外研版2025届高考英语一轮复习教材知识复习Unit2ExploringEnglish必修第一册课件

这是一份外研版2025届高考英语一轮复习教材知识复习Unit2ExploringEnglish必修第一册课件，共60页。PPT课件主要包含了 强基础 语基自测， 研考点 核心突破，目录索引 ， 测效果 课堂评价， 研真题 链接高考，contacted　，resources　，reminded　，titled，behave等内容，欢迎下载使用。
一、核心单词1.　　　　　　 adj.独一无二的,独特的 2.　　　　　　 v.联系,联络 3.　　　　　　 n.上下文,语境 4.　　　　　　 n.题目,标题　v.加标题;为……加上题目 5.　　　　　　 n.资料,(教学)资源 6.　　　　　　 v.提醒,使……想起 7.　　　　　　 adj.消极的,负面的 8.　　　　　　 n.错误,谬误 
unique　cntact　cntext　title　resurce　remindnegative　errr
Ⅰ.用所给单词的适当形式填空1.She sent me t the hspital in time and 　　　　　　(cntact) my family. 2.We all feel wrried when seeing all kinds f 　　　　　　(resurce),such as paper,water,electricity and fd,wasted n campus. 3.As a traditinal Chinese festival,Tmb-Sweeping Day keeps us___________ 　　　　　　(remind) f ur lst families and cherishing the living nes. 4.Last Saturday,I just visited an exhibitin 　　　　　　(title) “Meeting Artists” held by ur city’s museum. 
二、派生单词1.　　　　　　 v.举止→　　　　　　 n.举止,行为 2.　　　　　　 v.使……困惑→　　　　　　 adj.令人困惑的→　　　　　　 adj.困惑的→　　　　　　 n.困惑 3.　　　　　　 v.显示,反映→　　　　　　 n.反映;映像;沉思→　　　　　　 adj.反射的;反映的;沉思的 4.　　　　　　 v.创造→　　　　　　 adj.创造(性)的→　　　　　　 n.创造性,创造力→　　　　　　 n.创造,创作 5.　　　　　　 v.组织→　　　　　　 n.组织,团体,机构→　　　　　　 adj.有组织的,有条理的 
reflective　
6.　　　　　 vt.增加;添加;补充说→　　　　　 n.增加物,添加物→　　　　　　 adj.附加的;另外的 7.　　　　　　 v.计划,打算→　　　　　　 n.意图,目的 
8.　　　　　　 v.认识,辨认出→　　　　　　 n.识别,承认,认出 9.　　　　　　 v.以……为基础→　　　　　　 adj.基础的,基本的→　　　　　 n.基础;底部 10.　　　　　　 adj.意识到的,明白的→　　　　　　 n.意识 
Ⅱ.用所给词的适当形式填空1.He was really 　　　　　　by the 　　　　　　prblem which als 　　　　　　ther peple fr a lng time.(cnfuse) 2.The rich man went abrad with the 　　　　　　f trying his frtune,while the pr man 　　　　　　t learn sme skills f earning mney.(intend) 3.I carried the small lantern and walked arund the river.The light was 　　　　　　in the river and the 　　　　　　lked s beautiful.(reflect) 4.The child 　　　　　　s well in class that the teacher praised his gd 　　　　　　　in frnt f thers.(behave) 
5.Experts and psychlgists have been 　　　　　　f the prblem f phne addictin s they will wrk hard t increase public 　　　　　　abut this prblem.(aware) 6.The yung man 　　　　　　a machine with his 　　　　　　and thus he was cnsidered t be a 　　　　　　persn.(create) 
7.We 　　　　　　ur thery n the 　　　　　　f practice,cnsidering sme 　　　　　　factrs.(base) 8.He jined the 　　　　　　which was 　　　　　　by Mandela as sn as it was set up.(rganize) 
三、重点短语1.　　　　　　　　　　　　说到;谈及 2.　　　　　　　　　 偶然发现3.　　　　　　　　　 把……称作,把……当作4.　　　　　　　　　 令某人惊讶的是5.　　　　　　　　　 意识到,察觉到6.　　 　　　　　　　 (尤因喉咙痛)说话困难7.　　　　　　　　　 谨慎行事,避免冒险8.　　　　　　　　　 给(机械)上发条;使(活动、会议等)结束
speaking f　cme acrss　refer 　t ne’s astnishment　be aware f　have a frg in ne’s thrat　play safe　wind up
Ⅲ.用左栏所给短语的正确形式填空1.　　　　　　　　　 table manners,keep yur vice lw during the meal. 2.It was when I gt back t my apartment that I first 　　　　　　　　　my new neighbrs. 3.If we all agree,let’s 　　　　　　　　　the discussin. 4.Let’s 　　　　　　　　　and make enugh preparatins.I dn’t want t take risks. 5.We 　　　　　　　　the ptential prblems and have taken sme preventive measures. 
Speaking f　
came acrss　
are aware f
四、典型句式既不……也不……教材原句:Neither is there pine nr apple in is why...那就是……的原因。教材原句:That is why when the stars are ut,they are visible,but when the lights are ut,they are als...“不但……而且……”
教材原句:Nt nly can yu pst specific questins,but yu can als braden yur knwledge by reading psts frm ther English learners arund the wrld.
Ⅳ.微写作1.众所周知,青岛是一个非常美丽的城市,一年四季既不太热也不太冷。As is knwn t us,Qingda is a very beautiful city,　　　　　　　　　　　　　　　　　　 all year rund. 2.世界已变成了一个地球村,那就是越来越多的人对学英语感兴趣的原因。The wrld has becme a glbal village.　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　. 
which is neither t ht nr t cld　
That’s why mre and mre peple are interested in learning English　
3.最近,一个重要的排球比赛将在我们的校园举行,这不仅有意义,而且令人兴奋。Recently,an imprtant vlleyball game will be held in ur campus,which will 　　　　　　　　　　　　　　　　　　　　　　　　　　. 
be nt nly meaningful but als exciting
1.cnfusing adj.令人困惑的→cnfused adj.困惑的,糊涂的;不清楚的→cnfusin n.混乱;困惑
【练会】单句语法填空①(2023新高考全国Ⅰ卷)As fr Bailey,she is mre 　　　　　　(cnfuse) abut why her act is cnsidered a big deal②Many beginners f English learning always cnfuse the wrd “weather” 　　　　　　“whether”. ③The wman lked at him in 　　　　　　(cnfuse) and said smething abut changing her clthes. 
【写美】微写作·背诵④躲在她的裙子后面的是一个小女孩,她盯着镜头,睁大了眼睛,充满了困惑和恐惧。(读后续写之外貌+情绪描写)
Hiding behind her skirt was a tiny girl wh stared int the camera,　　　　　　　　　　　　　　　　　　　.(独立主格结构) 
wide eyes with cnfusin and fear
归纳 (1)cnfuse A with/and B将A和B混淆(2)be/get cnfused abut/at对……感到困惑点津 v.-ing形式的形容词表示“事物”的性质和特征,意为“令人……的”;v.-ed形式的形容词往往表示“人”所处的状态,常用来描述人,意为“感到……的”。另外,修饰face,lk,expressin,vice等时,常用v.-ed形式的形容词。
2.remind v.提醒,使……想起→reminder n.引起回忆的事物
【练会】单句语法填空①As my eyes landed nt the bread n the kitchen table,I was reminded 　　　　　　thse sweet childhd memries.②This precius gift served as a cnstant 　　　　　　(remind) f learning t use my tl right. 
as引导时间状语从句
【写美】微写作·背诵③我站起来时提醒自己要呼吸,汗水顺着脖子后面流了下来。(读后续写之紧张)　
I 　　　　　　　　　　　　　　　as I std up,with sweat streaming dwn the back f my neck. 
reminded myself t breathe
归纳 remind sb f (ding) sth提醒某人(做)某事remind sb that...使某人想起……remind sb t d sth提醒某人做某事联想 常见“v.+sb+f sth”的短语:infrm sb f sth通知某人某事rb sb f sth抢劫某人某物warn sb f sth警告某人某事cnvince sb f sth使某人相信某事suspect sb f sth怀疑某人某事
3.cmment n.评论,评价　v.评论;议论;发表意见
【练会】单句语法填空①(2023浙江1月卷)As yu make yur lifestyle changes,yu may find yurself wanting t speak up fr yurself if thers cmment 　　　　　what yu’re ding. ②The fficer,wearing a dubtful lk,ffered n 　　　　　　(cmment). 
find+宾语+宾语补足语
【写美】一句多译·背诵③期望您能做一个开场白和一个结束语,并对演讲者做一些简短的评论。(应用文之邀请信)→Yu are expected t give bth an pening speech and a clsing ne,and 　 　　　　　　　　　　　　　　　　　.(n.cmment) →Yu are expected t give bth an pening speech and a clsing ne, and 　　　　 　　　　　　　　　　　　　　　　.(v.cmment) 
make sme brief cmments n the speakers
briefly cmment n the speakers
归纳 (1)make a cmment/cmments n 对……作出评论(2)cmment n...对……评论cmment that...评论……
While viewing thse heartfelt cmments,I realized that the  gd deed was paid frward!(读后续写之善行)
前没有冠词,用复数形式
当我看到那些发自内心的评论时,我意识到这一善行是有回报的!
4.intend v.计划,打算→intentin n.意图;目的;打算
【练会】单句语法填空①My parents 　　　　　　　　　(intend) t buy a new truck but culdn’t affrd it. ②(2022新高考全国Ⅰ卷)The GPNP is intended ___________________　　　　　　　　　　　(prvide) strnger prtectin fr all the species. ③(2023全国甲卷)Behind the simple style,hwever,is a serius message 　　　　　　(intend) fr everyne. 
had intended
t prvide/prviding
【写美】微写作·背诵④英文报Yuth中的许多专栏是专门为高中生设计的,旨在丰富他们单调的校园生活。Many clumns f the English newspaper Yuth ________________________　　　　　　　　　　　　　　　　　　senir high schl students 　　　　　　　　　　　　　　　enriching their bring campus life. 
are specially intended fr
with the intentin f
归纳 (1)intend t d/ding sth打算做某事(2)be intended fr sth/t d sth为……打算(或设计)的;目的是做……(3)had intended t d sth本打算做某事但没有做成(4)with an/the intentin f打算……点津 intend,mean,hpe,want,plan,suppse,expect,think等动词的过去完成时可用来表示一件本来打算做而实际上没有做的事或者表示过去未曾实现的设想或愿望,含有某种惋惜之意。
5.base v.以……为基础　n.底部;根据→basis n.基础;基本原则→basic adj.基本的;基础的
【练会】单句语法填空①Candidates will be matched with a task based 　　　　　　skill set. ②On the 　　　　　　(base) f what yu shw,I firmly believe that yu can be qualified fr the psitin. ③We learned the 　　　　　　(base) skills f rescuing animals in varius situatins. 
【写美】微写作·背诵④我汗流浃背,几乎要哭了,根据父母和杰森不断的笑声,我可以想象那一刻我是多么愚蠢和奇怪。(读后续写之情绪描写)
Sweating and nearly tearing,I culd imagine hw silly and strange I was at that mment 　　　　　　　　　　　　　　　　　　　　frm my parents and Jasn. 
based n the cntinuing laughter
归纳 (1)把……建立在……基础之上be based n/upn以……为基础;依据……(2)n the basis f在……基础上;基于……佳句 In my pinin,cmmn hbbies are the basis f making friends.(应用文之建议信)在我看来,共同的爱好是交朋友的基础。
6.cme acrss 偶然发现
【练会】用cme短语填空①Abve all,tell me hw the accident 　　　　　　　　　immediately. ②My assistant’s first nvel 　　　　　　　　　　,which made me prud f him. ③Aware that my partner 　　　　　　　　　　　　a serius disease,I had knts in my thrat and rushed t hspital anxiusly. 
(因害怕、激动等而)喉咙发紧
came dwn with　
【写美】 微写作·背诵④说到英语学习,我有以下实用的建议与大家分享。首先,当你遇到不熟悉的单词时,不要总是查字典。此外,当老师在课堂上提出问题时,你应该试着想出答案。最后,如果你失败了,你必须对自己说:“加油!”(应用文之建议信)　　　　　　　　　　　　 English learning,I have the fllwing practical suggestins t share.Firstly,when yu 　　　　　　　　　unfamiliar wrds,dn’t always refer t the dictinary.Besides,when teachers’ questins 　　　　　　in class,yu shuld try t 　　　　　　　　answers.Lastly,if yu fail,yu must say t yurself,“　　　　　　　　　!” 
When it cmes t
cme up with
归纳 cme ut出现;出版;(花)开放;结果是cme abut发生cme up发生,出现,走近;被提出cme up with提出;想出cme n加油;到来;得了吧cme dwn (with...)染上;得了(……病);患(病)when it cmes t (ding) sth当谈及(做)某事佳句 My brain went blank when I came acrss a difficult questin during the exam.(读后续写之心理描写)考试碰到一道难题时,我的脑子一片空白。
7.be/becme aware f 意识到,觉察到
【练会】单句语法填空①The activity,the aim f which is t draw ur attentin t envirnmental prtectin,raises ur 　　　　　　(aware) f caring abut nature. ②She was aware 　　　　　　schl life cnsists f nt nly happiness but als hard times. 
【写美】 微写作· 背诵③野狼的嚎叫吓得我尖叫起来,我不知道如何缓解这无法抗拒的恐惧。(读后续写之恐惧描写)The rar f the wild wlf panicked me int screaming,and I _______________　　　　　　　　　　　hw t ease the verwhelming panic. 
wasn’t aware f
归纳 (1)aware adj.知道的;有……意识的be aware+that...意识到……(2)awareness n.意识;认识;觉悟raise ne’s awareness f提高某人的……意识佳句 She ran t her mm and hugged her tightly as well,fully aware f her mm’s lve.(读后续写之动作描写)她跑向妈妈,也紧紧地拥抱着妈妈,充分感受到了妈妈的爱。
★补遗缺　微点练全Ⅰ.一词多义1.reflect
A.v.思考　B.v.反射　C.v.反映,显示
①When the sun’s rays hit the earth,a lt f the heat is reflected back int space.　　 ②The manager demanded time t reflect n what t d.　　 ③The statistics reflect a change in peple’s spending habits.　　 
A.n.一套住房　B.adj.无趣的　C.adj.平坦的　D.adj.(轮胎或球)瘪了的,撒了气的 E.adj.断然的
①Much f the cuntryside in that regin is very flat.　　 ②After the excitement f the party,life seems smewhat flat nw.　　 ③I gt a flat tyre after driving ver a nail.　　 ④Her request was met with a flat refusal.　　 ⑤They have a huse in the cuntry and a flat in Manchester.　　 
Ⅱ.教材熟词生义1.title
(体育比赛的)第一名,冠军　
2.entrance
大门(口),入口(处)
1.That/This/It is why...那/这是……的原因。
[教材原句] That is why when the stars are ut,they are visible,but when the lights are ut,they are invisible.那就是为什么星星出来的时候是看得见的,而灯灭了的时候是看不见的。
【练会】单句语法填空①He verslept and gt up t late this mrning and that was 　　　　　　he missed the train. 
【写美】同义句转换·背诵②Mre and mre peple like t travel and even t live in Kunming.That’s because it is neither ht in summer,nr t cld in winter.→Kunming is neither ht in summer,nr t cld in winter.____________　　　　　　　　　 mre and mre peple like t travel and even t live there. →　　　　　　　　　　　　 mre and mre peple like t travel and even t live in Kunming 　　　　　　　　　it is neither ht in summer,nr t cld in winter. 
The reasn why
归纳 That/This/It is why...是一个常用句型,意为“那/这是……的原因”,其中why引导表语从句,表示结果。(1)That/This/It is because...那是/这是因为……(because引导表语从句,表示原因)(2)The reasn fr (ding) that...……的原因是……(why引导定语从句,that引导表语从句,表示原因)
2.nt als...“不但……而且……”,连接并列成分
[教材原句] Nt nly can yu pst specific questins,but yu can als braden yur knwledge by reading psts frm ther English learners arund the wrld.你不仅能发帖问具体的问题,而且还能通过阅读世界各地的其他英语学习者的帖子拓宽你的知识面。
【练会】单句语法填空①Nt nly 　　　　　　I appreciate lts f beautiful scenery during this jurney,but als I learned a lt abut the custms f the places I travelled t. ②Nt nly the freign students but als the teacher __________________　　　　　　　　　(attract) by the authentic Chinese tea culture s far. 
过去式也可直接加-ed
【写美】句式升级·背诵③The ceans nt nly prvide us with abundant resurces,but they als play a rle in maintaining the balance f ur ecsystem.→　　　　　　　　　　　　　　　　　　　　　　　　　,but they als play a rle in maintaining the balance f ur ecsystem.(倒装) 
has been attracted
Nt nly d the ceans prvide us with abundant resurces
归纳 (1)用于连接两个表示并列关系的成分,着重强调后者,意为“不仅……而且……”;als可以省略。(2)若连接两个句子,且nt nly位于句首时,nt nly后面的句子要用部分倒装。(3)若连接的两个成分作主语,其谓语通常与靠近的主语保持一致。佳句 Beijing is nt nly the plitical center but als the ecnmic center f ur cuntry.(应用文之景点介绍)北京不仅是我国的政治中心,也是我国的经济中心。
Ⅰ.单句语法填空——分层级强化高频考点
A组　基础必练1.The key t becming a jurnalist is wrk experience,perseverance and 　　　　　　(create) thinking. 2.T avid 　　　　　　(cnfuse),all the students are required t write their names n their glasses. 3.The bk was written n the 　　　　　　(base) f careful bservatins and detailed studies. 4.If yur explanatin fails t meet my requirements,I intend _____________　　　　　　　(apply) fr return. 5.It seems like peple need t be mre aware 　　　　　　the imprtance f wildlife. 
B组　高考链接6.(2023全国甲卷)Thse tmates had a taste that reminded me 　　　　the nes my uncle used t grw when I was a child. 7.(2023浙江1月卷)I came back with my first jars f zer waste grceries,and my dad 　　　　　　(cmment) n hw silly it was fr me t carry jars everywhere. 8.(2023新高考全国Ⅱ卷)They als need t be ready t give interviews in English with internatinal jurnalists.This is 　　　　　　　they need an English trainer. 
9.(2022全国甲卷)The disagreement was s sharp that neither he ___________　　　　　　I knew hw t settle it. 10.(2022新高考全国Ⅰ卷) 　　 　　　　(additinal),frm time t time I will assign grup wrk t be cmpleted in class r shrt assignments t be cmpleted at hme,bth f which will be graded. 
Additinally
Ⅱ.语篇填空——语境中应用单元要点
It’s recgnized 1.　　　　　 having a gd cmmand f English becmes increasingly vital.Nw,I’ll share sme advice with yu in learning English. Develp gd learning habits.Cnsult the dictinary when cming 2.______　　　　　　 new wrds and remind yurself 3.　　　　　　　　 (reflect) n/upn yur errrs when in truble. Turn t thers fr help.Everyne will get 4.　　　　　　(cnfuse) smetimes.When yu find it hard fr yu t slve a prblem by yurself,dn’t hesitate t turn t smene fr help.5.　　　　　　(additin),by exchanging yur ideas with thers,yu’re mre likely 6.　　　　　　　(have) a better understanding. 
Additinally　
Never give up.Learning is like a jurney.Yu shuld knw that yu intend 7.　　　　　　　(learn) it well.Keep in mind the famus saying,“Where there is a will,there is a way.” S hang n until yu succeed! 
Ⅲ.话题微写作——场景中提升写作技能(黑体部分用本单元词汇表达)
应用文写作——语言学习第一步　单句写作1.英语是人发明的,而不是电脑,它反映了人类的创造力。(reflect,creativity)English was invented by peple,nt cmputers,and it 　　　　　　 　　　　　　　　　　. 2.说到学习英语,一开始你可能会遇到很多不熟悉的单词。(speaking f,cme acrss,unfamiliar)　　　　 　　　　　　,yu may______________________________ 　　　　　　　　　　　　　　　　　　at first. 
reflects the creativity f the human race　
Speaking f learning English
cme acrss a lt f unfamiliar wrds　
3.你在英语学习中使用语法可能会有困难。(likely,have truble ding)Yu 　　　　　　　　　　　　　　　　　　　　　　　　in English learning. 4.只有克服困难,你才能学好英语。(倒装句)Only by vercming the difficulties 　　　　　　　　　　　　　　　　. 
are likely t have truble using grammar　
can yu learn English well
第二步　句式升级5.用非限制性定语从句升级句1第三步　连句成篇(注意使用恰当的衔接词)
English was invented by peple,nt cmputers,which reflects the creativity f the human race.
English was invented by peple,nt cmputers,which reflects the creativity f the human race.Speaking f learning English,yu may cme acrss a lt f unfamiliar wrds at first.What’s mre,yu are likely t have truble using grammar in English learning.Only by vercming the difficulties can yu learn English well.
(2023新高考全国Ⅰ卷,阅读B)——介绍环境保护发明家Jhn TddWhen Jhn Tdd was a child,he lved t explre the wds arund his huse,bserving hw nature slved prblems.A dirty stream,fr example,ften became clear after flwing thrugh plants and alng rcks where tiny creatures lived.When he gt lder,Jhn started t wnder if this prcess culd be used t clean up the messes peple were making.After studying agriculture,medicine,and fisheries in cllege,Jhn went back t bserving nature and asking questins.Why can certain plants trap harmful bacteria(细菌)?Which kinds f fish can eat cancer-causing chemicals?With the right cmbinatin f animals and plants,he figured,maybe he culd clean up waste the way nature did.He decided t build what he wuld later call an ec-machine.
The task Jhn set fr himself was t remve harmful substances frm sme sludge(污泥).First,he cnstructed a series f clear fiberglass tanks cnnected t each ther.Then he went arund t lcal pnds and streams and brught back sme plants and animals.He placed them in the tanks and waited.Little by little,these different kinds f life gt used t ne anther and frmed their wn ecsystem.After a few weeks,Jhn added the sludge.He was amazed at the results.The plants and animals in the ec-machine tk the sludge as fd and began t eat it!Within weeks,it had all been digested,and all that was left was pure water.
Over the years,Jhn has taken n many big jbs.He develped a greenhuse-like facility that treated sewage(污水) frm 1,600 hmes in Suth Burlingtn.He als designed an ec-machine t clean canal water in Fuzhu,a city in sutheast China.“Eclgical design” is the name Jhn gives t what he des.“Life n Earth is kind f a bx f spare parts fr the inventr,” he says.“Yu put rganisms in new relatinships and bserve what’s happening.Then yu let these new systems develp their wn ways t self-repair.”
二、真题再做24.What can we learn abut Jhn frm the first tw paragraphs?A.He was fnd f traveling.B.He enjyed being had an inquiring mind.D.He lnged t be a dctr.
答案 C　解析 推理判断题。根据第一段中的“When Jhn Tdd was a child,he lved t explre the wds arund his huse,bserving hw nature slved prblems.”和“When he gt lder,Jhn started t wnder if this prcess culd be used t clean up the messes peple were making.”以及第二段中他提问的一系列问题可推知,Jhn是一个爱探索、好问问题的人。故选C项。
25.Why did Jhn put the sludge int the tanks?A.T feed the build an prtect the test the ec-machine.
答案 D　解析 推理判断题。根据第四段中的“He was amazed at the results.The plants and animals in the ec-machine tk the sludge as fd and began t eat it!”可知,Jhn 把污泥放进水槽里是为了对“生态机器”进行测试。故选D项。
26.What is the authr’s purpse in mentining Fuzhu?A.T review Jhn’s research shw an applicatin f Jhn’s cmpare Jhn’s different erase dubts abut Jhn’s inventin.
答案 B　解析 推理判断题。根据倒数第二段中的“He als designed an ec-machine t clean canal water in Fuzhu,a city in sutheast China.”可知,作者提到福州是为了展示Jhn的想法在现实中的应用。故选B项。
27.What is the basis fr Jhn’s wrk?A.Nature can repair need water t n Earth is tiny creatures live in grups.
答案 A　解析 细节理解题。根据最后一段中的“Yu put rganisms in new relatinships and bserve what’s happening.Then yu let these new systems develp their wn ways t self-repair.”可知,Jhn 设计的“生态机器”的基础是大自然可以自我修复。故选A项。
三、语言能力1.掌握构词知识
vt.(利用化学物质或反应)处理
3.积累高频词块(1)clean up 　 　 (2)a series f 　 　 (3)little by little 　 　 (4)take n 　 　 (5)an inquiring mind 　　  (6)lng t d sth 　　  
4.赏析续写佳句When Jhn Tdd was a child,he lved t explre the wds arund his huse,bserving hw nature slved prblems.当约翰·托德还是个孩子的时候,他喜欢探索房子周围的树林,　　　　　　　　　　　　　　　　　　　　　　。 
观察大自然是如何解决问题的