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111 The Third Period The General Idea of This Period In this period we’re going to learn another reading passage. Teaching Aims 1　.Learn and master the following words and expressions: rust　boil ordinary　steam　float　form　dissolve　add to　keep out of 2.　Learn to describe a simple scientific experiment. Teaching Difficult Points 1.　Enable the Ss to write a report on a scientific experiment. 2.　Learn to use the new words and expressions in this part. Teaching Methods  Reading,　question and answer. Teaching Aids 1.　a tape recorder 2.　a computer 3.　some test tubes,　nails,　Bunsen burner,　balance,　tongs Teaching Procedures Step 1 Greetings 　 Greet the whole class as usual. Step 2 Revision 　 Show the metals learned in the last period to the class and ask them to name them in English. Step 3 Presentation 　 Read the passage to find the answers to the questions. 1.　What’s the aim of the experiment? 2.　What equipment do we need in order to do the experiment? 3.　How long does it take to see whether iron rusts in the three cases? 4.　How can we take the air out of water? 5.　How can oil prevent air entering water? (Show the questions above on the screen.) Step 4 Reading 　 Read the passage individually and then discuss in pairs or groups.　It’s a good time to learn the new words and understand the meaning of the passage. Step 5 Call back the answers from the Ss 　 1.　It is to find if iron rusts in dry air,　in air－free water or in ordinary water. 2.　We need some test tubes,　test tube holder,　cotton wool,　oil and Bunsen burner. 3.　A week. 4.　We can take air out of water by boiling it. 5.　 Because oil is lighter than water,　it stays on the surface of water. Step 6 Learn the new words 　 1.　Ask the Ss to pick out the new words in Passage B. Write the words on the blackboard.  rust,　test tubes,　nails,　Bunsen burner,　boil,　ordinary　　　　　　　　　　　　　　 2.　Read the new words after you twice. Bring out the apparatus on the desk. Step 7 Careful reading 　 T:　Well.　Now reread the passage carefully to further understand it. Then work in pairs to fill in the blanks on Page 45.  Step 8 Language points 　 1.　Add some oil to the water.  在水中加點油。 add sth. to sth. else  Add some sugar to the soup.  在湯里加點鹽。 He planned to add a room to his house.  他打算再擴建一間屋子。 Five added to ten makes fifteen.  五加十等于十五。 2.　This will keep air out of the water.  這會使空氣不進入水中。 keep...out of... 把……擋在外面;不讓……靠近 The dog is smelly. Keep it out of the room.  這狗身上很難聞，把它弄到屋子外面去。 Keep out of the railroad track. 請勿靠近鐵軌。 3.　Iron rusts in ordinary water. 鐵在普通的水里會生銹。 ordinary 一般的;普通的;平常的 in ordinary dress 穿著便服 ordinary work 平常的工作 Step 9 Practice 　 Complete the sentences on P46,　Part 5. Keys:1.nail　2.does not rust　3.boil;air　4.oil;air　5.iron; air Step 10 Assignment 　 1.　Do the experiment in groups of three after class. 2.　Report a similar experiment you have just done in the lab. Step 11 The design of the writing on the blackboard 　 Module 5　A Lesson in a Lab The Third Period 1.　What’s the aim of the experiment? 2.　What equipment do we need in order to do the experiment? 3.　How long does it take to see whether iron rusts in the three cases? 4.　How can we take the air out of water? 5.　How can oil prevent air entering water? rust,　test tubes,　nails,　Bunsen burner,　boil,　ordinary 　 add sth. to sth. else 　 keep...out of... 　 ordinary Step 12 Activity and Inquiry Steps Students’ Acting Teacher’s Organizing 1 Complete the description involved in some careful reading for specific information (scanning) and reorganize the information. Remind the students how they usually write up scientific experiments. 2 Complete the description on their own,　and then check their answers in pairs. Ask the students to complete the description on their own. 3 Give the answers. Play the recording again. 111