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新外研社版高中英语选择性必修一
Unit5 Revealing nature
Using Language教学设计
教学目标：
By the end of this period, Students will be able to:
Correctly use the past perfect according to the context;
Learn some information about biodiversity and use them to express in different situations;
Enhance listening ability and understand the main idea of the listening material;
Share life experiences and give some advice or comments.
教学重难点：
Master the structures of the past perfect and correctly use them for expression.
Develop the listening ability and complete the tasks given in this lesson.
Learn some information about biodiversity and use personal experiences of life to illustrate the understanding of the biodiversity.
教学方法：
Task-based teaching method
教学资源：
教材、多媒体课件、学案、黑板和粉笔。
教学设计：
Step Ⅰ　Lead-in
Look at the sentences from the reading passage and answer the questions.
a Darwin suspected that the finches had evolved from a common ancestor,...
b Many people refused to believe that living things,including humans,had evolved from lower forms of life.
Questions:
1.In sentence (a),which action happened first,“suspected” or “evolved from a common ancestor”
2.In sentence (b),which action happened first,“refused to believe” or “evolved from lower forms of life”
3.What does the structure had done indicate
Suggested answers:
1.In sentence (a),“evolved from a common ancestor” happened first.
2.In sentence (b),“evolved from lower forms of life” happened first.
3.It indicates the action happened before a certain past action.
Step Ⅱ　Analysis and identification
Activity 1　Complete the paragraphs with the information from the given sentences
1.a Natural disasters led to food shortages in the 1960s.
b Yuan Longping began to do research on hybrid rice.
c Yuan Longping developed a better type of rice.
Yuan Longping (1)　　　　　　 to do research on hybrid rice because natural disasters (2)　　　　　　　　 food shortages in the 1960s.In the end,he (3)　　　　　 a better type of rice.
2.a Gregor Mendel chose to study pea plants because their characteristics were easy to control.
b Gregor Mendel made important discoveries about genetics.
c Gregor Mendel died in 1884.
Gregor Mendel (4)　　　　　　　　　 study pea plants because their characteristics were easy to control.By the time of his death in 1884,he (5)　　　　　　　　　 important discoveries about genetics.
Suggested answers:
1.(1)began　(2)had led to　(3)developed 2.(4)chose to　(5)had made
Activity 2　Complete the online encyclopaedia entry with the correct form of the words in the box
compete　decline　eat　live　introduce　arrive
Lonesome George
Lonesome George was the last Pinta Island tortoise.He died in 2012.After George’s death,the Pinta Island tortoise was declared extinct.
The extinction of the Pinta Island tortoise is blamed on humans.Before humans 1.　　　　　 on the island,the species 2.　　　　　　　　 in isolation and 3.　　　　　 the plants that naturally grew there.George was discovered many years after their arrival,and by then humans 4.　　　　　　 new species that 5.　　　　　　　 for the food the tortoises ate.After goats in particular had been brought to the island,the Pinta Island tortoise population 6.　　　　　　.Eventually,only George remained.
Suggested answers:
1.arrived　2.had lived　3.eaten　4.had introduced　5.competed　6.declined
Step Ⅲ　Listening
Activity 1　Listen to the podcast and choose the statements that are made
1.Biodiversity is important.
2.Bacteria are always harmful to humans.
3.Some species of bacteria are used in food production.
4.Many species of bacteria recycle dead organic matter.
5.Our immune systems are able to fight off all germs.
Suggested answers:3,4
Activity 2　Listen again and complete the fact sheet
Cells
Every living thing is 1._________________.
They are like 2.________________________.
In the human body there are about 3.　　　　　　　　　　　 human cells and around 4.　　　　　　　　 bacteria cells.
Bacteria
Most bacteria in the human body can 5.　　　　　　　　　　　　　.
In the food production process,bacteria can 6.　　　　　　　　　　　 dead organic matter.
Suggested answers:
1.made up of cells　2.bricks that are used to build houses 3.thirty trillion　4.thirty-nine trillion　5.help with digestion 6.break down
Activity 3　Complete the boxes with the expressions from the podcast
Do you know about...
By the way,...
Actually,...
Have you heard of...
In fact,...
Speaking of which,...
Checking background knowledge
Adding information
Suggested answers:
Checking background knowledge
Do you know about...
Have you heard of...
Adding information
By the way,...
Actually,...
In fact,...
Speaking of which,...
Step Ⅳ　Biodiversity
Activity 1　Read the passage and answer the questions
Earth is home to millions of different species.Some can be very small,like bacteria and viruses,which are so small that we cannot see them with only our eyes.By contrast,the largest animal species so far found on our planet is the blue whale,which can grow up to almost 30 metres in length and weigh over 130,000 kilos.The toughest species is probably the water bear.This tiny organism can survive temperatures from 150℃ to a below freezing -272℃.To best survive in their environment,each species has developed its own unique physical characteristics.
Each year,scientists identify around 15,000 new species.However,diversity on our planet is such,that there are still millions of species on Earth remaining to be discovered.
Questions:
1.What species are mentioned and what is special about them
2.What other unusual life forms do you know of
Suggested answers:
1.Two species are mentioned:the blue whale and the water bear.The blue whale is the largest animal species on Earth,which can grow up to almost 30 metres in length and weigh over 130,000 kilos.The water bear is probably the toughest species,which can survive temperatures from 150℃ to a below freezing -272℃.
2.Students’ own answers.
Activity 2　Complete the paragraphs with the correct form of the words and expressions in the box
ancestor　scientific　be native to　primitive　habitat　appearance　be home to　ecosystem
The Gal’pagos Islands are renowned worldwide for their unique biodiversity.The Giant Tortoise Reserve on Santa Cruz 1.　　　　　　　　　　　 several species of giant tortoise that 2.　　　　　　　　　　　 the Gal’pagos Islands.The island is also home to the Charles Darwin Research Station,where 3.　　　　　 studies are carried out.
Mangroves are one of the coastal plants that grow on Isabela.They serve as the 4.　　　　　　 for various birds and fish,and are very important to the 5.　　　　　　　.
Iguanas can be found on San Cristóbal.They have a very special 6.　　　　　　　,with comb-like spines on their back.There is evidence that all the different iguanas have developed from more 7.　　　　　　　 ones and share a common 8.　　　　　　.
Suggested answers:
1.is home to　2.are native to　3.scientific　4.habitats　5.ecosystem　6.appearance　7.primitive　8.ancestor
Step Ⅴ　Discussion
Work in pairs.Look at the pictures of the species native to different regions of China in the textbook.Talk about biodiversity in China using the words and expressions in this section.Do online research to find more information.
Now talk about what methods you used to collect the information pare your methods with your partner’s and think about which methods are more efficient.
Step Ⅵ　Homework
一、语法专练。
1.His newly written novel 　　　　　　　　　　　(translate) into English by the end of last month.
2.I 　　　　　　　　　(plan) to take a French course last summer,but I changed the plan later.
3.It is the first time that we 　　　　　　　　　(talk) about this issue face to face.
4.It was the tenth time that the Chinese women’s volleyball team 　　　　　　　　　(claim) the world championship.
5.She found that the house in the area 　　　　　　　　　　　　　(destroy) by the storm.
6.They 　　　　　　　　　(plant) six hundred trees before last Wednesday.
7.The band 　　　　　　　(go) on tour to promote their new album.
8.It 　　　　　　　　　　(rain) heavily in the last few days and mountain torrents may become a danger at any moment.We must be prepared.
9.Silk 　　　　　　　　　(become) one of the primary goods traded along the Silk Road by about 100 BC.
二、翻译句子。
1.Natural disasters led to food shortages in the 1960s.
2.Yuan Longping began to do research on hybrid rice.
3.Earth is home to millions of different species.
Suggested answers:
一、1.had been translated　2.had planned　3.have talked　4.had claimed　5.had been destroyed　6.had planted　7.has gone　8.has been raining　9.had become
二、1.20世纪60年代,自然灾害造成粮食短缺。
2.袁隆平开始研究杂交水稻。
3.地球是数百万不同物种的栖息地。
评价量规
评价项目 自我评价 教师评价
能够正确运用过去完成时 □Excellent □Good □In need of improvement □Excellent □Good □In need of improvement
能够运用过去完成时介绍一种生物 □Excellent □Good □In need of improvement □Excellent □Good □In need of improvement
能够通过听力活动,正确获取主旨大意和详细信息 □Excellent □Good □In need of improvement □Excellent □Good □In need of improvement
能够通过听力学习活动,深刻理解“自然界生物的多样性” □Excellent □Good □In need of improvement □Excellent □Good □In need of improvement
能够理解同伴的观点并给予恰当的评论 □Excellent □Good □In need of improvement □Excellent □Good □In need of improvement
教学反思：
本节课帮助学生总结归纳“动词的时态和语态之过去完成时”的用法，并通过对袁隆平、孟德尔实验以及对龟的介绍，巩固语法及词汇知识。此外，通过听说材料介绍细胞、细菌及地球上的一些独特物种，如：蓝鲸、水熊、Galápagos 岛的大龟、Isabela岛上的红树林、San Cristóbal岛上的美洲蜥蜴以及中国境内的东北虎、水杉、牦牛、胡杨树、孔雀等，帮助学生进一步了解自然界中生物的多样性，激发学生了解神奇自然，走进自然的兴趣。

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