牛津小学英语6B Unit2

Unit1 谁比较年轻？在周日早晨，苏海在公园里散步。

她遇见了本和他的堂弟杰克。

她超级高兴见到他们。

他们坐在大树下聊天。

本：杰克，这是苏海。

她是我的同窗。

苏海，这是我的堂弟杰克。

苏海：很高兴见到你，杰克。

杰克：你好，苏海。

本：苏海有一个双胞胎姐妹。

她的名字叫苏阳。

杰克：真的吗？你们看上去一样吗，苏海？苏海：是的，咱们看上去一样。

杰克：你和你的双胞胎姐妹一样高吗？苏海：不，我比苏阳高。

杰克：谁比较年轻，你仍是苏阳？苏海：苏海比我年轻20分钟！杰克：太有趣了。

我想要某一天见到她。

苏海：你有一些兄弟或姐妹吗，杰克？杰克：不，我没有。

苏海：所以你是你家里的独生子。

杰克：是的，可是我的妈妈说吉米也是她的孩子。

苏海：谁是吉米？本：那是杰克的狗，他在这儿。

苏海：他是谁？杰克：他4岁了。

他比我小一岁。

苏海：哦，我明白了。

所以你有一个弟弟。

Unit2 更多锻炼吉姆擅长英语和数学，可是他不擅长体育。

他想要做得好一些可是不知道如何做。

他正在和他的父亲讨论关于它的事情。

吉姆：爸爸，我不高兴。

爸爸：怎么了？你做作业需要帮忙吗？吉姆：不。

我不擅长体育。

本跑得比我快。

他很强壮。

麦克和本跑得一样快，而且他也是一名优秀的足球运动员。

爸爸：可是我以为你跳得超级高。

吉姆：那是固然。

我比我班级里面的一些男孩跳的高。

爸爸：而且你游泳游得快。

吉姆：是的，可是我的朋友们比我游得快。

爸爸：别担忧。

多做些运动。

你会变得更强壮，而且你将更擅长体育。

吉姆：是的，爸爸。

天天我将起得更早而且在上学之前做些运动。

爸爸：真是一个好主意。

吉姆：我会在早晨慢跑去学校而且在下学后玩球类游戏。

不就我将会变得更强壮。

Unit3 问路史密斯先生来自澳大利亚，他此刻住在南京，他想去参观历史博物馆，可是他不知道路，他在问杨玲怎么去那。

史密斯先生：打搅一下，请问你能告知我去历史博物馆的路吗?杨玲：让我看看，额，沿着这条街，在第三个路口右转，博物馆就在你的左侧，你不会错过的。

牛津小学英语6BUnit2教案The first period教学要求：1、能听懂、会说、会读、会写单词low,slow.2、能听懂、会说、会读单词lower,high,higher,slower,fast,faster,3、能听懂、会说、会读、会写句子 Does Jim swim slowerthan David? No,he doesn't.He swims faster than David.教学重点：1、听得懂、会说、会读、会拼写单词 low,slow.2、听得懂、会说、会读、会写句子 Does Jim swimslower than david? No, he doesn't.He swims faster than David.教学难点：熟练掌握和正确运用四会单词和句型。

课前准备：将B部分分散的图绘制成一幅学生在进行各种活动的图。

布置学生调查填写表格（如下）Step1: Greeting1. sing a song "I wish I was taller"2.T:Let’s do some exercise .Follow me :Run,run,run fast. Swim,swim,swim fast.Jump,jump,jump high. Fly,fly,fly a kite. Fly,fly ,fly a model plane.1. T:(出示图）Look,the students are having a school festival today. They are all very happy.Let’s go and have a look. whatare they doing?S1:SuHai and SuYang are flying kites.S2:Ben and David are flying model planes.S3:The boys are running.2. T:Look,Mike runs fast.Teach:fast 快的，快地T:Does WangBing run fast,too?S:Yes,he does.T:WangBing runs fast.But Mike runs faster than WangBing. Teach:fsater 更快的，更快地Teach:Mike runs faster than WangBing.(板书) T: Plase look at the picture. Who runs faster than David?S: Jim runs faster than David.WangBing runs faster than David.Mike runs faster than David.Can you say: sb.runs faster than sb.S:Yes ,we can. Mike runs faster than Jim.S: WangBing runs faster than Jim.操练句型：Sb. runs faster than Sb.（根据调查表）3.Teach:Does xxx run faster than xxx?T:Does A run fast?S:Yes,he does.T:Does B run faster than A?S:Yes,he does./No,he doesn’t.T:Does C run faster than A?S:Yes,she does./No,she doesn’t.操练句型：Does xxx run faster than xxx?Yes,he/she does./No,he/she doesn’t.4.Teach:low,lowerT:Now ,the boys are swimming. Does Jim swim fast?S:Yes,he does.T:Does David swim faster than Jim? ?S:No,he doesn’t.T:Yes.Jim swims low.He swims lower than Mike.Teach:low （慢的，慢地） lower (更慢地)T:Does Jim swim slower than David?S:No,he doesn’t.He swims faster than David.板书这两句话。

（完整版）上海版牛津英语六年级下册6B重点知识点复习整理（最新整理）上海版牛津英语六年级下册6B重点知识点复习整理Module 1 City LifeUnit 1 Great cities in Asia【知识点梳理】1.方位词：east / west / north / south / north-east / north-west / south-east / south-west用法：a. 两地不相邻: e.g. A is north B. （= to the south of）b. 两地接壤: e.g. A is on the north of B.c. 所属关系，A包含B, B属于A: e.g. B is in the north of A.2. by + 交通工具表示“乘……交通工具”, 用how进行提问e.g. by bus / ferry / train / ship / underground… by plane = by air, by ship = by sea3. How far…多远（询问距离的远近，路程的长短）e.g. Hoe far is it from your home to school? 从你家到学校有多远？4. How long…多长，多久（询问时间的长短，提问一段时间）e.g. How long does it take to travel from Shanghai to Beijing by train? 坐火车从上海到北京要花多长时间？5. It takes (sb.) some time to do sth. 做某事需要花费多少时间e.g. It takes me five hours to make this modal plane. 做这个模型飞机花了我5个小时。

6. like / love / enjoy doing sth. 喜欢做某事e.g. The people in Bangkok like / love / enjoy eating spicy food. 曼谷人喜欢吃辛辣食物。

6B期末复习Unit 2 At the airportExercise 1I. Fill in the blanks according to the phonetic transcriptions.1. Mike has __________________ in Beijing since last month.2. In fact, you have __________________ of time to read.3. I have got a free __________________ to the show.4. He put his clothes into a black __________________ .5. Yesterday I bought a silk __________________ for my sister.II. Choose the best answer.（）1. Do you know where _________ passport is, Mum?A. myB. IC. meD. mine（）2. Have you been to the library _________, Tom?A. alreadyB. stillC. justD. yet（）3. You can take the _________ in the middle to go upstairs.A. toiletB. checklistC. liftD. trolley（）4. Look! There is _________ in the bag.A. enough spaceB. space enoughC. enough spacesD. spaces enough （）5. It usually _________ me 20 minutes to go to school on foot.A. costsB. takesC. paysD. spends（）6. —I’m afraid I’ve lost my way. I can’t find my hotel.—_________. I’ll help you.A. Thank youB. Never mindC. Excuse meD. Don’t worry （）7. I planned _________ a trip to the countryside on Sunday.A. takeB. to takeC. takingD. to taking （）8. There is _________ airport in this small city.A. aB. anC. theD. /III. Complete the sentences with the given words in their proper forms.1. We are __________________ (go) to fly to China this Saturday.2. I have been in the USA for 10 __________________ (year).3. Mum has already __________________ (pack) her small bag.4. Don’t forget to wear your __________________ (scarf), girls!5. Have you __________________ (get) the job, Jason?I. 1. lived 2. plenty 3. ticket 4. suitcase 5. scarf II. 1—4 ADCA 5—8 BDBBIII. 1. going 2. years 3. packed 4. scarves 5. gotExercise 2I. Fill in the blanks according to the phonetic transcriptions.1. The __________________ time of our flight is 1:20 p.m.2. Jason __________________ , “Where is my T-shirt?”3. He’s always __________________ about his weight.4. Look! There’s a __________________ near the door.5. I usually __________________ my car to work every day.II. Choose the best answer.（）1. The Smiths _________ in America for five years.A. livesB. livedC. livingD. have lived（）2. My cousin will arrive _________ the airport at 2 o’clock.A. inB. atC. onD. to（）3. The plane will leave _________ London in 10 minutes.A. ofB. forC. atD. on（）4. These _________ are made of silk.A. liftsB. scarvesC. addressesD. escalators（）5. I usually get up at 6:30 _________ the morning.A. atB. inC. onD. by（）6. My sitter hasn’t got her passport _________.A. justB. stillC. yetD. already（）7. They plan to stay at the hotel for _________.A.one and a half hoursB. one and a half hourC. one hour and halfD. one hours and a half（）8. Tom studies at _________ middle school in our city.A. anotherB. othersC. otherD. the othersIII. Rewrite the sentences as required.1. Mr Brown has lived in Shanghai for two years. （对划线部分提问）__________________ __________________ has Mr Brown lived in Shanghai?2. I will take the flight MU 586 to Los Angeles tomorrow. （对划线部分提问）__________________ __________________ will you take to Los Angeles tomorrow?3. Mrs White does much housework every day. （改为否定句）Mrs White __________________ __________________ much housework every day.4. We must get to school on time every day. （保持原意基本不变）We must __________________ __________________ school on time every day. 5. She has already bought the plane tickets. （改为一般疑问句）__________________ she bought the plane tickets __________________?I. 1. arrival 2. asks 3. worrying 4. trolley 5. driveII. 1—4 DBBB 5—8 BCAAIII. 1. How long 2. Which flight 3. doesn’t do 4. arrive at 5. Has, yetExercise 3I. Fill in the blanks according to the phonetic transcriptions.1. Have you brought your __________________ ?2. What does this __________________ mean?3. There’s a name __________________ on the suitcase.4. Linda is writing a __________________ for me.5. Jason has already got his __________________ card.II. Choose the best answer.（）1. Do you know there is _________ new airport in our city?A. anB. aC. theD. /（）2. Have you packed your suitcase _________, Tom?A. alreadyB. everC. justD. yet（）3. You can go to the top floor of the tall building by _________.A. cameraB. ticketC. liftD. trolley（）4. You can put your things in my bag, dear. There is _________ space.A.littleB. muchC. manyD. few（）5. Have you ever been to China _________, Mike?A. laterB. agoC. afterD. before（）6. _________ does the plane leave for London?A. WhatB. What timeC. HowD. How long（）7. Mr and Mrs Brown _________ in Beijing since 1998.A. liveB. livedC. are livingD. have lived （）8. Lily’s father usually drives _________ to school every day.A. herB. sheC. hersD. herselfIII. Complete the sentences with the given words in their proper forms.1. Which __________________ (fly) would you like to take?2. I think she is not __________________ (worry) about her work.3. We started early in order to __________________ (arrival) before dark.4. What’s the __________________ (depart) time of the flight MU 586?5. There are a lot of popular holiday__________________ (destination) in our city.I. 1. passport 2. sign 3. tag 4. checklist 5. boardingII. 1—4 BDCB 5—8 DBDAIII. 1. flight 2. worried / worrying 3. arrive 4. departure 5. destinationsExercise 4I. Choose an expression in the box which is the closest in meaning to the underlined part in each sentence.（）1. There are a lot of shops at the airport.（）2. Mona is going to the US by plane tomorrow.（）3. We must arrive at the airport before ten o’clock.（）4. Have you packed your suitcase, Joanna?（）5. At weekends, I usually go to see my grandparents in the countryside.II. Choose the best answer.（）1. Have you _________ a birthday present for Linda?A. boughtB. buyingC. buyD. buys（）2. —Have you returned the book to the library _________?—Yes, I have _________ returned it.A. yet; yetB. already; alreadyC. already; yetD. yet; already（）3. I’ve never been abroad _________.A. agoB. laterC. beforeD. after（）4. The little boy _________ up yet because he _________ to bed very late last night.A.hasn’t got, has goneB. didn’t get, wentC. didn’t get, has goneD. hasn’t got, went（）5. You see, we don’t have _________ to stand in the meeting room.A. enough spaceB. enough spacesC. spaces enoughD. space enough（）6. The students planned _________ a barbecue in the park.A. to haveB. haveC. hasD. had（）7. As we all know, we can get _________ information on the Internet.A. a lot ofB. a littleC. manyD. a few（）8. What is the _________ of this sign?A. meanB. meaningC. meansD. meanedIII. Rewrite the sentences as required.1. My sister Lucy has bought a new bicycle. （改为一般疑问句）__________________ your sister Lucy __________________ a new bicycle?2. Wendy has put a hat in the suitcase. （改为否定句）Wendy __________________ __________________ a hat in the suitcase.3. Mr Smith has played football for 40 minutes. （对划线部分提问）__________________ __________________ has Mr Smith played football?4. She went running for half an hour this morning. （保持原句意思基本不变）It took __________________ half an hour__________________ __________________ running this morning.5. already, the, Park, Disney, we, in, have, USA, visited, the (.) （连词成句）___________________________________________________________I. 1—5 CDBEAII. 1—4 ADCD 5—8 AAABIII. 1. Has, bought 2. hasn’t put 3. How long 4. her, to go 5. We have already visited the Disney Park in the USA.听力训练I.Listen to the passage and say whether the following sentences are true or false.（）14. The Smiths live in New York.（）15. In the morning, Mr Smith goes to work by car.（）16. The children, Mary and Jim, go to their school by bus.（）17. Mrs Smith always eats lunch with her friends.（）18. In the evening, Mrs Smith usually prepares dinner for the family.（）19. Mr Smith usually comes home late.II. Listen and fill in the blanks with the word you hear.20. The speaker likes travelling best, especially ______________ _______________.21. He thinks travelling is very ________________.22. He can get a lot of _______________ while travelling.23. He can also ______________ many new friends while travelling.24. Usually, when he reaches a beautiful place, he takes a lot of _______________.25. When he comes back, he can share interesting places and things with his ____________ and_____________.听力原文I. The Smiths live in New York. In the morning, Mr Smith goes to work by underground and the children, Mary and Jim, go to their school by bus. But Mrs Smith stays at home every day. She always eats lunch alone at noon. In the afternoon, she usually visits her friends. They often drink tea together. In the evening, when the children get back home, she is usually preparing dinner in the kitchen. But Mr Smith usually comes home late.（14—19 TFTFTT）II. I have many hobbies. Of all the hobbies, I like travelling best, especially by plane. I think travelling is very exciting. I can see beautiful scenery while travelling, and I can also get a lot of knowledge. What’s more, I can make many new friends when I am travelling. Usually, when I reach a beautiful place, I take a lot of photos. So when I come back, I can share interesting places and things with my friends and relatives. It makes me feel very happy.（20. by plane 21. exciting 22. knowledge 23. make 24. photos 25. friends, relatives）阅读提高A. Choose the best words or expressions to complete the passage.It is exciting to visit different places. As you travel, you will see ___1___ sceneries (风景). Besides, you can meet and make ___2___ with people of different colours and races (种族). You can also get to know the customs and living habits of the local people.Today people are so fond of ___3___ that tourism has become one of the faster growing industries in most countries. The main ___4___ why people like travelling is, perhaps, for pleasure. For example, having worked hard throughout the weekdays, people like to take a trip to the nearby mountains or beaches to relax. For another reason, spending a holiday travelling abroad is an especially wonderful experience for those who do not have an opportunity to be away from their homeland. When people return from their travel, they will generally feel ___5___ and energetic (精力充沛的), and be ready to work harder.（）1. A. beautiful B. useful C. helpful D. musical（）2. A. food B. money C. friends D. plans（）3. A. living B. eating C. travelling D. reading（）4. A. custom B. reason C. idea D. example（）5. A. fresh B. friendly C. angry D. worried1—5 ACCBAB.Read the passage and fill in the blanks with proper words.●Never try to work when you are hungry. If you decide to do your homework right after school, you should get something to e___1___ before getting to work.●Always do your homework before you get too tired. Don’t wait until very late in the evening, or your work will seem much h___2___ than it really is.●If you have more than an hour’s work, give yourself a break a___3___ an hour. But don’t break so long that you can’t get anything done. You should be able to work at least half an hour at a time without s___4___.●Do your homework at the s___5___ time every evening. This will help you make it a habit. It will make it easier to do, and it will make your free time more enjoyable as well.1. __________2. _________3. __________4. _________5. __________1. eat2. harder3. after4. stopping5. sameC.Answer the questions.Dear Tom,Thank you very much for your letter. I am glad that you enjoyed the holiday with us. We also enjoyed having you and your sister here. We hope that you will both be able to come again next year. Perhaps you’ll be able to stay longer next time. A week is not really long enough, is it? If your school has five weeks’ holiday next year, perhaps you will be able to stay with us for two or three weeks.We have been back at school for three weeks. I expect that you are both working very hard because you are in Grade Six now. John and Ann won’t be in Grade Six until next year. They went on a picnic yesterday but I didn’t go with them, because I hurt my foot and I couldn’t walk very well. They went to an island and enjoyed themselves there.John, Ann and I send our best wishes to you. We hope to see you soon.Yours,Michael1. Who stayed with Michael, John and Ann for the holiday?__________________________________________________2. How long did they spend their holiday together?__________________________________________________3. Is Tom in Grade Six now?__________________________________________________4. Who will be in Grade Six next year?__________________________________________________5. Why didn’t Michael go to the island for a picnic yesterday?__________________________________________________1. Tom and his sister.2. For a week.3. Yes, he is.4. John and Ann.5. Because he hurt his foot and he couldn’t walk very well.11。

小学英语 6B Unit2《More exercise》江苏省兴化市新生中心小学王婷婷邮编：225700一、教案背景：1.面向学生：√小学2.学科：英语2.课时：13.学生课前准备：1）、听录音，预习本课单词；预习课文，了解课文大意。

2）、复习以前学过的比较级。

二、教学课题：牛津小学英语6B Unit2《More exercise》Part A1.能听、说、读、写单词和词组more, be good at.2.能听、说、读单词和词组jog, do well in, need help with, do more exercise, player, true, ball games.3.能听、说、读、写句型Ben runs faster than Jim.4.能听、说、读日常交际用语That’s true. Mike runs as fast as Ben.5.能正确理解A部分对话内容，并能熟练朗读。

三、教材分析：从本单元的课题“More exercise”来看教材内容主要是围绕如何进行体育锻炼而展开的话题，是继第一单元出现的形容词比较级的进一步学习。

通过课文重点语言知识点的学习，进一步提高学生听、说、读、写综合语言运用能力。

四、教学方法：本课是牛津小学英语6B Unit2 More exercise 的第二教时。

第一课时中已经完成了对主要句型及副词比较级的学习。

本课的主要任务是完成课文教学，课文中涉及到了be good at, do well in, need help with, some of the boys, do more exercise, jog to school等知识点。

《英语课程标准》提倡以人为本，遵循“为用而学，在用中学，学了就用。

”设计本课时，从学生的实际出发，逐个解决各个知识点，通过师生间的问答、操练，把难点分散在各个环节中，不漏痕迹地完成了重难点的处理，为学生理解课文打好了基础。

Unit2 Good habits知识汇总【词汇】1、habit 习惯2、tidy干净的；整齐的3、fast 快的4、never 从不5、late 迟到，晚到6、finish完成7、child 孩子，小孩 8、put…in order把……放得井井有条9、bad 不好的,坏的10、sleepy 困的,困倦的11、last night 昨夜12、go into 走进，走入13、slowly慢速地14、badly 差地，不好【词组短语】1、a good boy 一个好男孩2、have many good habits 有许多好习惯 a bad habit 一个坏习惯3、get up early in the morning在早晨早早地起床4、never go to bed late 从不晚睡觉5、go to bed early 早早睡觉6、before bedtime 睡前7、go to bed late last night 昨晚很晚睡觉8、finish his homework完成家庭作业9、before dinner 在晚饭前11、after lunch午饭后12、shouldn’t go home late不应该晚回家13、do well at home 在家做得好14、keep his room clean and tidy 保持房间干净并整洁15、also help his parents do housework 也帮助他的父母亲做家务16、do his homework late at night 在晚上家庭作业做得晚17、brush his teeth 刷他的牙齿18、feel sleepy 感觉困得19、know her well 非常了解她20、always put things in order 总是把东西摆得井井有条21、walk fast/slowly 走得快/慢22、run very fast 跑得非常快23、listen to his teacher at school 在学校听老师讲24、have breakfast on time 准时吃早饭27、wash your face at seven o’clock在七点洗你的脸29、show you around the house 带你参观房子30、go into the living room 进入起居室31、big and clean 又大又干净32、small and nice 小而干净33、a lot of books and toys 许多书和玩具36、put your books and toys in order 把你的书和玩具整理好37、sing badly 唱得不好39、swim well 游得好40、pick one 挑一个41、pick up 捡起来 pick it up/pick them up（宾格放在中间）42、pick apples 摘苹果【句型】1.He gets up early in the morning and never goes to bed late.他早上起床早，从来不晚睡。

6B Unit2 练习姓名______第一课时一英汉互译1.善于2.所有其他的学生3.一位好的足球运动员4.起得更早5.一些问题6.在……方面做得好7.jog to school 8.get stronger9.do more exercise 10.some of the boys二用所给词的正确形式填空1.Ben ______(run) ________(fast) than some of the boys in his class.2._____ Nancy swim_______(slow) than Helen?3.Fangfang is not as______(tall) as the other girls.4.My eyes are_______(big) than_____ (she).5.Which is________(heavy), the elephant or the pig?6. He watches________( many) cartoons than ____ (she) yesterday.三根据课文内容填空Jim is English and Maths, but he does not __________PE. He is ________________ the other children. He wants to __________ but does not know how. He is talking to his dad about it.第二课时一写出下列副词的比较级1.high_______te_________3.fast______4.ill_______5.early______6.far_______7.low_______8.much _________9.slow _____ 10.well______ 11.many_________二应用所学副词的比较级，看B部分图片，完成短文：Today the children join in different activities. Su Yang flies the kite ______ , but Su Hai flies the kite______ . Nancy swims ______ , but Liu Tao swims ______. Mike flies the model plane ______ , but David flies the model plane ______. Jim jumps ______ , but Liu Tao jumps ______ . Su Hai skates ______ , but Yang Ling skates ______ . Jim and David run ______ , but Wang Bing and Mike run _______ .三选择( )1.Does Su Hai skate ______ Su Yang?A. well thanB. better thanC. good than( )2.He likes ___football. He’s good ___football.A. playing; inB. play;atC. playing at( )3.My mother often gets up ___ than me. A. early B. earlyer C. earlier( )4.Do ___ exercise and you’ll be___.A.much strongB.many strongC.more stronger( )5.Mike ___ skate as well as Jim.A. not B, doesn’t C.don’t第三课时一英汉互译1.be good at2.do exercises3.have a lots of fun4.in the sports field5.animal show6.想要做得更好7.比……更喜欢8.一名优秀的足球运动员9.有些男生10.我们所有人二选择题( )1.Jim is good ___ Chinese and English. A.at B.of C.on D.in( )2.Lucy is as ____ as Lily.A.old B.older C.oldder D.oldest( )3.Do you need help ____ your homework? A.in B.with C. of D. at( )4.They saw many birds ____ in the tree. A.sing B.sings C.singing D.sang( )5. He can fly a kite _______than I.A.high B.highest C.higher D.as high三改写句子1.We are good at swimming. (同义句) We _____ _____ _____ swimming.2.Tom is 65kg,Lily is 45 kg. (同义句) Tom is ________ ______ Lily.3. He goes to school on foot every day. He _____ _____ _______ every day.4.The ducks don’t swim as fast as the fish. (同义句)The fish swims _______ than the ducks.5. He can jump farther than the other students. (同义句)He can jump farther than _____ ______students.6. He does well in football.(一般疑问句）____ he _____ ____ _____ football?第四课时一英汉互译1.游得比我慢2.跳得和你一样高3.上学更早4.在体育方面做得更好5.一位篮球运动员6.Well done!7.animal show 8. like Maths better9. do morning exercises 10.need help with English二选择填空( )1.Tom is good at ___ basketball. A. play B. played C. playing D. to play ( )2.___ Sunday morning, Su Hai went _____ a walk in the park .A.On; forB. At; forC. At; toD. On : to( )3.Which bag does she like_____, the red one or the blue one?A. wellB. goodC. bestD. better( )4.I am 30kg. He is 25 kg. I am _____ than him.A.heavyB. BigC.heavierD. bigger( )5. Do more exercise and you’ll get _____.A.fatB.strongerC.smallD.heavier( )6.Who’s ____than Helen? Nancy is.A. fatB.heavyC.thinerD.taller( )7. I can _____ school in the morning.A.jogB.joggingC.jog toD.jogging to( )8.Mary speaks English better than all of ___.A. themB.theyC. theirD.theirs。