2022年高中英语（人教大纲）第三册：Unit2 Crossing limits(第二课时)Teaching Aims:1.Learn and master the useful words and phrases in this period.2.Train the students reading ability.3.Learn about exploring the south of the Nile.Teaching Important Points:1.Master the following:Phrases:in exchange for,take.prisoner,reach out,set sail to/from/for.,in return2.Enable the students to understand the text better.3.Improve the students reading ability.Teaching Difficult Points:1.How to help the students understand the reading passage better.2.How to improve the students reading ability.Teaching Methods:1.Scanning the text to get the general idea of it.2.Carefully reading to plete a chart and answer some detailed questions.3.Discussion after reading to make the students understand the text better.4.Individual,pair or group work to make every student active in class.Teaching Aids:1.the multimedia2.a tape recorder3.the blackboardTeaching Procedures:Step GreetingsGreet the whole class as usual.Step Revision and Lead-inT:Yesterday we talked a lot about exploring the world.Have you remembered what kinds of exploration we referred to?Ss:Yes.Space exploration,voyage exploration,desert exploration,polar exploration.T:Well done,weve learned a famous road called “Silk Road” in history class.Could you say something about it?S1:I know it.The “Silk Road” began from Changan,the city of Xian now,along the Gansu Corridor,then to West Asia and Europe.T:OK.Through the “Silk Road”,China got in touch with some other countries over land.Today were going to learn a passage about exploring to Africa.It will tell us the contacts between China and Africa centuries ago.Before reading the passage,lets learn some new words and phrases in the period.(Teacher deals with the new words and phrases with the whole class,and gives some explanations if necessary.)Step Pre-readingT:Now,open your books and turn to Page 12.Scan the passage and find out the answers to the last two questions in Pre-reading.Three minutes later,Ill ask some students to answer them,clear?Ss:Yes.T:(After three minutes.)Have you finished?Ss:Yes.T:OK.Who wants to have a try to answer the second question?S2:Maybe because people had great curiosity about the distant Asia.T:Good job.Anything else?S3:I think Marco Polos stories,Columbus and other European explorers influenced people.They all thought Asian lands were very wealthy.T:Maybe youre right.Thank you,what do you know about Gan Ying?S4:He was a Chinese ambassador who went to the East Roman Empire over land in 97 A.D. and returned to Luoyang with a present from an African kingrhinoceros horns.T:Terrific!What do you know about Zheng He?S5:Let me have a try.In the years between 1405 and 1433,Zheng He set sail from the South China Sea across the Indian Ocean to the mouth of the Red Sea,and then travelled further south,discovering the eastern coast of Africa.S6:He renewed relations with the kingdoms of the East African coast.S7:The African king and rulers and Zheng He sent to each other various wonderful presents.The exchange of goods had a symbolic meaning far more important than the value of the goods themselves.T:You all did a good job!Thank you!Step ReadingT:OK,now read the passage as carefully as you can.I will give you two charts to fill in.Theyre Ex.3 and 4.Do you understand?Ss:Yes.T:(A few minutes later.)Are you ready?Ss:Yes.T:Lets check the answers together.Suggested answers: 3.PeriodNameWay of travelGoodsIn 97 A.D.Gan Yingover landrhinoceros hornsIn 751-762Du Huanon land and by boatIn the 11th centurythe Africansby seabronze statue of a lionIn1405-1433Zheng Heby seagiraffes,zebras,shells,elephant ivory,rhinoceros-horn medicine,gold,spices,silk,etc.4.AfricaAfrica and AsiaGoodsgiraffes,ze-bras,shells,rhinoceros-hornmedicinerhinoceros horns,ele-phant ivory,shells,animal skinsT:Well,youve understood the text better.In order to understand it more exactly and use the language freely and correctly,please learn the following on the screen.(Teacher shows the following on the screen.)1.in exchange for(=receive one thing in place of another)e.g.He is teaching her how to play chess in exchange for her love.The child gave the old man five apples in exchange for five eggs.2.reach out(=stretch out)e.g.He reached out for the dictionary.3.take.prisoner(keep sb. in prison)e.g.He was taken prisoner for a serious crime in xx.4.set sail to/fro/for. (=begin a voyage)e.g.He decided to set sail to/for New York the next day.5.in return (=as payment for.)e.g.Tom paid little attention to lessons,and in return he failed all the exams. (Bb:in exchange for,reach out,take.prisoner,set sail to/from/for.,in return)Step Listening and ReadingT:Now Ill play the tape.You can f