资源简介 (共7张PPT)话题写作实境运用【话题导航】本单元教材写作情境为“家人”,属于“人与自我”主题范畴中的“家庭”这一主题群,涉及子主题“家人和亲人”。此类写作要求学生能够运用一般现在时和名词所有格来描述自己的家庭。【典型例题】假设你是李明,你的英国朋友萨莉(Sally)发来邮件想了解你家人的情况。请你用英语写一封电子邮件,介绍一下你的家人,包括家人的外貌、喜好和职业等。【审题指导】★审主题: 介绍家人 ★审体裁: 应用文★审人称: 第一、第三人称 ★审时态: 一般现在时★审要点: 外貌、喜好、职业【思路点拨】【素材储备】1. 在周末 at weekends 2. 在一家医院 in a hospital 3. 骑自行车 ride a bike 4. 玩得开心 have fun at weekendsin a hospitalride a bikehave fun【范文展示】Dear Sally,How are you Now let me tell you something about my family.There are three people in my family. They are my parents and me. My father is tall and thin. He is a taxi driver. He really likes sports and often plays basketball at weekends. My mother is very beautiful. She is a doctor. She works hard in a hospital to help sick people. I am a student. I am short. I like riding a bike. When we all have time at weekends, we often go to the park and have fun there.I love my family and I'm very happy.Yours, Li Ming【实战演练】假设你是李明,请根据下面所给信息,用英语写一篇短文介绍你和你的家人。1. 李明:15岁,爱好踢足球,最喜欢的颜色是红色;2. 父亲:演员(actor),会游泳、打篮球;3. 母亲:英语老师,和张华的妈妈在同一所学校,喜欢吃健康的食物;4. 妹妹:李丽,12岁,学生,在七年级(1)班,在她班里有40个学生。注意:1. 短文中不能出现真实的姓名和学校名称;2. 短文内容须包含上述所有要点,不能有遗漏;3. 词数80左右。My name is Li Ming. I'm 15 years old. I like playing football. My favourite colour is red. My father is an actor. He can swim and play basketball. My mother is an English teacher. She and Zhang Hua's mother are at the same school. She likes to eat healthy food. My sister is Li Li. She is 12 years old. She is a student. She is in Class One, Grade Seven. There are 40 students in her class. I love my family very much. What about you My name is Li Ming. I'm 15 years old. I like playing football. My favourite colour is red. My father is an actor. He can swim and play basketball. My mother is an English teacher. She and Zhang Hua's mother are at the same school. She likes to eat healthy food. My sister is Li Li. She is 12 years old. She is a student. She is in Class One, Grade Seven. There are 40 students in her class.(共12张PPT)第4课时 Section B (1a—2b)Lily is from Ireland. She loves her big family. Here's a 1. photo (照片) of her family. She is the one with a pink hat. Her dad, Fred, is on the 2. left (左边). He is very handsome and often 3. plays (play) tennis with her. Her little brother, Sam, who is seven years old, is on their dad's knee. Sam 4. really (real) likes chess. Her mum, Jane, is on the right. She is beautiful and 5. kind (善良的). She always reads her a 6. story (故事) at night. Her grandparents, Jack and Sarah, are in the middle. They are her 7. dad's (dad) parents. They have a dog named Oscar. photo left plays really kind story dad's Her grandparents have three 8. grandchildren (grandchild): Sam, her cousin Lucy, and her. They often say she is their 9. favourite (最喜欢的) grandchild. But she believes they say the 10. same (相同的) thing to every grandchild.1. Sally's favourite colour is pink (粉红色). 2. My brother is tall and handsome (英俊的). 3. A cat is on my father's left knee (膝盖). 4. Old Henry has three grandchildren (孙子). Ⅰ. 根据首字母及汉语提示完成下列单词的拼写,使句意明确,语言通顺。 5. Mr Smith's son (儿子) works in a cinema. grandchildren favourite same ink andsome nee randchildren on Ⅱ. 用括号中所给单词的适当形式填空。6. Here is (be) a map for you. 7. I spent one night's (night) time making a video called Mei Lanfang and His Hometown. 8. (2024·四川成都中考改编) They like hiking (hike) up the mountains in the free time. 9. My father is funny (fun) and he always makes me laugh. 10. Their (they) room is big and tidy. is night's hiking funny Their —They're my mother and father.A. Where B. How C. Who D. What(B)12. —Sally, who is the girl your right in the photo —She is my sister, Jane.A. in B. on C. at D. from写出下列画线词的意思。(1) The hospital is on the right of the park. 右边 (2) It is not right to eat food in class. 正确的 (3) I have the right to ask you a question. 权利 Ⅲ. 单项选择。(C)11. — are they B右边 正确的 权利 C(B)13. Uncle Wang is very . He likes helping others very much.A. strong B. kindC. healthy D. tall(D)14. —What's your uncle like — . A. He is a teacher B. He likes catsC. He is very tall D. He is very niceⅣ. 根据汉语意思完成句子,每空一词。15. 冰岛有什么好玩的 What is fun about Iceland BDfun about 16. 我们学校在医院旁边。Our school is next to the hospital. 17. 迈克喜欢晚上读书。Mike likes reading at night . 18. 中间是我的妹妹。In the middle is my sister. Ⅴ. 阅读理解。Welcome to my blog(博客)! 体裁:应用文 主题:人与自我·个人情况 难度:★★ 建议用时:7 minnext to at night In middle About meMy name is Helen Smith. I'm 13. My friends say I am a good girl.My familyHere you can see the photo of my family. My grandmother, parents, brother and I are in it.My friendsAlice and Cindy are my friends. They are 12 and 14. They are like sisters to me. They always help me. And I want to say“ ▲ ”to the two girls. My schoolI am in Bridge Middle School. My classroom is big. A computer, a bookcase and a clock are in it. The library and the computer room in my school are big too. My teachers are nice.(C)19. 【新考法·图片理解】Helen's family photo is .A. B.C. D.(D)20. Who is Cindy A. Helen's sister. B. Helen's teacher.C. Helen's cousin. D. Helen's friend.(A)21. 【新考法·语段回填】What can be put in the “ ▲ ” A. thank you B. good morningC. you're welcome D. excuse meCDA(C)22. What can't we see in Helen's classroom A. A bookcase. B. A clock.C. A radio. D. A computer.Ⅵ. 阅读下面短文,并用英语回答问题(请注意每小题的词数要求)。Dear Lisa, 体裁:应用文 主题:人与自我·个人情况 难度:★★ 建议用时:7 minCThanks for your family photo. It's great! Here is a photo of my family. Do you know who they are The woman on the sofa is my mother. She is an English teacher. The man in blue is my father. He is a doctor and he works in a hospital. He is very busy every day. This boy is my brother. His name is Xiao Yong. He is nine years old. We often do homework, read books and watch TV together. We play games together too! Who is the girl with long hair It's me. I am twelve. I am a student in a middle school. My teachers and classmates are nice to me. I love my school very much! Where is my dog Wang Cai Oh, it's under the table. You can't find it in the photo.Yours,Li Mei23. Where does Li Mei's father work (不超过5个词)In a hospital./He works in a hospital. 24. What does Li Mei look like (不超过5个词)She has long hair. 25. Where is Li Mei's dog according to the text (不超过5个词)It's under the table. In a hospital./He works in a hospital.She has long hair.It's under the table.(共14张PPT)第1课时 Section A (1a—1d)—PronunciationⅠ. 选出每组单词中画线部分发音不同的一项。(D)1. A. learn B. turn C. first D. eraser(A)2. A. horse B. worker C. ruler D. doctor(C)3. A. son B. love C. hot D. cut(B)4. A. park B. carrot C. yard D. farmⅡ. 根据画线部分读音将方框内的单词按音标分类。5. / /: bird; girl 6. / /: father; after 7. / /: sun; but bird; father; sun; star; but; car; after; girl8. /ɑ /: star; car DACBbird; girl father; after sun; but star; car Ⅲ. 根据首字母及汉语提示完成下列单词的拼写,使句意明确,语言通顺。9. Who (谁) is your English teacher 10. 【人与社会·民族意识】56 nations(民族) are in a big family (家庭). 11. 【教材改编】What does it mean (意思是) to you 12. Jenny's husband (丈夫) is a doctor. ho amily ean usband Ⅳ. 单项选择。(B)13. —Who's that boy —He is my , and his mother is my aunt. A. sister B. cousinC. teacher D. grandfather(C)14. — is the girl — is my sister. A. What; He B. What; SheC. Who; She D. Who; He(D)15. This my sister, and those my friends.A. is; is B. are; areC. are; is D. is; areBCD(D)16. Please come(来) and meet my . A. phone B. schoolC. name D. cousinD17. 这是你的妹妹吗 Is this your sister 18. 这是我的父亲。他是一名医生。This is my father . He is a doctor. 19. 那些不是我的朋友。Those aren't my friends . 20. 这两位是迈克的父母。These are Mike's parents. Ⅴ. 根据汉语意思完成句子,每空一词。Is this sister This is father Those aren't friends These are Ⅵ. 句型转换。21. This is his brother.(改为复数形式)These are his brothers . 22. Those are keys.(改为单数形式)That is a key. 23. David is my brother.(改为一般疑问句)Is David your brother 24. —Is Tony her brother (作肯定回答)—Yes, he is . These are brothers That is Is your he is A: Good morning! 25. A Ⅶ. 补全对话(其中有两项为多余选项)。B: Yes, I am. What's your name A: 26. C B: Hi, Jane. Nice to meet you.A: 27. F B: Jane, who's she A: 28. G B: Oh, I see. 29. D A: Thanks! You too. Bye!A C F G D B. He's my brother.C. My name is Jane.D. Have a good day!E. Is she your sister F. Nice to meet you too.G. She is my friend Mary.A. Are you Grace Ⅷ. 阅读短文,在空白处填入一个适当的单词或用括号内单词的适当形式填空。Hi, boys and girls. My name 30. is (be) Sun Yue. Nice 31. to meet (meet) you. I am a mother of two children. I have a son 32. and a daughter. Look! Here is a photo of 33. them (they). My daughter is eight years old. 34. Her (she) name is Zhang Aihua. She speaks English 35. well (good). The boy is my son Zhang Feiyang. He is ten and loves sports. He 36. has (have) a basketball. He often plays basketball with his 37. classmates (classmate) at weekends. They are in 38. the same school. They often go to the school library and spend(花费) a lot of time 39. reading (read) there. They are really good kids. I love them so much. is to meet and them Her well has classmates the reading ①I am John Brown. I am from England. I have a happy family. There are nine people in my family. They are my grandparents, my parents, my two sisters, my brother, my brother's wife and me.②My grandparents are old and they like planting flowers in the garden. My father is a farmer and he has a big farm. My mother doesn't go to work. What does she do at home Oh, she does housework. 体裁:记叙文 主题:人与社会·和谐家庭 难度:★★★ 建议用时:6 minⅨ. 阅读理解。③My brother is a doctor. He works in a hospital. His wife works in the hospital too. But she is a nurse. My two sisters are students. Helen wants to be an English teacher. Her English is very good. Julia likes to sing very much. She can sing very well. I'm in China now. I teach English in a middle school.④I have a happy and big family.(2025·浙江金华期中)(C)40. Who is a teacher in the family A. Julia. B. Helen.C. John. D. John's father.C(D)41. What does the underlined word “housework” in paragraph 2 mean in Chinese A. 家庭作业 B. 社区劳动C. 农活 D. 家务活(C)42. 【新考法·篇章结构】Which is the right structure(结构) of the text (①=paragraph 1 ②=paragraph 2, ...)A. B.C. D.DC(B)43. What's the best title for the text A. My ParentsB. My FamilyC. My SchoolD. A Good TeacherB(共7张PPT)第5课时 Project (3a—3c)—ReflectingⅠ. 单项选择。(A)1. —Mr Smith's son is only five years old, but he knows a lot.—Really How he is!A. clever B. handsomeC. friendly D. busy(B)2. —What's his favourite —Dogs.A. colour B. animalC. cap D. sport(D)3. Shirley likes cooking and reading, but her sister .A. isn't B. aren'tABDC. don't D. doesn't(D)4. —Is your aunt short —No, she isn't. She's . A. beautiful B. coolC. thin D. tall(C)5. I like table tennis games on TV at weekends. A. finding B. playingC. watching D. helpingDCHello! I'm Sally. Let me tell you about my 6. family . This is my dad. He is 7. handsome . He's also very 8. funny and often tells us jokes. In his free time, he likes to play 9. football . He says it makes him strong and healthy. This is my mum. She is beautiful and 10. kind . She is always ready to help others. Her hobby is to go 11. hiking . She enjoys the fresh(新鲜的) air and the beautiful views(风景) in the mountains. I'm a tall girl. I'm always 12. happy . I really 13. love animals. I have a pet dog and I play with it every day. Ⅱ. 从方框中选择正确的单词填空。happy; love; football; hiking; big; kind; reading; handsome; family; funnyfamily handsome funny football kind hiking happy love This is my little brother. He has 14. big eyes and he is very clever. He likes 15. reading a lot. He often reads storybooks before going to bed. I love my family very much.Ⅲ. 阅读理解。 体裁:应用文 主题:人与自我·家庭情况 难度:★★ 建议用时:6 minbig reading (B)16. Who is Ian A. Dylan's son. B. Diego's father.C. Isaac's uncle. D. Bob's brother.(A)17. Who is Alondra's mother A. Mikaela. B. Valentina.BAC. Amaia. D. Sofia.(D)18. What's the name of the dog A. Hank. B. Coco.C. Dick. D. Noah.D(共14张PPT)第2课时 Section A (2a—2e)Ⅰ. 根据首字母及汉语提示完成下列单词的拼写,使句意明确,语言通顺。1. Jenny has two ping pong bats (球拍). 2. They have many activities (活动) after school. 3. I like to play chess (国际象棋) with my grandpa. 4. She spends (花费) two hours running in the playground every Friday evening. 5. After breakfast, we go to school together (在一起). Ⅱ. 用括号中所给单词的适当形式填空。6. These (this) are Linda's erasers. 7. We have a holiday for two weeks (week). ats ctivities hess pends ogether These weeks 8. My sister can play the guitar well (good). 9. Does your mother like gardening (garden) 写出下列画线词的意思。(1) What do you want to do in the garden 花园 (2) Why not help your father garden this afternoon 做园艺工作 10. This blue jacket is my sister's (sister). Ⅲ. 单项选择。(B)11. — is this cap —It's Bill's.A. Who B. Whose C. Where D. Howwell gardening 花园 做园艺工作 sister's B(C)12. On Sunday, Sally spends an hour games with her friends.A. play B. playsC. playing D. to play(D)13. —Is this ruler yours, Lin Hai —No, it isn't. The yellow is my ruler. A. it B. thisC. that D. one(B)14. Mary often plays piano or play erhu in her free time.A. a; / B. the; theC. the; a D. an; theCDB(D)15. — your brother play basketball —No. He plays tennis.A. Is B. DoC. Are D. Does(D)16. —Do you have a jacket — . I have a blue jacket. A. Yes, it is B. Yes, I amC. No, I don't D. Yes, I doDDⅣ. 根据汉语意思完成句子,每空一词。17. 你有一个钓竿吗 Do you have a fishing rod 18. 玛丽每天打乒乓球。Mary plays ping pong every day . 19. 看!院子里有很多鹅。Look! A lot of geese are in the yard. 20. 他读了很多关于运动(的内容)。He reads a lot about sports. 21. 布朗先生中国象棋下得非常好。Mr Brown plays Chinese chess really well. fishing rod plays ping pong every day lot of reads a lot Chinese really A: No, I don't. But I have a soccer ball. 23. C B: No. 24. G Let's play ping pong. I have a ping pong bat. A: 25. D B: It's in my bag. Do you have a bat A: No, I don't. But my brother has a bat and a ball.B: Good. Where is he A: 26. A Ⅴ. 补全对话(其中有两项为多余选项)。A: Let's play tennis.B: 22. B But I don't have a tennis bat. Do you have one C G D A B A. He's in his room.B. That sounds good.C. Let's play soccer.D. Good. Where is it E. Let's play basketball.F. Do you have a tennis bat G. That sounds boring(无聊的).Ⅵ. 完形填空。 体裁:说明文 主题:人与社会·和谐家庭 难度:★★ 建议用时:7 minKaren is my grandfather. He is my mother's 27 . He is sixty two years old now. He likes playing baseball(棒球). He thinks it's 28 . He has eight baseballs and four baseball bats. He also has some baseball 29 . He always wears one of them. His favourite is a white one, because white is his favourite 30 . Karen has 31 children, a son and a daughter. They both like sports too. 32 son is Carl. Nancy is his daughter. His son, my uncle, Carl has a 33 collection(收藏). He has 10 tennis rackets,12 footballs, 6 basketballs and 18 volleyballs, 34 he doesn't play sports. Nancy is my 35 . She likes volleyball, but she doesn't 36 it. She only watches it on TV every day. She always watches TV after dinner. (B)27. A. brother B. fatherC. son D. sister(C)28. A. bad B. difficultC. interesting D. fine(D)29. A. bags B. boxesC. rooms D. capsBCD(A)30. A. colour B. numberC. card D. family(A)31. A. two B. threeC. four D. five(C)32. A. My B. HerC. His D. Your(D)33. A. telephone B. pencilC. CD D. sports(B)34. A. and B. butC. or D. because(B)35. A. aunt B. motherAACDBBC. cousin D. sister(A)36. A. play B. spellC. see D. getA选出下列画线词的意思。A. v. 当心 B. v. 观看 C. n. 手表(1) I lost my watch. I can't find it now. C (2) I like watching TV. B (3) Watch! The floor is wet(湿的). A C B A (共14张PPT)核心素养综合练重难题组训练laugh的用法根据汉语意思完成句子,每空一词。1. 杰克很有趣,他总是让我们笑。Jack is really funny and he always makes us laugh . 2. 她的笑声使我感到温暖。Her laugh makes me feel warm. 3. 请不要嘲笑那位可怜的老人。Please don't laugh at the poor old man. makes us laugh Her laugh laugh at spend与take的辨析Ⅰ. 单项选择。(B)1. —Do you exercise every day —Yes. I one hour walking in the park. A. begin B. spendC. give D. takeB(A)2. It him forty minutes to do his homework in the evening.A. takes B. needsC. keeps D. spendsⅡ. 根据汉语意思完成句子,每空一词。3. 她从不在游戏上花时间。She never spends time on games. 4. 做作业通常(需要)花费我30分钟。It usually takes me 30 minutes to do the homework. 5. 我们每周花两个小时打篮球。We spend two hours playing basketball every week. fun与funny的辨析Aspends time on takes to do spend playing Ⅰ. 根据句意,用funny或fun填空。1. Peter learns to draw just for the fun of it. 2. What a funny/fun story it is! We all like it. 3. I'm sure you can have fun at the party this evening. Ⅱ. 情景选择题。(B)4. 当你想形容一部电影非常滑稽好笑时,你可以说:A. The movie was so fun. B. The movie was so funny.fun funny/fun fun B(A)5. 当你想告诉同学郊游玩得很开心时,你可以说:A. We had a fun time on the trip.B. We had a funny time on the trip.A语篇组合训练Ⅰ. 完形填空。I live with my 6 year old son in a small house. I have two 1 to make money and I am tired after work every day. My smart son can feel it when we are together. 体裁:记叙文 主题:人与自我·家庭生活 难度:★★★ 建议用时:8 minOne night, I am 2 him a story about the Green family. The Greens is rich and it has everything like a new car, a big house and a beautiful garden. It is a new world. The world is 3 from our world, like a fairy tale(童话故事). Tears(眼泪) come to my eyes. I turn around(转身) 4 my son can't see me like this. But my smart boy can 5 my feeling. He says, “Mum, don't cry. The 6 has a lot of things, but you know we are rich too.” I am not sure about his 7 . He goes on, “We do not have a lot but we 8 each other, and we love each other. Money can't 9 that so we are also rich.” I 10 him and smile, “Yes, you are right. Let me give you a kiss(吻).” This kiss will be with us forever(永远) and I thank my son for giving me this great lesson. (A)1. A. jobs B. classesC. parties D. festivals(A)2. A. reading B. sayingC. talking D. writing(C)3. A. nice B. tidyC. different D. welcome(D)4. A. or B. but C. and D. soAACD(B)5. A. put B. get C. speak D. spell(A)6. A. family B. man C. school D. class(D)7. A. hobbies B. jobsC. mistakes D. words(D)8. A. call B. see C. wait D. have(C)9. A. help B. love C. buy D. sell(B)10. A. look after B. look atC. look for D. look upⅡ. 阅读理解。 体裁:说明文 主题:人与自我·家人和亲人 难度:★★ 建议用时:6 minBADDCBHello, I'm Becky Smith. I'm an English girl, but now I'm in Kaifeng, China with my family. I'm in Jinming Middle School. Here is a photo of my family.These are my grandparents, Mike and Jane. They're my mother's parents. My mother's name is Cathy and my father's name is Jeff. This is my aunt. She is my mother's sister. Her name is Mary Green. And Simon Green is my uncle, Mary's husband. That is Heizai and it is their pet. It is a brown and white dog. These are my brother and sister. My brother's name is Paul, and my sister's name is Cindy. They are in Jinming Middle School too. They are with my parents in this photo. But I'm not in this photo.A. Mary's uncle. B. Mary's father.C. Paul's cousin. D. Jeff's brother.(D)12. What's the name of Becky's mother A. Jane. B. Mary. C. Cindy. D. Cathy.(C)13. 【新考法·组合型选择】 Who are in Jinming Middle School ①Paul ②Becky ③Simon④CindyA. ①②③ B. ①③④C. ①②④ D. ②③④(B)11. Who's Mike DCB(共10张PPT)第3课时 Grammar Focus (3a—3d)一、一般现在时二、名词所有格Ⅰ. 用括号中所给单词的适当形式填空。1. Linda likes (like) playing Chinese chess. 2. Sun Mei often wears (wear) black shoes. likes wears 3. My grandmother's (grandmother) garden is very nice. 4. These officers' (officer)(官员) wish is to change the life of the local(当地的) children. 5. The teacher's (teacher) desk is clean and tidy. grandmother's officers' teacher's Ⅱ. 根据句意,用do、does、don't或doesn't填空。6. —Do you have a basketball —Yes, I do . 7. —Do your parents have a computer —No, they don't . 8. —Does he have a basketball —Yes, he does . 9. —Does Lucy have a ping pong bat —No, she doesn't . 10. —Do Jack and John have any balls —Yes, they do . Do do Do don't Does does Does doesn't Do do Ⅲ. 单项选择。(A)11. Xia Sen a simple(简朴的) life and saves her money for donations(捐赠).A. lives B. livedC. is living D. will live(B)12. —Who is that lady —She's Miss Green. She us music, and she is so good. A. taught B. teachesC. will teach D. is teaching(C)13. Bill along with Miss He in the playground every morning.A. will run B. is runningC. runs D. ranABC(C)14. Tom and his sister tennis. They think it's boring.A. love B. lovesC. don't love D. doesn't love(D)15. — he have a clock —No, he . He has a watch. A. Does; don't B. Do; doesn'tC. Do; don't D. Does; doesn't(A)16. (2025·北京延庆期末)—Susan, what do you often do at weekends —I often my grandparents.A. visit B. visitedC. visits D. will visitCDA(A)17. My parents took me to the amusement park(游乐园) on Day. There were so many exciting things to do there.A. Children's B. ChildrenC. Child's D. Child(A)18. father is a pilot(飞行员). He has been to(已经去过) many countries around the world.A. Tony and Peter'sB. Tony's and PeterC. Tony's and Peter'sD. Tony and Peter(B)19. —Excuse me, where is Ms Lee A student is looking for her.—She is talking to fathers outside the teachers' building.AABA. Jim and SallyB. Jim's and Sally'sC. Jim's and SallyD. Jim and Sally's(D)20. (2025·天津南开期末)The film shows love to their children.A. parentB. parentsC. parent'sD. parents'DI'm Jack. I'm from the UK, but now I am in China. My 21. family (家人) often go out for a picnic(野餐) on Sundays. We take some apples, bananas, milk 22. and orange juice. My father 23. likes/loves (喜欢) eating bananas. Apples are my 24. mother's (mother) favourite. I like fish. So my father and I go 25. fishing (fish). Then my father gets water and my mother 26. cooks (cook) fish for 27. us (we). And I fly a kite with our dog, Dingding. We 28. sing (sing) some songs. We are all very happy! Ⅳ. 根据短文内容或所给提示填空。family and likes/loves mother's fishing cooks us sing 展开更多...... 收起↑ 资源列表 核心素养综合练.pptx 第1课时 Section A (1a—1d)—Pronunciation.pptx 第2课时 Section A (2a—2e).pptx 第3课时 Grammar Focus (3a—3d).pptx 第4课时 Section B (1a—2b).pptx 第5课时 Project (3a—3c)—Reflecting.pptx 话题写作实境运用.pptx