文档内容
阶段综合检测(二)
Ⅰ.阅读理解(共15小题；每小题2分，满分30分)
A
My dad died before my senior year of high school.When my dad died，I was
thrown into a mess.After the football season ended，I stopped doing any kind of
exercise and started eating my emotions.That was when my real weight gain
began.Within two years，I gained more than 150 pounds.
But the older I got，the more I began to notice there weren't a lot of
closeto500pound guys who were successful businessmen and family men.I wanted
that version (版本) of the American dream—businessman，husband，and father—and
I decided I couldn't have it unless I made some big changes.
I started working out at the gym.It wasn't easy，but I didn't give up.By the
time I turned 20 ，I had lost about 140 pounds ，and people had started to
notice.I felt good.I started showing my arms at the gym.But it didn't last long
—I found that although I still worked out every day，my weight was kept at 360
pounds.
In the spring of 2017，I joined a personaltraining program.The program gave
me an inside look at my food theories and helped me understand that there's more
than one way to lose weight or reach a goal.The light bulb was really switched
on when I realized I was an emotional eater.
I'm still dealing with that.The key for me is knowing it exists，and then
knowing how to fight against it.But some days，I still found myself wanting a
chocolate pie because I had a bad day.When I feel like eating that pie，I have
to ask myself，“What is this arising from？” That allows me to stop and consider
why I'm feeling poorly and understand the source of the craving (渴望) for that
pie.
After changing my diet，my weight started dropping again.So far I've lost
275 pounds in total.
【语篇解读】 语篇类型是记叙文，主题语境是生活。父亲去世后，作者经常用食物来安
抚自己的情绪，导致体重暴增。他后来是怎么减肥的呢？
1．What happened to the author after his father's death?
A．He began to play football.
B．He ate much more than before.
C．He started hiding his emotions.
D．He stopped going out with others.
B [细节理解题。根据第一段中的 After the football season ended，I stopped
doing any kind of exercise and started eating my emotions.That was when my real
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂weight gain began可知，作者的父亲去世后，他吃得比以前多了很多。]
2．Why did the author want to lose weight at first?
A．He was often laughed at by others.
B．His family required him to do that.
C．He feared his weight would hold him back.
D．He was inspired by a successful businessman.
C [细节理解题。根据第二段中的I wanted that version of the American dream—
businessman，husband，and father—and I decided I couldn't have it unless I made
some big changes可知，作者决定减肥是因为担心自己的体重会影响梦想的实现。]
3．What did the author realize after losing about 140 pounds?
A．Working out at the gym was hard.
B．Workouts were no longer working.
C．People began to admire his body shape.
D．The personaltraining program suited him better.
B [细节理解题。根据第三段中的But it didn't last long—I found that although
I still worked out every day，my weight was kept at 360 pounds可知，作者意识到通
过健身减肥已经没什么效果了。]
4．What does the underlined word “that” in Paragraph 5 refer to?
A．The problem of weight gain.
B．The problem of losing weight.
C．The problem of being craving for food.
D．The problem of being an emotional eater.
D [指代判断题。根据第四段中的 The light bulb was really switched on when I
realized I was an emotional eater可知应选D项。]
B
Each year ， millions of children around the world are unable to go to
school.To draw attention to this widespread problem，the United Nations (UN)
is putting education first.Recently，the UN screened a documentary film called
Back to School.The film is the second in a series of documentaries (纪录片) for
the project Time for School.
These films follow seven children from seven different countries.This
12year project began in 2003，when the children first started school.“This
is something we could do to help the education crisis in the world，” said
producer and writer Judy Katz.“Documentary filmmakers can get deeply
involved in a problem and do something about it.”
More than 100 million children will never set foot in a school.Sixty percent
of those children are girls.Cheryl Faye ， head of the UN Girls Education
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂Initiative，spoke about the many factors that prevent girls from getting an
education.One problem is the long distance many children must travel to get
to school.Also，girls in many cultures are traditionally expected to marry early
and work to help their families.“We need to make a special effort for
girls，”Faye said.
As part of the UN's Millennium goals，the organization wanted every single
child to get at least an elementary education.
Students from Lawrence Middle School in New York were deeply moved after
they saw the film.The seventhgrade class is raising money to help build a
library on the outskirts of Nairobi ， Kenya ， where Joab － a child in the
documentary－lives.The class teacher，Karen Weiner，and the class are known in
their school as the “Kenya crew”．All the kids were really happy to support
Joab and said they felt great about their fundraising efforts.Like the seventh-
graders at Lawrence Middle School ， kids can work together to make a
difference in places like Nairobi.By raising money for education，kids can help
children on the other side of the world have a chance of a better，happier life.
5．What's the purpose of the UN screening the documentary film Back
to School?
A．To raise awareness of the need for global education.
B．To show the achievements which have been made in the past few years.
C．To raise funds for global education.
D．To encourage all the children to come back to school.
A [细节理解题。根据第一段第二句可知：联合国放映纪录片《重返校园》的目的是唤
起人们对全球教育的关注。]
6．Which of the following could not be the factor that prevents girls from
getting an education?
A．Long distance from school.
B．Being born weak.
C．Helping work for the family.
D．Early marriage.
B [细节理解题。根据短文第三段可知：路程远、帮助家里干活、早婚都是女孩不能上
学的原因，而“天生虚弱”短文中没有提到。]
7．Why are the class teacher，Karen Weiner，and the class considered as
“Kenya crew”？
A ． Because they are trying their great efforts to raise money for the
education of Kenya children.
B．Because they are actors in the documentary film Back to School.
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂C．Because they are mostly from Kenya，where the child in the documentary
lives.
D．Because they all have the same experience as Joab，the Kenya child.
A [推理判断题。第五段提到，他们在看完电影之后，就募集资金以帮助在 Nairobi市
郊建图书馆，因此他们被称作“Kenya crew”。]
8．The last paragraph mainly discusses ________.
A．American middle school students' desire to go to Kenya
B．the content of the documentary film Back to School
C．an example of being inspired to take action after seeing the film
D．how students from Lawrence Middle School raise money for their education
C [主旨大意题。此段主要讲述的是Lawrence中学在看完电影之后所采取的行动，因此
C项正确。]
C
A week ago，my family stayed several nights on the Oregon Coast.It was the
day before we were to leave and drive home，and I was reading on the sofa.As I
was finishing a paragraph，I smelled smoke.It wasn't very strong，but it felt
out of place，so I looked around.
Outside our kitchen window ， I could see smoke blowing by in the swift
coastal wind.I ran to the front door.Standing there，I saw that the tall grass
in the front yard was burning.I warned my family and hurriedly，we dashed off
and sought safety.
Neighbours gathered around.Although some of them were also vacationing，they
quickly sprang into action by aiming water at the base of the flames.It was
only a few minutes before the local fire department arrived.Soon the fire was
put out and the fire department left.Thankfully ， the fire left the house
untouched.
It was amazing to see how a community of complete strangers came together to
make sure everyone was okay.Although no one was one hundred percent sure what
caused the fire，it was believed that it was caused by a friend of someone
living in the house next to the one we were staying in at the time.Apparently，
he had flicked (轻弹) cigarette ash into the bush earlier that same day.We were
really lucky to come away without harm to the house or to ourselves.
This week，the smoke from forest fires in the Pacific Northwest has been
thick.Many of these fires were caused by lightning ， but the principle I'm
reminded of is the same.Warm summer weather brings greater levels of fire
danger.Please use fire carefully.
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂【语篇解读】 语篇类型是记叙文，主题语境是生活。作者一家外出旅行时，租住的房
子门口发生了火灾，邻居们虽然不熟但都纷纷伸手援助。
9．What did the author realize after observing at the front door?
A．He should go to the front yard.
B．Someone had set fire to the house.
C．He should turn to his family for help.
D．Their house was at risk of catching fire.
D [细节理解题。根据第二段中的 Standing there，I saw that the tall grass in
the front yard was burning.I warned my family and hurriedly，we dashed off and
sought safety可知，作者意识到他们的房子可能会着火。]
10．How did the neighbours respond when realizing the situation?
A．They all ran away for safety.
B．They instantly looked into the cause.
C．They immediately took action to help.
D．They made sure their houses were safe.
C [细节理解题。根据第三段中的 Neighbours gathered around...they quickly
sprang into action by aiming water at the base of the flames可知，邻居们纷纷伸手
援助。]
11．What probably caused the incident?
A．Lightning.
B．A forest fire.
C．Cigarette smoking.
D．The neighbour's carelessness.
C [细节理解题。根据第四段中的Apparently，he had flicked cigarette ash into
the bush earlier that same day可知C项正确。]
12．What can be concluded from the text?
A．We should help to prevent forest fires.
B．We should be careful when travelling.
C．We should learn how to avoid lightning.
D．We should be cautious about using fire.
D [推理判断题。结合全文及最后一段中的Please use fire carefully可知，作者结
合自己遭受火灾的经历，告诫我们用火要谨慎。]
D
Team building games can be fun for teenagers.They can also be tools for
strengthening the group.There are many levels of team building exercises.Let's
look at some activities that can help you build a stronger team.
Pass the Clap
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂Pass the Clap works well as a beginning activity to help your group get to
know each other.Have the participants stand in a circle.One person starts the
clap and then turns to face the person next to him.As they are about to make eye
contact，they clap together.That next person now has the clap and he has to pass
it on.Continue to pass the clap around the circle.
Blindfolded Birthday
Blindfolded Birthday works well after people have become a little more
familiar with each other.Everyone puts on a blindfold.Then，without talking，
they have to line up in order of birthdays.
Two Truths and a Lie
Two Truths and a Lie can be played anytime in the group's operations.Have
the participants sit in a circle.Each person is supposed to tell two truths and
a lie about themselves.The group has to guess which is the lie.
Human Knot
Human Knot is an activity best played after your group has gotten quite
familiar with each other ， because there can be a lot of touching going
on.Everyone gathers in a circle.They put their right hands in the middle of the
circle.They grab someone else's hand.Then the left hands go in the middle and
they grab someone else's hand.The group is now knotted up.The object of Human
Knot is to untie the group without letting go of any hands.
13．Pass the Clap is most helpful for ________.
A．starting relationships
B．rebuilding relationships
C．welcoming close friends
D．celebrating some events
A [推理判断题。根据Pass the Clap部分中的第一句可知，Pass the Clap是一个能
够让你们团队彼此增进了解的初始化活动，由此可见Pass the Clap对开展人际关系最有帮
助。故A项正确。]
14．When playing Human Knot，________.
A．the participants shouldn't see each other
B．everyone should grab two people's hands
C．everyone should tell their birthday to others
D．the participants shouldn't have any body contact
B [细节理解题。根据最后一段中的第四、五、六句可知，玩Human Knot的时候，每个
人的左手和右手都要拉住别人的手。故选B项。]
15．Which game is suitable for both strangers and familiars?
A．Pass the Clap.
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂B．Blindfolded Birthday.
C．Two Truths and a Lie.
D．Human Knot.
C [细节理解题。根据Two Truths and a Lie部分中的第一句可知，Two Truths and a
Lie适用于团队关系的任何一个阶段，也就是陌生人和熟人都可以玩这个游戏。故选C项。]
Ⅱ.阅读七选五(共5小题；每小题2分，满分10分)
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余
选项。
Everyone knows it's necessary to say “thank you” after receiving a gift or
others' help ， but many people don't know how to thank people in a proper
way.It's best to send a brief，personal note.__16__
Make it personal.Use simple note cards rather than write your name on an
amusing card purchased at the gift shop.__17__ The receiver will appreciate
your taking the time to express thanks.
Get to the point right away.Thankyou cards should be short and sweet.Look at
the following example，“Thank you ever so much for the charming vase.I'm sure it
will bring my house to life.” __18__
For some receivers，add some news about your life.__19__ But if you receive
a gift in the mail from people who see you infrequently and who would like to
know more about what's going on in your life，write briefly about what you've
been up to recently.
__20__ Write and send it within one week after receiving the gift.Waiting
too long to send a note tells the gift giver you really don't appreciate his/her
generosity.
A．Write the note as soon as possible.
B．This isn't always suitable obviously.
C．Here are some tips on writing a thankyou note.
D．Never type a “thank you”－write it by yourself.
E．Sending a thankyou note through the mail shows effort.
F．Thankyou notes aren't difficult to write，and they don't take much time.
G．As you can read ，the writer thanked the gift giver immediately and
frankly.
【语篇解读】 语篇类型是说明文，主题语境是生活。文章介绍了如何写感谢信。
16．C [空前提到感谢别人的方式是写感谢信，空后列举了写感谢信的方法可知，C项
符合逻辑，引出下文。]
17．D [本段主旨为要让感谢信个性化、私人化。D项“不要输入‘谢谢’——要亲自写”与
本段主旨吻合。]
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂18．G [本段主旨为要开门见山，直接说到点子上，以及根据空前的举例可知，G项“正
如你所读到的，作者真诚直接地感谢送礼物的人”符合语境。]
19．B [根据空后的转折可知，B项“显然这并不总是合适的”符合逻辑，且This指代空
前内容。]
20．A [本段主要讲了在收到礼物后尽快发送感谢信，不要等太长时间，A项“尽快写
信”与本段内容吻合，总领该段。]
Ⅲ.完形填空(共20小题；每小题1.5分，满分30分)
Years ago，we celebrated our oldest son's first birthday by holding a super
party.I spent months __21__，cutting out handmade banners (横幅) and making all
kinds of decorations.I kept __22__ my husband's work as he built a cardboard
city background.And I would lose __23__ of my emotions when it didn't progress
exactly as I __24__.
I didn't know exactly why I stuck to __25__ a party like that，but I felt
this unspoken __26__.It was a feeling that my __27__ as a mom and my love for
my son were tied to how __28__ this party was.In fact，my son was turning one
year old，and he had no idea what was going on.__29__，this clearly meant
nothing to him.
I tried to __30__ other people and maybe even prove something to myself，
only to find it made me __31__.On his birthday，I put on a ton of makeup (化妆
品) to __32__ my stress and smiled to our __33__ even though I nearly broke
down.It was the __34__ party because of the memories attached to it! I ruined a
__35__ memory for me as a mother and decided to make a __36__.
Last weekend，we celebrated my other son Hudson's sixth birthday.He asked a
Ninjago theme ， so a week before the party ， I searched Amazon (a shopping
website) and __37__ a banner and some basic party materials as he __38__.On that
day，we ordered a big meal and used disposable (一次性的) plates to avoid hours
of cleaning up.The party was __39__ but perfect.As Hudson went to bed that
night，he told me it was his best birthday ever.
Parents' __40__ for kids does not lie in the complexity of celebrating
kids' birthday.
【语篇解读】 语篇类型是记叙文，主题语境是生活。文章讲述了作者从给大儿子准备
生日会的经历中吸取教训，不再盲目地追求完美，简简单单也是一种美。
21．A.waiting B．studying
C．thinking D．preparing
D [ 根 据 下 文 的 cutting out handmade banners and making all kinds of
decorations可知，此处是指为儿子的生日会做准备。]
22．A.ignoring B．checking
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂C．finding D．doubting
B [根据语境可知，“我”时刻都在监督检查着丈夫的工作。]
23．A.sight B．count
C．control D．track
C [根据下文的描述可知，如果事情不像“我”期望的那样进行，便会情绪失控。]
24．A.expected B．explained
C．learned D．promised
A [参考上题解析。]
25．A.ruining B．leaving
C．attending D．organizing
D [根据上下文内容可知，此处是指组织生日会。]
26．A.fears B．concern
C．pressure D．questions
C [根据32空后的stress可知，此处是指说不出的压力。]
27．A.identity B．job
C．dream D．plan
A [根据空后的as a mom可知，“我”认为自己母亲的身份与生日会举办得多么成功密切
相关。]
28．A.personal B．successful
C．familiar D．difficult
B [参考上题解析。]
29．A.However B．Besides
C．Anyhow D．Therefore
D [根据空前的he had no idea what was going on可知，儿子才一岁，他对生日会举
办得怎么样还没有概念，因此“我”所做的一切对于儿子来说没有什么意义。]
30．A.persuade B．impress
C．inspire D．remind
B [根据下文的prove something to myself 可知，“我”辛苦准备完美的生日会不仅是
为了证明自己，也是为了让生日会给他人留下深刻的印象。impress符合语境。]
31．A.exhausted B．annoyed
C．excited D．surprised
A [根据第33空后even though I nearly broke down可知，“我”竭尽全力为儿子办生
日会，结果却把自己搞得筋疲力尽。]
32．A.create B．experience
C．increase D．hide
D [根据空前的a ton of makeup可知，“我”希望通过化妆来隐藏自己的压力与不安。]
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂33．A.neighbors B．guests
C．colleagues D．classmates
B [根据第31空后的On his birthday可知，此处是指宾客。]
34．A.best B．newest
C．worst D．biggest
C [根据第35空前的ruined以及下文“我”的改变可知，此处是指这是最糟糕的一次生
日会，“我”毁掉了这个珍贵的回忆。]
35．A.valuable B．sad
C．clear D．short
A [参考上题解析。]
36．A.mess B．deal
C．change D．joke
C [根据下文内容可知，“我”决定做出一些改变。]
37．A.designed B．made
C．bought D．wanted
C [根据空前searched Amazon可知，此处是指购买。]
38．A.asked B．did
C．taught D．behaved
A [第36空后的He asked a Ninjago theme 有提示。]
39．A.happy B．simple
C．complex D．boring
B [根据该段对这次生日会的描述以及空后的转折可知，此处是指这次生日会很简单但
是很完美。]
40．A.advice B．praise
C．pity D．love
D [根据两次生日会对比及第27空后的my love for my son可知，父母对孩子的爱不
在于生日会的复杂程度。]
Ⅳ.语法填空(共10小题；每小题1.5分，满分15分)
阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Young people on the latest HIV drugs now have nearnormal life expectancy (预
期寿命) because of improvements in treatment.According to the study ，those
41.________ start treatment early may end up 42.________ (achieve) a long and
healthy life.
The researchers said the success of HIV treatment was a result of newer
drugs with fewer side 43.________ (effect)．The new treatment，which has been
widely recognized as one of 44.________ greatest public health success stories
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂of the past 40 years，involves a 45.______ (combine) of three or more drugs
which block (阻碍) the normal progress of HIV.The researchers hope that their
findings will make it easier for people with HIV 46.________(get) insurance and
stay in employment.
Jimmy Isaacs,28 ， has been suffering 47.________ HIV for nearly three
years.He 48.________(take) three drags once a day at 18：00 and will continue
to do so for the rest of his life.“Thanks to the new treatment，I can look
forward to a longer and 49.________ (healthy) life，” he said.
But many people with HIV are still at risk.This is 50.________(particular)
true in the developing world because of the limitations of the drugs.
【语篇解读】 语篇类型是说明文，主题语境是社会。随着相关治疗水平的进步，现在
接受最新艾滋病毒药物治疗的年轻人的预期寿命可接近正常人。
41．who [空白处所填词引导定语从句，修饰先行词those，并在从句中作主语。]
42．achieving [end up doing sth.意为“以做某事结束”。]
43．effects [few修饰可数名词复数形式。]
44．the [形容词最高级前习惯多用定冠词。]
45．combination [a combination of 意为“……的混合或组合”。]
46．to get [此处为句型make it＋adj.＋for sb.to do sth.，其中it是形式宾语，
真正宾语是后面不定式结构。]
47．from [suffer from意为“遭受；患病”。]
48．takes [根据时间状语once a day at 18：00表示经常性情况可知，用一般现在
时。]
49．healthier [空白处所填词和空前的longer 是并列成分，故用healthy的比较
级。]
50．particularly [空白处所填词在句中修饰true，故用其副词形式。]
Ⅴ.短文改错(共10小题；每小题1分，满分10分)
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共
有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。
删除：把多余的词用斜线(\)划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1.每处错误及其修改均仅限一词；
2．只允许修改10处，多者(从第11处起)不计分。
As far as we know，time is not always enough all of us.So first of all，we
need to arrange our time good.We'd better to make a longterm study plan.That is
to say ， make an onemonth plan with more efforts to take up your weak
subjects.And a shortterm plan is equal necessary，if not more important.We have
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂to make sure what we need to do each day，each class or even each minute.At the
same time，it's quite essential to keeping healthy.So take exercise for at least
one hour and sleep for no less than seven hour a day.And don't forget to eat
well.More fruit was always right for us.
[答案]
As far as we know，time is not always enough \s\up7(∧ ) all of us.So first
of all ， we need to arrange our time .We'd better make a longterm study
plan.That is to say，make onemonth plan with more efforts to take up weak
subjects.And a shortterm plan is necessary，if not more important.We have to
make sure what we need to do each day，each class even each minute.At the same
time，it's quite essential to healthy.So take exercise for at least one hour
and sleep for no less than seven a day.And don't forget to eat well.More fruit
always right for us.
①考查介词。句意：据我们所知，时间对我们所有人来说并不总是够的。根据句意可知，
这里表示“对于……来说”，故在enough后面加for。
②考查副词。句意：所以，首先我们需要安排好自己的时间。修饰动词 arrange，要用
good的副词形式well。
③考查固定搭配。had better do sth.“最好做某事”，是固定搭配，故删掉to。
④考查冠词。plan是可数名词，在此表泛指，且one的发音以辅音音素开头，所以前面
要用a。
⑤考查代词。根据文章前面的表达可知，这里应该用第一人称，故把your改为our。
⑥考查副词。修饰形容词necessary要用equal的副词形式equally。故把equal改为
equally。
⑦考查连词。根据上下文的意思可以判断出，这里表示“和”，而不是选择关系。故把or
改为and。
⑧考查非谓语动词。根据句子结构可以判断出，it是形式主语，而真正的主语是不定式
短语to keep healthy。故把keeping改为keep。
⑨考查名词单复数。由于可数名词hour前有seven修饰，所以要用其复数形式。故把
hour改为hours。
⑩考查时态。这里说的是客观事实，所以要用一般现在时。故把was改为is。
Ⅵ.书面表达(满分25分)
假如你是李华。为了加强大家的消防安全意识，你校邀请了一名消防员给大家进行了一
场安全知识讲座。现请你给美国朋友Peter写一封信，告知活动情况以及你的感受。要点如
下：
1.活动时间为上周三下午3点；
2.活动地点为学校大厅。
注意：1.词数100左右；
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂2.可以适当增加细节，以使行文连贯；
3.开头和结尾已为你写好，但不计入总词数。
Dear Peter，
I'm writing to tell you something about the lecture held in our
school._________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
__________________________________________________________________
Yours，
Li Hua
[参考范文]
Dea r Pete r ，
I'm writing to tell you something about the lecture held in our school.
In order to raise our safety awareness，our school invited a fireman to give
us a lecture on fire safety.It was held at our lecture hall at 3 pm last
Wednesday.
First of all ， some videos about fire accidents were shown to tell the
necessity and importance of fire prevention.Then，the fireman told us how to
react in case a fire occurs.Finally，a Q&A session was arranged to answer the
related questions and help us get a better understanding of fire safety.
Thanks to the lecture，I've learned how fast a fire can grow and what little
time we may have to react.So destructive is a fire that each of us should be
cautious in our daily life to prevent it from happening.
Your s ，
Li Hua
更多资料添加微信号：hiknow_007 淘宝搜索店铺：乐知课堂
