1、Unit 3 Science Versus NaturePeriod Four Task Skills building 1:changing or correcting a textWe are often asked to do things like filling in a form or taking down telephone numbers,names and addresses.When information is passed between people,it often contains mistakes.Such information must be checke
2、d and corrected when it is recorded incorrectly.For example:1.You may have to correct grammatical errors and spelling mistakes.2.You may have to make changes to the information in the text.3.You may need to change the style or tone of the text.Remember to:1.read the questions or instructions careful
3、ly 2.listen closely when spellings are given 3.pay attention to words or phrases that express contradiction,such as:No,I dont think so.Thats not right.Are you sure?And I think it should be Listen to the tape and correct the following sentences.1.Legs can be lengthened by up to 8cm.2.Legs are made to
4、 grow 1mm per week.3.The new bone is not as strong as the original bone.18cmevery dayPassage One4.A 45-year-old man died after trying to grow by 6cm.5.Patients cant do any exercise for three years.6.It takes 14 months to increase your height by 12cm.7.Age of patients:16 to 55.8.5%of operations are u
5、nsuccessful.9.Costs RMB185,000.A 35-year-oldtwo18608%8500Tapescript:M:Hi,Catherine.What are you doing?C:Just going over our notes on height-increasing operations.M:Yes,it took us a long time to finish them.Whats the problem?C:I cant read some of my writing,so perhaps we can go over the notes togethe
6、r so I can check for any mistakes.M:Yes,sure.Ill try to remember what we said before.C:According to my notes,the doctors break the bones of your legs and then make them grow by about eight centimeters?M:I think youve got that wrong.The doctors can make them grow by about eighteen centimeters.C:Thats
7、 one millimeter per week,right?M:No.Every day.C:Yes,I see.So,the bone is not as strong as the original?M:The bone is as strong as the original.C:Oh!I also wrote that a forty-five-year old man dies after trying to make his legs grow by six centimeters?M:No,he was only thirty-five years old.C:Thats yo
8、ung!When the operation is complete,patients cant do any exercise for three years.Is that right?M:No!After two years.C:Wow!I got a lot of this wrong then.What about increasing your height by twelve centimeters in fourteen months?M:No,eighteen months.C:And the age of the patients who can have this ope
9、ration.It is between sixteen and fifty-five.M:No,that should be between 16 to 60.C:And how many operations are unsuccessful?M:8%.C:And the cost is RMB185000.M:No,its about RMB8500.C:Phew.I did get a lot of things wrong,but I think thats all.Thanks for having such a good memory.I will see you tomorro
10、w.Bye.M:Ok.I will look over the note when you have typed them.Bye,now.Genetically Modified(GM)food Passage twocherry tomato 含乙肝疫苗的转基因土豆含乙肝疫苗的转基因土豆Listen and correct the following notes1.Growth hormones are used in meat,eggs and vegetables.2.Growth hormones make animals grow fatter.3.Growth hormones
11、keep animals healthy.fasterdont help keep animals healthy.4.GM food is more expensive than natural food.5.GM food technology is a new scientific development.6.GM food tastes better than natural food.7.Free-range food comes from animals that are given drugs.cheaperisnt the same as arent 8.Free-range
12、food is cheaper than GM food.9.Free-range animals are kept in dark sheds.10.Most people wouldnt pay more for free-range food.more expensive arentdont mind paying Tapescritp:S=Student S=ScientistS:Thank you for taking the time to come and talk to us about GM food.S:Its my pleasure.S:Im glad I have th
13、e opportunity to talk to you before the lecture.Id like to ask some questions.S:Ok,what would you like to know?S:Well,why are growth hormones used in meat,eggs and vegetables?S:Actually,theyre only used in meat.S:Oh,I dont know that.Why do farmers use growth hormones?S:They use them in order to make
14、 animals grow faster.S:I guess hormones can also keep animal healthy.S:No,thats not true.The hormones dont help keep them healthy.They can still become ill.S:Oh!I didnt now that.So what are the advantages of GM food then?S:Well,its cheaper than natural food because the amount produced is usually lar
15、ger.S:I see.But isnt it dangerous?S:Not at all.Farmers have been using GM food technology for years.Theres nothing new about it.S:Really?Ive never tried GM food.But Ive heard that it doesnt taste the same as natural food.S:I dont think thats true.Taste tests reveal that it tastes exactly the same as
16、 natural food.S:Well,that good to know.What about free-range food?What does that mean?S:Free-range food comes from animals that are not given drugs.S:That means its cheaper than GM food,right?S:No,its actually more expensive.Free-range animals grow less quickly.Farmers have few animals to see,so the
17、y tend to sell them at a higher price.S:But,dont free-range animals have a better life?S:Yes,thats true.Free-range animals live outside in fields.They are not kept in dark sheds.Thats why we call it free-range food,because the animals are free.S:Well,in that case I would rather pay a little bit more
18、 money to buy free-range food.S:Many people feel that way.They dont mind paying a bit more to give the animals a better life.We all have the right to decide what we eat.Useful expressionsAsking for peoples opinionsWhat do you think?What are your thoughts on this topic?Dont you think so?Do you agree?
19、Do you feel the same about.?Is that your opinion too?Skills building 2:conducting a discussionIntroducing new ideas into the discussion Another argument is thatAnother way of looking at it is Dont forgetBut what about?On the other hand,Have you thought about?We can alsoYoure going to interview anoth
20、er scientist about GM food.Add a sixth heading and write some questions next to the headings.subject questions safety of GM FoodDo you think its safety for people to have GM food?subject questions Possible side effectsTaste compared with normal foodAre there any side effects if people have GM food?D
21、oes it taste the same as/nicer than natural food?subject questions CostNeed for government controlIs it more expensive?Do you think the government should do something to ensure its safety?If so,what should be done?subject questions Popularity for buyersWill you or will you not buy the GM food?Make u
22、p a dialogue between the student and the scientist according to the six headings and the six questions.You can refer to the following expressions:1.dangerous/no one knows yet/quite safe/as safe as natural food2.causes weight gain or loss/healthy/no side effect 3.just the same/more tasty/less tasty4.cheaper/more expensive/same as normal food5.need strict control/no need for control/same as natural food/should be bannedWrite a formal letter about GM food.Homework:
