選修九 4.3Unit 4　Key to exercises in the workbook (III)

1、新課標(biāo)人教版課件系列 高中英語(yǔ) 選修選修( (模塊）模塊）9- 9-4.3 experiment reports look at the pictures in exercise 1 and guess the answers to the questions: what materials are being used in this experiment? what do you think the purpose of the experiment is? what order do you think the pictures should go in? listening on p7

2、9 number the pictures in the order you hear about them. 2 3 15 4 listen to the first part again and answer the questions. 1. what is the purpose of the experiment? to find out three important conditions that seeds need in order to start growing. 2. are students going to do the experiment in groups o

3、r individually? in groups. 3. where are the materials that the students need to set up the experiment? on the bench. 4. what materials do the students need to set up the experiment? four dishes and four pieces of cloth, a dish of seeds, some tap water, some boiled water and some cooking oil. third l

4、istening listen to the first part again and complete the table of conditions that each dish of seeds was given. conditions dish a dish b dish c dish d tap water, warm temperature, oxygen tap water, cold temperature, oxygen no water, warm temperature, oxygen boiled water, oil, warm temperature, no ox

5、ygen fourth listening now listen to the second part of the tape in which the class discusses the results of the experiment. complete the table of results. did the seeds grow? reasons why or why not dish a dish b yes because they had water, warmth and oxygen. no because it was too cold. did the seeds

6、 grow? reasons why or why not dish c dish d no no because they were watered with boiled water which has no oxygen. also, they were covered with oil which prevented oxygen getting to the seeds. because they didnt get any water. listen to the second part of the tape again and discuss the question: wha

7、t was the conclusion of the experiment? seeds need warmth, water and oxygen to grow. an experiment on plants part1: listen to a teacher(th) helping her class set up an experiment. th: ok, everybody, this morning were going to do an experiment to find out three important conditions that seeds need in

8、 order to start growing. listening text the materials are all on the bench. choose someone from your group to go and get four dishes and four pieces of cloth, a dish of seeds, some tap water, some boiled water and some cooking oil. look at the instructions on the board. lets read through them. one:

9、put the pieces of cloth on the dishes and spread the seeds on the cloth. label the dishes a to d. two: take dish a and wet the cloth with tap water and place it in a well-aired warm spot so by the window over there would be fine. three: take dish b, wet it with tap water and put it in the fridge. fo

10、ur: take dish c and put it next to dish a. do not water it. five: take dish d and water it with the boiled water. then drop a small amount of oil onto the cloth and put it next to dish c. six: leave them all for a few days. ok, now you can go ahead and set up the experiment. part 2: listen to the cl

11、ass discussing the results of the experiment. students include andrew (a), rosemary (r) and sandy(s). th: right, lets talk about whats happened in our experiment. what are the results? andrew? a: the seeds in dish a have started growing but none of the others have. th: good. why do you think the see

12、ds in dish b didnt grow? rosemary? r: because it was too cold? th: thats right. and what about dish c? r: the seeds didnt get any water so they couldnt grow. th: yes. now, dish d is interesting. the seeds got both water and warmth so why didnt they grow? any ideas? andrew? a: well, the seeds got boi

13、led water. th: so, whys that important? anyone? well, boiled water has no oxygen in it and seeds need oxygen to grow. and what about the oil? sandy? s: wouldnt the oil make sure that no oxygen could get to the seeds? th: excellent. well done. so, whats our conclusion about three important conditions

14、 that a seed needs in order to start growing? s: that seeds need warmth, water and oxygen to grow. th: very good. now i want you all to write up the experiment in your science notebook. writing task when writing an experiment report, you can ask questions about: the position of the headings, what th

15、e headings are, their order: how the items in the “materials” section are presented (as a list); what the “procedure” tells you (the steps you carry out to set up the experiment); the grammatical structures used for each section of the report. outline materials: abcd aim: to find out three important

16、 conditions that seeds need in order to start growing. 1. four dishes 2. four pieces of cloth 4. some tap water 3. some boiled water 5. a dish of seeds 6. some cooking oil procedure: 1.put the pieces of cloth on the dishes. spread the seeds on the cloth. label the dishes a to d. 2. take dish a and w

17、et the cloth with tap water and place it in a well-aired warm spotso by the window over there would be fine. 3. take dish b, wet it with tap water and put it in the fridge. 4. take dish c and put it next to dish a. do not water it. 5. take dish d and water it with the boiled water. then drop a small

18、 amount of oil onto the seeds and put it next to dish c. 6. leave them all for a few days. results dish a: dish b: dish c: dish d: conclusion seeds need warmth, water and oxygen to grow. the seeds grew. the seeds didnt grow. the seeds didnt grow. the seeds didnt grow. sample report: i did the experi

19、ment to find out three important conditions that seeds need in order to start growing. first, i put the four pieces of cloth on each dish, spread the seeds on the cloth and label the dishes a to d. then i placed dish a in a well-aired warm spot by the window, took dish b and wet it with tap water an

20、d put it in the fridge, took dish c and put it next to dish a without watering it. finally i watered dish d with the boiled water, dropped a small amount of cooking oil onto the seeds and put it next to dish c. a few days later, i found that only dish a grew. so i drew a conclusion that seeds need w

21、armth, water and oxygen to grow. discussion: look at the pictures of a plant experiment. the pictures are in the correct order. discuss with partners about the processes the plants go through. report each picture one by one: plant three beans in a pot, water them and leave them in a warm, light spot. two small shoots appear. cut the ends off a plastic bottle. wrap the bottle in dark paper. lay the bottle on its side in the pot and put some wet pa