开心学英语六年级综合复习(精华版)【2020年-2021年最新】

新版开心学英语四年级下册U6练习卷

Class________________ Name _________________ No._________ 一．英汉互译。 1.医生_____________ 2.老师______________ 3.办公室工作人员_______________ 4.nurse______________ 5.student____________ 6.消防员_________________ 7.农民_______________ 8.作家_______________9.出租车司机________________ 10.你是做什么职业的?_________________________ 11.我是一名学生。_____________ 12.他是一名医生。____________________ 二．选择正确的字母补全单词, ( ) 1.f__ __ __fighter A. ire B.eir C.rie ( ) 2.offic__ __ A. er B. or C.ur ( )3. d__ __ver A. ai B. ri C. ei ( )4. stud__ __t A .ea B.en C.eo ( ) 5.t__ __i A. as B. ax C. ex ( ) 6.n__ __se A. ur B. or C.ex ( ) 7.doct__ __ A. or B. ar C. er 三．模仿例句写句子。 Model 1: What do you do? I’m a writer. ____________________________________________________(she/ teacher) ____________________________________________________(Tony/ student) Model 2: Where are you going? I’m going to the park. ___________________________________________________(my friends/ bank) ______________________________________________________(my mother/zoo) 四．看图，补充完整句子，一空一词。（1）（2）（3）（4） 1.A:________ does he do? B: He’s a ___________ ____________. 2.A: Is your father a _____________? B: Yes, he is. 3.A: What _________ he want to _____________? B: He _________to be a __________ ____________. 4.A:___________ she want to be a doctor? B: No, she doesn’t. She wants to be a ______________. A. do/do B. does/do C. does/does 五．根据实际情况回答问题。 1.What are you doing?____________________________________________ 2.What do you want to be?________________________________________

初中英语动词过去式与过去分词表(带音标)(最新整理)

初中常用动词的过去式、过去分词不规则变化的规律一、A—A—A型，即原形、过去式和过去分词三者都相同。（共9个） ⑴cost[k?st]—cost—cost---costing['k?st??]---costs[k?sts vi.价钱为; 花费 ⑵cut[k?t]—cut—cut---cutting['k?t??]---cuts vt. & vi.切, 剪, 割, 削 ⑶hit[hit]—hit—hit---hitting---hits vt. & vi.打, 打击；碰撞vt.伤害, 殃及 ⑷hurt[h?:t]—hurt—hurt---hurting---hurts vt.使受伤; 伤害 ⑸let[let]—let—let ---letting vt.让, 使；放掉, 松掉 ⑹put[put]—put—put---putting vt.放; 置；使处于(某种状态)；表达, 叙述, 说明 ⑺read[ri:d]—read—read ---reading vt. & vi.读; 看懂, 理解 ⑻set[set]—set—set---setting---sets vt.放, 搁置 ⑼shut[??t]—shut—shut ---shutting---shuts vt. & vi.关, 关上二、A—B—B型，即过去式、过去分词相同。（共41个） 1 过去式和过去分词都含有-ought。（3个） ⑴bring[bri?]—brought[br?:t]—brought ---bringing---brings vt.带来, 拿来, 带…到某处, 取来 ⑵buy [bai]— bought [b?:t]—bought ---buying vt. & vi.购买, 购得；做出牺牲以获得 ⑶think [θi?k]—thought [θ?:t]— thought ---thinging vt. & vi.想, 思索；以为; 认为 2 词尾有-ild，-end时，只需把d变为t。（4个） ⑴build [bild]—built [bilt]—built ---building---builds vt. & vi.修建, 建造；开发, 创建 ⑵lend [lend]—lent [lent]— lent---lending vt. & vi.把…借给 ⑶send [send]—sent [sent]—sent ---sending vt.送, 寄; 派遣；使…猛然[迅速]移动 ⑷spend [spend]—spent [spent]— spent ---spending vt. & vi.用钱, 花钱vt.度过; 用尽 3．过去式、过去分词都含有-aught。（2个） ⑴catch [k?t?]—caught [k?:t]—caught ---catching---catches vt.接住；逮住, 抓住；偶然撞见；赶上, 追上；患病;；理解, 听懂, ⑵teach [ti:t?]—taught [t?:t]—taught ---tesching vt. & vi.教 4．把-eep变为-ept。（3个） ⑴keep [ki:p]—kept [kept]—kept---keeping---keeps vt. & vi. & link v.(使)保持; (使)继续 ⑵sleep [sli:p]—slept[slept]—slept ---sleeping---sleeps v.睡眠 ⑶sweep[swi:p]— swept[swept]—swept ---sweeping---sweeps vt. & vi.扫, 打扫, 拂去；扫视 5 把-ell变为-old。（2个） ⑴tell[tel]—told[t??ld]—told ---telling['tel??] vt.讲, 告诉；吩咐, 命令；表明, 显示vt. & vi.分辨, 辨别 ⑵sell[sel]—sold[s??ld]—sold ---selling[‘seli?] vt. & vi.卖; 售; 销 6．过去式、过去分词都含有-elt或-ilt。（4个） ⑴smell[smel]—smelt—smelt---smelling---smells vt.闻到; 嗅出 ⑵spell[spel]—spelt[spelt];spelled—spelt;spelled---spelling vt. & vi.拼写, 拼读 ⑶feel[fi:l]—felt[felt]— felt---feeling vt.触, 摸vt. [感觉到]；觉得, 认为 ⑷spill[spil]—spilt[spilt];spilled—spilt;spilled---spilling vt. & vi.溢出; 泼出7．过去式、过去分词都在原形词尾加t。（3个） ⑴learn[l?:n]—learnt[l?:nt];learned—learnt;learned---learning vt. & vi.学习; 学; 学会；得知; 获悉; 听说 ⑵mean[mi:n]—meant[ment]—meant---meaning vt.表示…的意思；本意是, 原意为; 意味；怀有某目的; 打算； ⑶spoil[sp?il]—spoilt[sp??lt]—spoilt---spoiling---spoils[sp?ilz] vt.损坏; 毁掉；溺爱, 宠坏 8．过去式、过去分词词尾是d。（4个） ⑴say[sei]—said[sed]—said---saying vt. & vi.说; 讲 ⑵pay[pei]—paid[pe?d]—paid---paying vt. & vi.付给; 付款；有利可图; (对…)有利, (对…)值得 ⑶lay[lei]—laid[le?d]—laid---laying vt.放置；压倒, 使躺下, 放倒vt. & vi.生蛋, 产卵 ⑷hear [hi?]—heard [h?:d]—heard---hearing vt. & vi.听到, 听见 9．改变元音字母。（11个） ⑴meet [mi:t]—met [met]—met---meeting vt. & vi.遇见, 碰见, 相见；认识, 结识vt.迎接； ⑵get [ɡet]—got [g?t]—got;gotten ['ɡ?tn]---getting vt.得到, 收到；具有；使得；(去)拿来；vt. & vi.到达,来, 往 ⑶sit [sit]—sat [s?t]—sat---sitting vt. & vi.(使)坐 ⑷find [faind]—found [faund]—found---finding---finds(单三形式) vt.找到, 发现；发觉, 感到 ⑸hold [h?uld]—held [held]—held---holding---holds(单三形式) vt.拿, 抱, 握住；认为, 相信；包含; 容纳 ⑹spit [spit]—spat [sp?t];spitted—spat;spitted---spitting vt. & vi.吐痰; 吐出； ⑺shine [?ain]—shone [???n];shined—shone;shined---shining---shines vi.发光; 反射光; 照耀；表现突出, 出众vt.照射；〈美〉擦亮 ⑻win [win]—won [w?n, w??n]—won---winning---wins vt. & vi.(在…中)获胜, 赢, 战胜(对手) ⑼hang [h??]—hung [h ??]; hanged—hung; hanged ---hanging ['h????] vt. & vi.悬, 挂, 垂下；(被)绞死, 吊死；贴, 固定, 安装 ⑽dig [diɡ]— dug [d?g]—dug vt. & vi.挖, 掘 ⑾lose [lu:z]—lost [l?:st, l?st]—lost vt.遗失; 失去 10．改变辅音字母。（1个） make [meik]—made [me?d]—made---making---makes vt.做; 制造; 被制造；做出, 制定, 产生；使, 使得； 11 改变元、辅音字母。（4个） ⑴leave [li:v]—left [left]—left vt.把…留下; 遗忘；听任, 让；交托, 委托vt. & vi.离去, 离开; 出发; ⑵stand [st?nd]—stood [st?d]—stood---standing---stands vt. & vi.站立, (使)直立, 站着 ⑶have [h?v]—had [h?d]—had---having------has[h?z] (have 的第三人称单数现在式) vt.有；持有，具有；含有；吃；喝 ⑷understand[,?nd?'st?nd]—understood—understood---understanding vt. & vi.懂; 理解三、A—B—C型，即原形、过去式、过去分词都不相同。（共35个） 1 i—a—u变化。（6个） 1

六年级英语上册知识点整理开心学英语

2014年六年级英语上册知识点整理（开心学英语） Unit 1 I wrote a long l一、单词 aandy一块糖； a caam一盒冰激凌； a pa一双袜子； a bag一袋薯条； a bottle of shampoo一瓶洗发水； a bar of soap一块肥皂 a boxues一盒纸巾； a roll of toilet paper一卷手纸 get-got得到，到； bring-brought带到； have/has-had有； find-found发现； buy-bought买二、句子Did you buy a baga? 你在商店买了一袋薯条吗？ No, I didn’t. I bought a bottle of shampoo.不，我没有。我买了一瓶洗发水。 2.Let’s buvelopes andamps.让我们买一些信封和邮票吧。 3.Whagoing to gw?going to get a pa她明天打算买什么？她打算买一双袜子。三、小短day was April 9th. It was my birthday. I had a party. I aubrought a caam. Janet

brougandbrought a bagade a cake. I aake. Then I ate a landy andam. Aar ty, I didn’t feel very well. 2.Tomorrow is oug day! We’re goingBig Blue DepaI’m going to buy a paand a padad’s going to buy a boxuandare going to la new a bottle of shampoo. I like goingg. Unit 2 I usually l一、单词或短语 never从未有时 usually通常 always总是、一直 taubway搭乘地铁 take the bus搭乘公交 taaxi搭乘出租车de my bike骑我的自行车 drive the car开车wall走路去学校 by bus/by bike/by car….by短语放在句尾二、句子 1、How do you gl? I usually take the bus. 2、How dget to work? She usually taubwa、How do they gl? They always wall. 4、Do you ever take a taxl？No, I don’t. I never take a taxl. 5、Here we are. Let’s l、I think we’re lost. But I foundUnit 3 How often do you go hiking? 一、单词及短语一次； twice两次；三次； gg钓鱼； go dancing去跳舞； go hiking去远足； go

广东版开心学英语四年级下册全册教案

Unit 1 My school Target I. Sentences: 1. There’s a hall, a gym···· 2. How many classrooms are there? There are twenty-five classrooms. 3. Of course, Gogo! 4. I have an idea. II. Words: a teachers’ office , a library，a playground, a hall，an art room，a music room, a gym ,a classroom; III. Sounds and words: [u:] room moon cool classroom school noodles Materials Picture Cards 1-8, a teachers’ office , a library，a playground, a hall，an art room，a music room, a gym ,a classroom;

The first period Step 1 Review 1. Do you know…? 2. How many words do you know? Step 2 V ocabulary Getting ready Put Picture Cards 1-8 on the blackboard. T: Look at the Picture Cards. Say each word as you hold up the Picture Cards T: Now listen and repeat. Hold up each Picture cards. And say the word. Give Ss time to repeat. Using the book T: Listen to the disc and repeat. Point to each subject as you say it. Play the disc and have Ss repeat each word. T: Is this an art room? (Point to a music room Picture card.) Ss: No, it isn’t. It’s a music room. Model if necessary. Repeat with several Picture Cards. T: Close your books. T: (Hold up various Picture Cards and repeat.) what is it? Ss: It’s a …. Extension activity Step 3 Practice 2 T: What can you see? (S1:A gym```) T: Now read the questions. Have Ss read the questions together.

整理：动词过去式和过去分词的变化规则

整理：动词过去式和过去分词的变化规则动词过去式和过去分词有规则变化和不规则变化两种。 Ⅰ. 规则变化: 1. 一般情况直接加ed，如ask—asked, work—worked 2. 以不发音的e结尾，只加d，如love—loved, dance—danced 3. 以辅音字母加y结尾，把y变为i，再加ed，如try—tried, study—studied 4. 以一个元音字母和一个辅音结尾的重读闭音节结尾的动词(以重读闭音节或r音节结尾而末尾只有一个辅音字母),先双写末尾这个辅音字母,再加ed,如stop—stopped, permit—permitted II.不规则动词表: (1) AAA型（动词原形、过去式、过去分词同形） cost（花费）cost cost shut shutshut cut（割）cut cut spit spit/spat spit/ spat(英) hit（打）hit hit hurt 伤害）hurt hurt let（让）let let put（放）put put read （读）read read (2) AAB型（动词原形与过去式同形） beat（跳动）beat beaten (3) ABA型（动词原形与过去分词同形） become（变成）became become awake awoke awoken come（来）came come run（跑）ran run (4) ABB型（过去式与过去分词同形） dig（挖）dug dug build built built get（得到）got got/gotten catch caught caught hang（吊死）hanged hanged deal dealt dealt hang（悬挂）hung hung feed fed fed hold（抓住）held held find found found shine（照耀）shone shone forbid forbade/forbad forbidden sit（坐）sat sat pay paid paid win （赢）won won send sent sent meet（遇见）met met shoot shot shot keep （保持）kept kept tell told told

开心学英语六年级上册期末试卷

2012年六年级秋季班期末试卷校区 _________ 姓名 _____________ 得分 ____________________ A 卷选择题部分（60分） —— ?、辩音。选取与所给单词划线部分读音不冋的单词。 (5 分) ( )1. seat A . tea B. meat C. weather D. beach ( )2. bad A. back B. fast C. have D. map ( )3. park A. warm B. garde n C. market D . party ( )4.food A. school B. tooth C. choose D.good ( )5.throw A. Thursday B.jhen C. with D. other _ 、选择填空。（30 分） ( )1. There is a ? x 1 “ ” and y in -ray” word a x A. a; an;/ B. an; a; the C. a; an; the D. a ; an; / ( )2. These are shoes, are over there. A. I; you B. my; you C. mine; yours D. my; yours ( )3. ------- I s it the twins ' bedroom? ----- Y es, it is. It is ________ bedroom. A. Lucy and Lily ' Bs Lucy ' s and Lily C. Lucy ' s and Lily D. Isucy and Lily ( )4. Let ' s the farmers __________ the apples on the farm. A. help to; pick ing B. help; pick C. to help; to pick D. help ing; count ( )5. My aunt _____ a roll of toilet paper yesterday. A. get B. gets C. got D. gots ( )6. We _____ go to school from Mon day to Friday. A. n ever B. sometimes C. always D. ofte n ( )7. It will be ________ than before. A. good B. better C. nice D. well ( )8. Mary was very _______ to get the prese nt from her pare nts. A. excite B. excit ing C. an excit ing D. excited ( )9. We live _____ the world. A. in B. on C. at D. un der ( )10.—— ____ does he go to the place? -------- He always rides a bike.

新版开心学英语四年级下册练习题

四年级英语下册练习卷(一） Class:______________Name:___________________No._________________ 一、选择正确的字母补全单词。 ()1.sh____tsA.arB.erC.or ()2.wh__s__A.o/eB.o/eC.e/o ()3.t__x__dr__verA.e/i/aB.a/e/iC.a/i/i ()4.sw____terA.eiB.aeC.ea ()5.s____oolA.chB.shC.th ()6.par____A.thB.ayC.ty 二、选词填空。（Maybathroomsdriversweaterdoesdoctorbe） 1.Gogowantsto__________afirefighter. 2.Isyourfatherataxi______________?No,heisn’t. 3.Howmany____________arethereinhisnewhome? 4.The____________issonice.__________Ibuyit? 5.What________hewanttobe?Hewantstobea____________. 三、模仿例句写句子。 ModuleA:Doyouwanttoseeamovie?Yes,Ido. 1.they/playtheguitar/yes _____________________________________________________________________ 2.he/gotothebeach/yes _____________________________________________________________________ 3.Mr.Li/studymath/no _____________________________________________________________________ ModuleB:Isshegoingtothebeach?Yes,sheis. 1.they/bank/no _____________________________________________________________________ 2.you/supermarket/yes _____________________________________________________________________ 3.Benandhisfriend/restaurant/yes _____________________________________________________________________ 四、根据下面的中文，完成句子，每空一词。(缩写算一空)

动词原形,过去式,过去分词整理。

A---A---A型（现在式、过去式和过去分词同形）动词原形（现在式）过去式过去分词 cost cost cost 花费 cut cut cut 割，切 hit hit hit 打 let let let 让 put put put 放下 read read read 读 hurt hurt hurt 伤 shut --- shut --- shut set -- set --- set 2. A---A---B型（现在式和过去式同形） beat beat beaten 打 3. A---B---A型（现在式和过去分词同形） come came come 来 become became become 变 run ran run 跑 4. A---B ---B 型（1）在动词原形后加一个辅音字母d或t构成过去式或过去分词burn burnt burnt 燃烧 learn learned/learnt learned/learnt 学习

mean meant meant 意思 hear heard heard 听见 (2)把动词原形的最后一个辅音字母“c改为“t构成过去式或过去分词 build built built 建筑 lenc lent lent 借给 lose lost lost 失去 send sent sent 送 spe nd spe nt spe nt 花费 ( 3)其他 pay paid paid 付 lay laid laid 下蛋 say said said说 bring brought brought 带来 buy bought bought 买 think thought thought 想 sleep slept slept 睡 keep kept kept 保持 sweep swept swept 扫 stand stood stood 站 understand understood understood 明白

开心版英语六年级上册各单元学习重点

Unit 1 Feeling Sick 感觉不舒服句子详解： 1. What’s wrong with you 你怎么了 “What’s wrong with…”意思是“......怎么了”用来询问身体或精神状态，也可以用来询问突发事件，表示关心或问候。同义句是“What’s the matter with…” with是介词，后面要加名词或代词的宾格形式。如： ---“What’s wrong with your mother 你妈妈怎么了 ---She hurts her hand. 她伤着手了。 2. You should see the doctor. 你应该看医生。 should 是情态动词，没有人称和数的变化，后面加动词原形，句型结构：（1）肯定句：主语+ should +动词原形+其他。（2）否定句：主语+ shouldn’t + 动词原形+其他。（3）一般疑问句：Should + 主语+ 动词原形 + 其他 He should stay in bed. He shouldn’t stay in bed.

Should he stay in bed Unit 2 Looking for a hospital 找医院句子详解： 1. Excuse me.对不起/打扰了/请原谅。【辨析】Excuse me. 与Sorry. “Excuse me. ”和“Sorry.”是日常会话中使用频率较高的口语，它们都可译为“对不起”。“Excuse me. ”用来引起别人注意，也可表示礼貌，意为“对不起；请问；打扰了；劳驾”等，它是在给别人添麻烦之前说的话，是最普通的道歉用语。“Sorry.”（=“I’m sorry.”通常用于表示由于某种过失或办不成某事的一种歉意。 ’s the hospital医院在哪里 Where 意思是“在哪里”，常用来询问位置或地点。当我们想要去某地却不知道地点时可以用句型“Where’s+ 地点”来询问，回答时通常用“It’s +位置介词+参照地点.”如： ---Where is the bookstore ---It’s next to the post office.

新版开心学英语四年级下册U1-3练习题

四年级英语下册Unit1（1） Class________________ Name _________________ No.______________ 一、选择正确的字母补全单词,并写出中文。 ( ) 1. h_ll A. a B. e C. i __________________ ( ) 2.t_ _ A. ee B. aa C. oo _________________ ( ) 3. th_r_ is A. e,a B. e,e C. e,o _________________ ( ) 4._dea A.. a B. i C. e __________________ ( ) 5. gy_ A. n B. a C. m __________________ ( )6. cour_ _ A. ce B. me C. se _________________ 二、看图完成句子，一空一词。（1）（2）（3） 1.____________she dancing? No, she ________. She’s _________________. 2.How _________chairs are there? __________ are ______________. 3.What’s in your school? There’s a ___________________. 三、选择题。 ( )1、你想告诉妈妈：你们学校没有一个饭堂，可以说： t a lunch room. C. There’s a lunch room. A．There isn’t a hall. B. There isn’ ( )2. 朋友想邀请你去他们的学校，他会说： A. Go to school with us. B. Do you like school? C. Go to school. ( ) 3. Lisa想知道你学校里有什么，她会问： A. Is there a hall in your school? B. There are twelve classroom. C. What’s in your school? ( ) 4. Ben想知道你学校有多少间图书馆，他会问： A. How many classrooms are there? B. How many library are there? C. How many libraries are there? ( ) 5. 妈妈问你学校有几间教室时，你回答： A. There’re twelve classrooms. B. How many classrooms are there? C. Are there twelve classrooms.

(完整版)朗文字典-过去式-过去分词-总表-大全-汇总-集锦-秘籍

abide abided, abode abided arise arose arisen awake awoke, awaked awoken be am was been is are were bear bore borne beat beat beat, beaten become became become befall befell befallen beget begot, begat [圣经] begotten begin began begun behold beheld beheld bend bent bent bereave bereft, bereaved bereft, bereaved beseech besought, beseeched besought, beseeched beset beset beset bestride bestrode bestridden bet bet, betted bet, betted betake betook betaken bethink bethought bethought bid bade, bid bid, bidden bind bound bound bite bit bitten bleed bled bled bless blessed, blest blessed, blest blow blew blown break broke broken breed bred bred bring brought brought broadcast broadcast broadcast build built built burn burned, burnt burned, burnt burst burst burst buy bought bought can能够could 无 can封装罐头canned canned cast cast cast catch caught caught chide chided, chid chid, chidden choose chose chosen cleave cleaved, cleft, clove cleaved, cleft, cloven

(完整)最新版-广东版-开心学英语-六年级上册-期末综合卷

六年级英语水平测试卷第1页共4页六年级英语水平测试卷第2页共4页 2015—2016学年度上学期小学六年级英语水平测试卷（综合） Listening 听力部分 45% 一、Listen and tick.听录音,在括号里打“√”。（每题1.5分,共15分） 1. ( ) headache 2. ( ) purse 3. ( ) short 4. ( ) forty 5. ( ) food ( ) toothache ( ) nurse ( ) sport ( ) fifty ( ) foot 6. ( ) sweater 7. ( ) cool 8. ( ) this 9. ( ) were 10. ( ) watch ( ) weather ( ) cold ( ) these ( ) where ( ) wash 二、Listen and write.听对话,将图片编号填在括号内。（每题1.5分,共9分） ( ) 1. A B ( ) 2. A B ( ) 3. A B ( ) 4. A B ( ) 5. A B ( ) 6. A B 三、Listen and tick.听短文,在表格内打“√”。（每空1.5分,共7.5分） Names plenty of vegetables ice cream go jogging drink water drink cola Lisa Peter 四、Listen and choose.听短文,选出最佳答案。（每题1.5分,共6分） ( ) 1. Where was Jenny yesterday? A. At home. B. At school. C. At the Tree Planting Camp. ( ) 2. What did Jenny do? A. Watched TV . B. Planted trees. C. Painted a picture. ( ) 3. Where was Ben yesterday? A. At home. B. At school. C. At the Tree Planting Camp. ( ) 4. What did Ben do in the morning? A. Helped his mother. B. Watched TV . C. Painted a picture. 五、Listen and judge.听短文,对的写“T”,错的写“F”。（每题1.5分,共7.5分） ( ) 1. I was at the park in the morning. ( ) 2. My shoes were very dirty before. ( ) 3. I played basketball with my friends in the afternoon. ( ) 4. I watched TV in the evening. ( ) 5. Yesterday was Sunday. Reading & Writing 读写部分55% tidy, sleep, cooked dinner, headache, dirty, Canada, watched TV , stomachache fever, vegetables, exercise, messy, listened to music, Thailand, Zhongshan, 1. I feel sick. I have a cold. A. ____________________ B. ____________________ C._______________________ 2. Enough water is good for your health. A. ____________________ B. ____________________ C._______________________ 3. My bedroom was clean this morning. A. ____________________ B. ____________________ C._______________________ 4. What did you do yesterday?---- I planted trees. A. ____________________ B. ____________________ C._______________________ 5. Where were you last month? ---- I was in Guangzhou. A._____________________ B. ____________________ C._______________________ 七、Choose the best answer.选择最佳答案。（每题1分,共4分） ( ) 1. What can trees do? ---They can __________. A. clean the air B. clean the soil C. clean the animals ( ) 2. --- Animals need sun, air, and ________. A. fruit B. water C. money ( ) 3. When ’s Tree Planting Day? --- It's on ________. A. October 1st . B. September 10th . C. March 12th . ( ) 4. _________ is good for our health. A. Dirty air B. Clean air C. Plastic bags 学校班级姓名考号