第一篇：高中英語 Spring Festival教學素材 新人教版必修3

浙江省杭州市塘棲中學高中英語 Spring Festival教學素材 新人教

版必修3 The New Moon on the first day of the new year--the full moon 15 days later Chinese New Year starts with the New Moon（新月）on the first day of the new year and ends on the full moon（滿月）15 days later.The 15th day of the new year is called the Lantern Festival（元宵節）, which is celebrated at night with lantern displays and children carrying lanterns in a parade.The Chinese calendar is based on a combination of lunar and solar movements.The lunar cycle（月運周期）is about 29.5 days.In order to catch up with the solar calendar the Chinese insert an extra month once every few years(seven years out of a 19-yearcycle).This is the same as adding an extra day on leap year（閏年）.This is why, according to the solar calendar, the Chinese New Year falls on a different date each year.New Year's Eve and New Year's Day are celebrated as a family affair, a time of reunion and thanksgiving.The celebration was traditionally highlighted with a religious ceremony given in honor of Heaven and Earth（萬物）, the gods of the household and the family ancestors.The sacrifice to the ancestors, the most vital of all the rituals（儀式）, united the living members with those who had passed away.Departed relatives are remembered with great respect because they were responsible for laying the foundations for the fortune and glory of the family.The presence of the ancestors is acknowledged on New Year's Eve with a dinner arranged for them at the family banquet table.The spirits of the ancestors, together with the living, celebrate the onset of the New Year as one great community.The communal feast called surrounding the stove or weilu.It symbolizes family unity and honors the past and present generations.The Origin of Chinese New Year The Chinese New Year is now popularly known as the Spring Festival because it starts from the Begining of Spring(the first of the twenty-four terms in coodination with the changes of Nature).Its origin is too old to be traced.Several explanations are hanging around.All agree, however, that the word Nian, which in modern Chinese solely means year, was originally the name of a monster beast that started to prey on people the night before the beginning of a new year.One legend goes that the beast Nian had a very big mouth that would swallow a great many people with one bite.People were very scared.One day, an old man came to their rescue, offering to subdue Nian.To Nian he said, I hear say that you are very capable, but can you swallow the other beasts of prey on earth instead of people who are by no means of your worthy opponents? So, it did swallow many of the beasts of prey on earth that also harrassed people and their domestic animals from time to time.After that, the old man disappeared riding the beast Nian.He turned out to be an immortal god.Now that Nian is gone and other beasts of prey are also scared into forests, people begin to enjoy their peaceful life.Before the old man left, he had told people to put up red paper decorations on their windows and doors at each year's end to scare away Nian in case it sneaked back again, because red is the color the beast feared the most.From then on, the tradition of observing the conquest of Nian is carried on from generation to generation.The term Guo Nian, which may mean Survive the Nian becomes today Celebrate the(New)Year as the word guo in Chinese having both the meaning of pass-over and observe.The custom of putting up red paper and firing fire-crackers to scare away Nian should it have a chance

第二篇：高中英語：Unit 5 Canada—The True North Reading(新人教必修3)

高一英語同步練習：

Unit 5 Canada—The True North

第2課時Reading 基礎練習

1.閱讀課文，判斷以下句子的描述是否與文章相符。（用Ｔ／Ｆ來表示）1.They went to see their cousins in Vancouver.2.You can cross Canada in less than 5 days by train.3.The girls looked out oｆthe windows and saw Native Indians and cowboys.4.They traveled in Canada from east to west.5.Canada is the biggest country in the world.6.Canada has one-third of the world’s fresh water.實戰演練

一.根據課文內容用適當的詞或詞組填空：

Li Daiyu and Liu Qian took the train in Canada from ___ to____.Their cousins’ friend, Danny Lin, took them to the train station to catch“_________”.Canada is the _____ biggest country in the world.It is 5,500 kilometres from ____ to____.As they go ____, they saw beautiful scenery as well as cities.Vancouver is _______ by mountains on the north and east.When the cousins _________in the seats, they looked out of the window.They saw ___________ and even a bear.Calgary is famous for its competition.Many of the cowboys from all over North America _________working with animals.Then they______ a wheat-growing province.Thunder Bay is a busy port.It is _____ the center of the country.That night they slept as the train rushed towards _______.二.單項選擇

1._____ of the village ______two small lakes.A.The east；lie

B.East；lies D.East；lie C.The east；lies

2.Seeing the happy ____ of children playing together there, I am full of joy.A.view B.sight C.sign D.scene 1 3.The total cost of their trip to Canada ________$5 000.A.added up to

B.added up C.added to

D.was added up to 4.The question came up at the meeting _____we had enough money for our research.A.that B.what C.which D.whether 5.The young man went _____the woods，swam_____ the river and came to a small village.A.in；across

B.through；across

D.into；through C.through；over

6.Finally, he ___to get out of trouble with no one helping him.A.offered

B.attempted

C.managed D.succeeded 7.John plays football______________, if not better than, David.A.as well

B.as well as

C.so well

D.so well as 8.Word came _______ the students would put off the outing until next week, when they wouldn’t be busy.

A.that B.when

C.which

D.whether 9.The _____ look _____ her face suggested that she was scared.

A.amazed;in

B.amazed;on

C.amazing;in

D.amazing;in 10.The child had only a ___ temperature, but the doctor thought the illness was serious enough for hospital treatment.A.slightly

B.lightly

C.slight

D.narrow 11.–We have wasted a lot of time ___here.Now we ought to come to the point.--OK.Let’s begin.A.chatted

B.chatting

C.having chatted

D.to chat 12.Peter received a letter just now ____ his friend would come to China.A.saying

B.said C.says D.to say 13.That river ___250 kilometres long and 60 metres wide.A.measures

B.measure

C.measured

D.measuring 14.Catching ___sight of policemen coming, the thief swiftly went out of ___sight

A.the;the

B.the;/

C./;the

D./;/ 15.The wild flowers looked like an orange blanket ___ the desert.A.covering

B.covered C.cover

D.to cover

三.根據漢語意思完成句子

1.The house ________________.警察包圍了這幢房子。2._______________ on the tree.樹上只剩下幾片葉子了。3.He ____________ music.他有音樂天賦。

4.He preferred_______________ rather than __________.他寧愿坐在家里看電視也不愿去聽音樂會。

5.______ the population of China in 2000?中國在2000年的人口是多少？

6.___________, many foreigners ______ in China.隨著中國經濟的發展，許多外國人定居中國。

反饋檢測

閱讀短文并選出最佳答案。

A OTTAWA — Canada’s western city of Calgary is the world’s best city when it comes to healthy living, local press reported Monday.According to an international survey by Mercer Human Resource Consulting, a London-based consulting firm, Calgary was put at the top of a list of 144 cities.It scored 121 points, just above Honolulu’s score of 120.Helsinki（赫爾辛基，芬蘭首都）and Ottawa followed at 119.5 and 118.5 respectively.Three other Canadian cities came in the top 20.Montreal and Vancouver tied for ninth and Toronto came in at 18th.The scores are based on air pollution levels, availability and quality of hospitals and medical supplies, as well as the efficiency of waste removal and sewage systems.3

In America, the lowest scoring city was Atlanta, which was ranked 76th.Athens was the lowest scoring city in Western Europe, ranking 120th because of its air pollution.London was ranked 59th.1.How many Canadian cities are in the top 20? A.3.B.4.C.5.D.6.2.Which of the following is NOT taken into account when the cities were scored? A.Weather conditions.B.Air quality.C.Waste removal.D.Medical supplies.3.Among the following cities, which is the lowest scoring one? A.Atlanta.B.Athens.C.London.D.Helsinki.B Canada is one of the few nations in the world that have two official languages：English and French.There are 10 provinces in the country but only one of these—Quebec is known as “French Canada”.This is because it was founded by French explorers while British adventurers discovered the rest.Canada left the British empire in 1867 to become an independent country，and English and French have become the official languages ever since.Most people speak English as their first language and the two national television networks broadcast in English throughout the country.Apart from in Quebec and a few places on the east coast，French television is very rare.The same goes for traffic signs and menus，for example，outside of Quebec，there are only a few places where you’ll see traffic signs in French.In restaurants，it’s almost impossible to find French on the menu unless you are in the heartland of French Canada.However，it is claimed by law thay all products sold in Canada must have labels and instructions in both languages.In Canada’s English speaking provinces，official bilingualism(雙語)means that students can choose to complete a special French language course.Under this programme，they are taught most of their subjects in French.If a student begins the course in kindergarten or Grade One，it is likely that all their lessons will be in French.However，if they start at junior high school，25 percent of the teaching will continue to be in English.4.How many provinces are there in Canada? A.Ten.B.Nine.C.Eleven.D.Two.5.Which country controlled Canada before its independence? A.France.B.Britain.C.America.D.Germany.6.Where can you watch French television programmes? A.Only in Quebec.B.In Quebec and a few other places.C.From the two national television networks.D.All over Canada.7.What about the education in Canada? A.In English speaking provinces only English courses are offered there.B.If you choose a special French language course，most of the subjects are taught in French.C.The courses in primary school are all taught in English.D.Most of the courses in junior high schools are taught in English.8.Which of the following sentences is right? A.English is the only official language，though French is also spoken there.B.The two national television networks broadcast both in English and French.C.All products sold in Canada must，by law，have labels and instructions in both English and French.D.The lessons in kindergarten or Grade One are likely to be only in English.第2課時reading 5 基礎練習

閱讀課文判斷以下句子描述是否與文章相符 1.F 2.F 3.F 4.F 5.F 6.T 實戰演練：

一根據課文內容填空

west, east, The True North, second, coast, coast, eastward, surrounded, settled down, mountain goats, have a gift for, went through, close to, Toronto.二單選1.D 2.D3.A 4.D 5.B 6.C 7.B 8.A 9.B 10.C11.B 12.A 13.A 14.D 15.A 三翻譯句子

1.was surrounded by the police.2.Only a few leaves remained.3.has a gift for

4.to stay at home watching TV, go to the concert.5.What is

6.With the development of Chinese economy, have settled 反饋檢測： 閱讀理解

1C 2.A 3.B 4.A 5.B 6.B 7.B 8.C

第三篇：高中英語必修3教學工作計劃

2011—2012學第一學期

教學工作計劃

本學期本人任高二(5)、(6)班的英語教學工作。在本學

期的高二英語教學工作中，要以學校工作計劃為指導思想，以培養學生自主學習和自主管理能力為主線，全面貫徹落實新課程改革的精神，針對我校高一新生普遍英語底子差，基礎薄的實際，堅持“夯實基礎，狠抓雙基，改進學法，激發興趣，提高能力”，特制定本期教學工作計劃。

一、教學理念

1、要面向全體學生，關注每個學生的情感，激發他們

學習英語的興趣，幫助他們建立學習的成就感和自信心，使他們在學習過程中發展綜合語言運用能力，提高人文素養，增強實踐能力，培養創新精神;

2、突出學生主體，尊重個體差異，讓學生在老師的指

導下構建知識，提高技能，磨練意志，活躍思維，展現個性，發展心智和拓展視野;

3、讓學生在使用英語中學習英語，讓學生成為Good

User而不僅僅是Learner。讓英語成為學生學習生活中最實用的工具而非累贅，讓他們在使用和學習英語的過程中，體味到輕松和成功的快樂。高二英語既注重基礎知識的考查，又強調能力的靈活運用。為了適應這一趨勢，提高高二英語的教學質量，在高二英語教學中我將常抓基礎知識，有梯度 1

地拓寬詞匯，提高課堂效率，從而努力提高學生學習的自覺性、主動性與積極性，通過師生互動，更進一步提高英語成績。

二、學生分析

從學生高一期末考試情況來看，這兩個班學生存在以下三方面問題：在思想上、態度上放松或放棄的現象有所表露，讀,不會讀，就談不上聽得懂,看得懂,從而導致破罐子破摔的現象。基礎知識不夠扎實，靈活運用語言的技能相對薄弱。運用能力不夠強實。學生的閱讀能力、理解能力、分析能力、判斷能力、應變能力等均不能較好地適應考查要求。語言學習的關鍵在于語言知識的積累，只有通過學習者親身的體驗和摸索，才能學會并掌握語言知識，從而達到在交際中靈活使用語言的目的。

三、教材分析

該冊教材從不同方面具有如下特點：

1、內容豐富，涉及面廣。本冊教材的課文篇幅長、題材廣，內容豐富，不但是一個綜合知識的大熔爐，而且時代氣息逼人，很具有挑戰性。學生不但可以學到真實的英語語言，而且可以學到廣泛的綜合知識，訓練全面的英語語言技能。說句實在話這套新教材對我們英語任課教師無論從語言知識而是語言技能上都展開了挑戰。

2、詞匯量大，語言地道。由于所選文章涉及的領域多，又是原汁原味，因此，各方面的詞匯都出現了。又由于沿用地道的原文，不同作者用詞不同，出現了大量的近義詞。雖然這給學生提供了學習英語的真實語言環境，但也增加了學生學習英語的難度。

3、精心編排，形式新穎。教材編排的匠心不但體現在課文內容的精心選編和課型的優化設計。特別突出的是教材的各種練習形式新穎別致，不但注重知識性，而且充分注入了趣味性。也充分發揮了現代教育技術在英語學習中的先進作用。

4、理念先進，實踐標準。該冊教材把綜合語言運用能力的形成建立在語言技能、語言知識、情感態度、學習策略和文化意識等素養整合發展的基礎上。也把語言技能的形成作為語言學習的必須手段。完全實踐了《普通高中英語課程標準》的新理念。

四、本學期的教學目標及措施

高二年級是高中的重要階段，又是高中三年的承上啟下階段。因此，讓學生在高二年級打好學科基礎并有所發展是極其重要的。下列目標應在本學期內達到：鞏固、擴大基礎知識;培養口頭和書面初步運用英語進行交際的能力，側重培養閱讀能力;發展智力，培養自學能力。爭取在原有基礎上有所提高，縮小與上學期期末考試時平均分排在我們前面的幾個理科班的差距。根據教學步驟完成模塊5及模塊6的教學內容，根據學生的實際情況對教材練習適當做出調整，刪減。讓復雜問題簡單化，使學生更容易掌握所學知識。加大學生的閱讀量。提高閱讀速度。

此外，在本學期高二英語教學計劃中，要狠抓基礎及單詞、句型及語法等，扎實基礎知識，突擊寫作訓練，為高考打下扎實的基礎。具體方法如下：

1、鉆研并創造性地利用教材，靈活使用，發揮教材特點。

2、內容要求學生一定要過詞匯關，反復朗讀、默寫單詞、以便加強學生對基礎知識的掌握。摒棄不切實際的教學步驟，抓重點，搞強化，在日常教學中滲透語法意識。利用教材提高學生的基本功，堅持默寫單詞及重點句型。

3、本學期仍要堅持訓練學生的聽力和并開展任務型寫作教學。扎實寫作常用句型的同時，要求向句群篇章背誦過渡，培養良好的學習習慣和寫作基礎。

4、培養學生的閱讀能力，并以這些材料為基礎，擴充學生詞匯量，做到每學完一篇課文，就進行詞匯檢測。拓寬教材，擴展學生閱讀量，努力補充學生的詞匯。在平時教學過程中不斷擴大學生的詞匯量，詞匯教學以新帶舊，從而達到鞏固擴充詞匯的目的，做到經常督促、檢測。

5、加大基礎寫作訓練的力度，大力鼓勵學生學以致用。并要求學生背范文、教師精選的課文段落、寫作必背句型，使學生熟悉英語的句式結構及習慣用法，從句到篇，從而寫出完整的英語文章。另外每周進行一篇的寫作訓練，鼓勵運用背過的句型，提高學生的寫作能力。

6、綜合檢查。準備每一單元做一次練習，主要以結合當前教學內容為主要測試內容, 間或分塊測試，習題的訓練在于精而不在于多。在教學中盡量按照高考的知識體系有針對性地選擇典型性題目。針對共性問題進行精講，讓學生在書本中找到解決問題的源泉，學會思考、整理和歸納。

綜上所述，高二年級的教學工作是非常關鍵的，我會盡職盡責完成本職工作，再接再勵，取得更好的成績。、

第四篇：高中英語 Carnival教學素材 新人教版必修3

浙江省杭州市塘棲中學高中英語 Carnival教學素材 新人教版必修3 Carnival is a festive season which occurs immediately before Lent;the main events are usually during February and March.Carnival typically involves a public celebration or parade combining some elements of a circus and public street party.People often dress up or masquerade during the celebrations.Carnival is mostly associated with Roman Catholic and, to a lesser extent, Eastern Orthodox Christians;Protestant areas usually do not have carnival celebrations or have modified traditions, like the Danish Carnival.The world's longest carnival celebration is held in Brazil but many countries worldwide have large, popular celebrations, such as Carnaval of Venice, or the world famous Trinidad and Tobago Carnival.An inspiration for the carnival lies in the fact that during Lent, traditionally no parties may be held and many foods, such as meat, are forbidden;the forty days of Lent serve to commemorate the Passion of Jesus.It is natural for people to have the desire to hold a large celebration at the last possible opportunity before fasting.Parts of the carnival traditions, however, likely reach back to pre-Christian times.The ancient Roman festivals of the Saturnalia and Bacchanalia is a probable origin of the Italian Carnival.The Saturnalia, in turn, may be based on the Greek Dionysia and Oriental festivals.While medieval pageants and festivals such as Corpus Christi were church sanctioned celebrations, carnival was a representation of medieval folk culture.Many local carnival customs are also based on local pre-Christian rituals, for example the elaborate rites involving masked figures in the Swabian-Alemannic carnival.In Christianity, the most famous traditions, including parades and masquerading, are first attested from medieval Italy.The carnival of Venice was for a long time the most famous carnival.From Italy, carnival traditions spread to Spain, Portugal, and France.From France, they spread to the Rhineland of Germany, and to New Orleans.From Spain and Portugal, they spread to Latin America.Many other areas have developed their own traditions.

第五篇：高中數學《條件語句》文字素材4 新人教B版必修3

必修3“條件語句”的教學實踐與反思

一、教材分析

1、教學內容的地位和作用

算法是設計高中數學課程的一條主線，程序是由若干算法語句組成的有序集合。“算法語句”是繼“程序框圖”之后學習的內容，是解決某一個（或某一類）問題的算法的程序實現。在此之前，學生已學習了算法的概念、程序框圖與算法的基本邏輯結構、輸入語句、輸出語句和賦值語句,這為過渡到本節的學習起著鋪墊作用。對于順序結構的算法或程序框圖，我們可以利用輸入語句、輸出語句和賦值語句，寫出其計算機程序，對于條件結構的算法或程序框圖，要轉化為計算機能夠理解的算法語句，我們必須進一步學習條件語句。條件語句與程序框圖中的條件結構相對應，它是五種基本算法語句中的一種,通過本節課的學習，學生將更加了解算法語句，并能用更全面的眼光看待前面學過的語句，并為以后的學習作好必要的準備。本節課對學生算法語言能力、有條理的思考與清晰地表達的能力，邏輯思維能力的綜合提升具有重要作用。

學習算法的目的，不是學習程序設計語言，而是體會算法的基本思想以及算法的重要性和有效性，算法學習能夠幫助學生清晰思考問題，提高邏輯思維能力；有助于學生全面的理解運算；有助于提高學生的信息素養。《新課標》要求學生“經歷將具體問題的程序框圖轉化為程序語句的過程，理解幾種基本算法語句----輸入語句、輸出語句、賦值語句、條件語句、循環語句，進一步體會算法的基本思想。

2、教學重點和難點

重點：條件語句的基本格式、種類以及應用，與條件結構的關系 難點：條件語句的應用，會編寫程序中的條件語句.二、目標分析

1、知識與技能

知識目標：理解基本算法語句---條件語句，以及與條件結構的關系，初步體驗如何由程序框圖轉化為程序語句。

條件語句的兩種形式如下：

IF 條件

THEN

IF 條件

THEN

語句體1

ELSE

語句體

語句體2

END IF

END IF

能力目標：通過條件語句的學習，了解條件語句在解決問題中的應用，進一步體會算法的基本思想。

2、過程與方法

采用“案例教學“，從具體的學生熟悉的實例出發，在具體的情境中，教師啟發引導、講練結合，螺旋上升的方式，實現教學目標。

3、情感、態度與價值觀

通過生活中的一些具體問題的解決，培養學生對設計算法的濃厚興趣，激發學生的求知欲，鍛煉學生解決問題的能力，進而增強學生的成就感。

三、教學過程

1、創設情境，提出問題

問題1：黃巖火車站快要開始營業了

規定：火車托運p(kg)行李時每千米的費用（單位：元）標準為

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專心 0.3pp?30kg? y???0.3?30?0.5(p?30)p?30kg請設計算法，并畫出行李托運費的程序框圖

[設計意圖]問題是數學的心臟，數學教學應當從問題開始，以實際應用問題作為情境，激發學生的學習熱情，引發學生的學習動機，通過問題展開教學活動，引導學生主動進入新知識。

2、解決問題

(1)探討條件結構的特點

以學生所畫的程序框圖為例，概括條件結構的特點，并與順序結構進行比較，得出如下結論：條件結構的特點是有一個判斷過程，如果滿足條件就執行某種操作，否則執行其他操作，執行到哪一步，需要根據條件作出選擇。(2)引入新知識，學習條件語句

算法中的條件結構可以用條件語句來實現，其一般格式與對應的程序框圖（書p10）如下： IF 條件

THEN

IF 條件

THEN

語句體1

ELSE

語句體

語句體2 END IF

END IF

[學生活動]：書翻到第10頁，把條件結構對應的兩種程序框圖寫出條件語句（運用新知）(3)解決問題1 [學生活動]：根據問題1所畫的程序框圖以及原先學過的輸入、輸出、賦值語句，編寫程序，同時教師隨機讓兩名學生板演：

INPUT

p

IF p<=30 THEN

y=0.3p

ELSE

y=0.3?30?0.5?(p?30)

END IF

PRINT y

END [教師小結]在應用條件語句編程時要注意以下幾點：

① 條件的判斷與執行語句的順序（首先對IF后的條件進行判斷，如果（IF）條件符合，那么（IHEN）執行語句體1，否則（ELSE）執行語句體2。② IF與END IF要配對使用，不能只用其一。

③ 區分END IF與END的區別，前者是結束條件語句，后者是結束整個程序。

④ 編寫程序時注意不要漏掉一些條件的結束語句，特別是條件語句比較多的時候，因此書寫的時候可由里向外將每個條件結構錯開位置。

3、簡單應用（隨堂練習）

練習1：將p11圖1.1?10中的程序框圖轉化為程序

問題2：閱讀下面的程序，你能得出什么結論？

① IF x>0 THEN ② TNPUT x

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專心 y=1 IF x<0 THEN ELSE x=-x y=0 END IF END IF PRINT x END [設計意圖]：使學生進一步認識條件語句，熟悉條件結構與條件語句的互化，進一步體會賦值語句、條件語句，而且還能鍛煉學生閱讀程序的能力。

問題3：編寫一個程序，求實數x的絕對值

[設計意圖]：不僅是為了應用條件語句，而且再次提供了完整經歷算法設計全過程的機會。

3、深入探究，條件語句的深層應用

問題4：將p12圖1.1?11求解一元二次方程ax?bx?c?0的算法的程序框圖轉化為程序 算法分析：觀察程序框圖可以發現，此題并不簡單，原因是框圖中包含了兩個條件結構，而且內層的條件結構是外層的條件結構的一個分支，屬于多層結構的嵌套問題。[設計意圖]：本例所設計的算法本質是“公式法”。是給出框圖之后，進而用條件語句來編寫程序。先給學生留有足夠的空間，放手讓他們去探索，若有困難，老師加以分析、提醒，如算術平方根的符號為SQR等等，再補充幾個比較常見的函數及功能，如ABS是x的絕對值，LOG是x取自然對數，它們都是QBASIC中的標準函數，可以直接應用，另外再補充QBASIC中常用的算術運算符，如?,/,??，MOD，分別表示乘，除，不等，余數，整除。[教師小結]：對于兩個條件結構嵌套的一般格式如下： TF 條件1 THEN 語句體1 IF 條件2 THEN 語句體2 ELSE 語句體3 END IF ELSE 語句體4 END IF 問題5：編寫一個程序，輸入兩個實數，并由大到小輸出這兩個數。

[設計意圖]：進一步認識算法的程序，并學習一些編程的小技巧，進而完成三個數的問題。算法分析：這是一道典型的可用條件結構的算法問題，設計的思路和問題3相似，完整地經歷了先用自然語言寫出算法步驟，接著畫出程序框圖，最后把程序框圖轉化為程序的全過程。本例的程序中使用的“小技巧”是借助一個中間變量“t”來交換兩個變量的值

INPUT “a，b=”；a，b IF b>a THEN

t=a

a=b

b=t END IF

PRINT a，b END

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2變式：編寫程序，使任意輸入的3個整數按從大到小的順序輸出。

[教師小結]：這個算法編程時主要是重復用到變量的交換，這是程序的關鍵之處。基本思想是先將a與b比較，把小者賦給b，大者賦給a；再將a與c比較，把小者賦給c，大者賦給a,此時a已是三者中最大；最后將b與c比較，大者賦給b小者賦給c，a、b、c就按大到小的順序排列了。

推廣：編寫程序，使任意輸入的n(n是正整數)個整數按從大到小的順序輸出。（生講思路）[設計意圖]：讓學生學會思考，理解知識間的聯系，學會舉一反三。練習2：

（1）讀程序,說明程序的運行過程: INPUT “Please input an integer:”;x IF 9

(3)閏年是指能被4整除但不能被100整除,或者能被400整除的年份,編寫一個程序,判斷輸入的年份是否為閏年? [設計意圖]：體現學習是再創造。學習不再看成是一種被動地吸收知識，通過反復練習強化儲存知識的過程，而是用學生原有的知識處理新的任務，并構建他們自己的意義。

4、歸納小結，啟發創新

問題6：通過本節課的學習，你學到了什么知識？

課后作業：設置一個含嵌套結構的問題，畫出程序框圖，編制相應的程序，準備交流。[設計意圖]：讓學生進一步體驗條件結構及條件語句的特征。同時，引導學生把學習的知識與實際問題相結合，體現學以致用的道理。

四、幾點反思

1、本節課主要學習了條件語句的結構、特點、作用以及用法，并能解決一些簡單的問題。條件語句一般用在對條件進行判斷的算法設計中，如判斷一個數的正負，確定兩個數的大小，解一元二次方程等問題，還有求分段函數的函數值等，往往要用條件語句，有時甚至要用到條件語句的嵌套。

2、本節課算法教學采用“問題教學”，從具體的學生熟悉的實例出發（問題1），創設情境，結合原有的知識，讓學生體會條件結構的特征；緊接著通過練習

1、問題

2、問題3，環環相扣，激發學生的興趣，發揮學生學習的主動性，使學生進一步認識、理解條件語句，熟悉條件結構與條件語句的互化，進一步體會賦值語句、條件語句，而且還能鍛煉學生閱讀程序的能力；然后通過問題4引出多重結構嵌套，深化對條件結構的認識；最后通過問題5以及變式與推廣，進一步認識算法的程序，并學習一些編程的小技巧，讓學生學會思考，理解知識間的聯系，學會舉一反三。

這樣的教學路線，使得學生在環環相扣的問題探究過程中，既有行動上的參與，更讓學生養成獨立思考，積極探索的好習慣。也正因為這樣，高中數學課程設立“數學探究”“數

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專心 學建模”等學習活動，為學生形成積極主動的、多樣的學習方式進一步創造有利條件，以激發學生的數學學習興趣。

3、條件語句是算法中的一個知識點，而算法本來屬于信息技術的內容，信息技術和數學課程內容的整合成為課程標準制定的一個基本理念。高中數學課程應提倡利用信息技術來呈現以往教學中難以呈現的課程內容，在保證筆算訓練的前提下，盡可能使用科學型計算器，各種數學教育技術平臺，加強數學教學與信息技術的結合，鼓勵學生運用計算機、計算器等進行探索和發現。而我們這邊的學生使用的都是一般的計算器，只有計算功能，沒有繪制功能，所有算法相應的程序語句是否可行、可靠？根本無法驗證，仍然是“紙上談兵”。對程序框圖的可行性缺乏驗證，會缺乏真實感的信任，會在一定程度上降低學生的興趣、參與的激情，課堂上如有機會，我們老師盡量通過計算機來驗證，不過效果不是很好，這是教學中令人非常遺憾的地方，希望在不久的將來能夠得到改善。

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專心 5