一种形式，用以表示主语和谓语之间的关系。英语的语态分为两种：主动语态和被动语态。主动语态表示主语是动作的执行者；被动语态表示主语是动作的承受者。被动语态常用于以下几种情况：
　　1. 不知道动作的执行者是谁。如：
　　Printing was introduced into Europe from China.
　　2. 不必提到动作的执行者。如：
　　Such things are not done twice.
　　3. 强调或侧重动作的承受者。如：
　　The girl is liked by everybody.
　　一、被动语态的构成
　　被动语态的基本形式是“be + V-ed 形式”。通过改变be 的时态，可以构成不同时态的被动语态。
　　二、各个时态的被动语态的构成
　　1. 一般现在时的被动语态：am / is / are + V -ed 形式(如例句1)
　　2. 一般过去时的被动语态：was / were + V-ed 形式(如例句2)
　　3. 一般将来时的被动语态：will + be + V-ed 形式(如例句3)
　　4. 一般过去将来时的被动语态：would + be + V-ed形式(如例句4)
　　5. 现在进行时的被动语态：am / is / are + being +V-ed形式(如例句5)
　　6. 过去进行时的被动语态：was / were + being +V-ed形式(如例句6)
　　7. 现在完成时的被动语态：has / have + been +V-ed形式(如例句7)
　　8. 过去完成时的被动语态：had + been + V-ed 形式(如例句8)
　　其他时态或没有被动语态，或极少用被动语态。
　　三、一些特殊结构的被动形式
　　1. 双宾动词的被动结构。有些双宾动词（如give，lend ，offer，send，show，tell 等）可用 于被动结构，在多数情况下都把间接宾语变为主语，而把直接宾语保留下来。有时也可把直接宾语变为主语，把间接宾语改为to 引导的短语。如：
　　I was given a gift on my birthday.
　　A gift was given to me on my birthday.
　　2.“be + V-ed形式+ 动词不定式”结构。如：