下面是小编收集整理的高二unit8参考资料(网友来稿)，本文共5篇，供大家参考借鉴，希望可以帮助到有需要的朋友。本文原稿由网友“wzgg”提供。
篇1：高二unit8参考资料(网友来稿)
Treat common injuries
Bites & Stings
Human bites:
1. Control bleeding.
2. Wash with soap and water.
3. Call physician.
Animal bites:
1. Control bleeding.
2. Wash with soap and water.
3. Call physician.
4. Notify animal control.
Insect bites and stings:
1. Remove stinger by scraping with dull-edged item (e.g. a credit card).
2. Wash with soap and water.
3. Apply ice, a cold pack or a cold, wet washcloth for several minutes.
4. To relieve itching, apply a paste of baking soda and water, meat tenderizer or a dab of household ammonia.
5. For pain, take acetaminophen, or take an over-the-counter antihistamine if your doctor approves.
6. Pain and swelling should be relieved within 72 hours.
7. Seek immediate medical attention for stings in the nose or mouth. Swelling may block airways.
8. Seek immediate medical help if an allergic reaction develops. Symptons include: massive swelling, hives or rash, difficulty breathing, tightness in the throat or chest, dizziness, fainting, nausea or vomiting.
Snake bites:
1. Call ambulance.
2. Do not apply ice.
Broken Bones & Sprains
Fractures:
1. Do not move injured body part (never move anyone who may have a neck or back injury).
2. Call ambulance.
Sprains:
1. Apply ice.
2. Elevate injured area.
Bleeding
Minor cuts:
1. Apply direct pressure until bleeding stops (if bleeding doesn’t stop, call an ambulance).
2. Wash with soap and water.
3. Cover with dressing or bandage.
Large or deep cuts:
1. Apply pressure to stop or slow bleeding.
2. Call an ambulance.
Bruises & Scrapes
Bruises:
1. Apply ice.
Scrapes:
1. Rinse with water.
2. Wash scraped area with soap and water.
3. Apply antibacterial ointment.
Burns
Small/minor burn:
1. Apply cool, running water.
2. Cover burn with towel soaked in cold water until pain stops.
Large/severe burn:
1. Call ambulance.
2. Cover burn with towel soaked in cold water to help stop the burning process.
3. Do not apply cold water to burn over large area.
4. Never place ice on a burn. It may cause more tissue damage.
5. Remove wet towel and cover burn with clean, dry sheet.
6. Do not break blisters.
Electrical burn:
1. Disconnect power
2. Call ambulance.
Choking
Choking can result in unconsciousness or cardiopulmonary arrest. Additionally, when a child begins to choke, it’s easy to panic. We recommend that every parent take a (Pediatric Basic Life Support) training course to be prepared for choking emergency. Please check our Community Education schedule for a course that’s offered in your neighborhood.
For children 12 months old or younger:
1. Calmly sit down with the child in your arms.
2. Supporting the infant’s head and neck with one hand, lay the infant face down on your thigh. The child’s head will need to be lower than her trunk.
3. Forcefully but gently, deliver five back blows with the heel of your hand between the infant’s shoulder blades.
4. Immediately, while still supporting the infant’s head, sandwich the infant between your hands and turn her onto her back. Again, the infant’s head will need to be lower than the trunk.
5. Using two fingers, deliver five thrusts in the infant’s chest ( finger over breastbone at nipple line ).
6. Repeat back blows and chest thrusts until item is dislodged.
7. Continue until object is dislodged or until help arrives.
8. Call ambulance.
9. Don’t stick your finger in child’s throat to dislodge object. In most cases, this pushes the item further down the throat.
For anyone older than 12 months:
1. Use Heimlich maneuver.
2. Call ambulance.
Dental Emergencies
Tooth knocked out:
1. Pick tooth up by the chewing end (not the root).
2. Clean it by gently stirring it in a cup of cool milk.
3. Reinsert tooth into socket
4. If unable to reinsert tooth, place it in a cup or plastic bag containing cool milk
5. Place sterile gauze over the space where tooth was and have child gently bite down.
6. Call dentist.
Broken tooth:
1. Clean gently with warm water.
2. Apply cold compress.
3. Call dentist.
Eye Injuries
Black eye:
1. Apply ice.
Eyeball cut or impaled:
1. Call ambulance
2. Do not press on injured eye.
3. Do not use medication.
4. Do not remove any object impaled in the eye.
5. Gently cover both eyes with eye pads and secure loosely with rolled gauze.
Chemical splash:
1. Flush eye from bridge of nose to outer edge of eye with running water for at least 15 minutes.
2. Call ambulance.
3. Gently cover both eyes with eye pads and secure loosely with rolled gauze.
Fainting
1. Lay person down and raise legs.
2. Do not give anything to eat or drink.
3. Call ambulance if person doesn’t wake up.
Frostbite
1. Soak area in warm water (100 - 150 degrees) until skin begins to look pink.
2. Raise and lower affected limbs to stimulate blood flow to the fingers or toes.
3. Do not rub.
4. If frostbite is minor, call physician; if severe, call ambulance
Head Injury
Call the ambulance immediately if victim is:
1. Unconscious.
2. Seizing.
3. Unable to move body parts.
4. Has blood or fluid coming from the nose or ears.
Seek medical attention if victim is:
1. 12 months old or younger.
2. Complaining of severe or persistent headache.
3. Drowsy.
4. Persistently vomiting (three times or more).
5. Slurring speech.
6. Experiencing difficulty walking or imbalance.
7. Having vision problems.
If none of the above symptoms is present, the victim will need to be awoken every one to two hours that night. Make sure person can recognize you and the surroundings.
Neck & Back Injury
1. Call ambulance.
2. Do not move victim.
Overheating & Heat Exhaustion
1. Place person in cool, well-ventilated area.
2. Elevate legs slightly.
3. If conscious and not vomiting, give 4–6 oz. of water every 15 minutes.
4. If person has temperature of 101° or higher, call ambulance.
Poisoning
1. Call the Pittsburgh Poison Center at Children’s Hospital of Pittsburgh at 1-800-222-1222.
2. Do not give anything to eat or drink – including syrup of ipecac – unless directed by the Pittsburgh Poison Center.
3. If vomiting occurs, do not discard.
Seizures
1. Protect person from injury by placing pillow, jacket or something soft under head and clearing area.
2. Do not place anything in mouth.
3. Do not try to restrict arm and leg movement.
4. Call ambulance if seizure lasts more than 5 minutes, recurs without return to consciousness or if person has no past history of seizures.
篇2：高二unit8 Lesson 31
●Teaching Aims:
1.Do the listening and make sure that the students understand it.
2.Review the grammatical points and useful expressions in this unit.
3.Do the writing to find if the students can use the modal verbs“have to ”and“be able to”.
●Teaching Important Points:
1.The understanding of listening materials.
2.To revise the form of the English letter and train the Ss’ writing.
●Teaching Difficult Points:
1.how to use the modal verbs correctly
2.how to improve the students’ writing and listening
●Teaching Methods:
1.Listening-and-answer activity to help the students to go through the listening materials.
2.Individual or pair work or group work to train the students’ writing ability.
●Teaching Aids:
1. a tape recorder
2.some slides
3.a projector
●Teaching Procedures:
FStep Ⅰ. Greeting
Greet the whole class as usual.
FStep Ⅱ. Revision
T:In the last period,we learnt the modal verb “ought to”and revised“should/must/have to”and their negative forms“shouldn’t/mustn’t/needn’t/don’t have to”.Now I’ll check the homework.Make a sentence with a modal verb learnt and revised yesterday.
(Teacher asks Ss to make the sentences one by one.While they are doing this,teacher or other students point out the mistakes in the sentences.After this,teacher with students revises the following phrases.)
T:We have also learnt many important phrases in this unit.Now look at the phrases on the screen.First translate them into Chinese.Then make complete sentences with them.
T:Attention,please.On the screen there are 13 phrases,but only 10 sentences.You must choose ten of them and fill in the blanks with the correct forms of them.
(Teacher asks Ss to fill in the blanks one by one,then gives the suggested answers.)
Suggested answers:
1.was held up 2.to hold on
3.take it easy 4.fell off
5.make sure 6.threw up
7.to deal with 8.throw away
9.to make up 10.by mistake
FStep Ⅲ. Listening
T:Now you have understand something about first aid.Today we’re going to listen to a tape about first aid.Two mothers have just taken their children to hospital.What do you think has happened to the children?
(Teacher encourages the Ss to guess and collects the suggestions from the class.)
T:You did very well.Now please open your books.Turn to Page 152.Go through the exercises.You must know what to do.Begin,please.
(After the Ss read the demands,teacher plays the tape.The Ss begin to deal with the listening exercises.If the Ss can’t understand the details,teacher should play the tape once more so that they can completely understand the meaning of the passage.)
Listening Text:
Part 1
Nurse:Can I help you?
Mother(1):Yes,I wonder if you could look at Harry’s leg.
Nurse:What’s the matter with it?
Mother(1):He was bitten by a dog yesterday evening.It was bleeding quite badly.
Nurse:Let’s have a look at it then.I see.What did you do before bringing him here?
Mother(1):I washed the wound under running water for a few minutes.Then I dried it with a clean cloth and tied another piece of clean cloth around it.
Nurse:Have you had any pain?Does it hurt?
Harry:Yes,it does hurt a bit.
Nurse:Was it your dog?
Mother(1):No.It belongs to a neighbour.
Nurse:This is very important.The dog must be examined immediately.
Mother(1):Why is that?The dog is usually very friendly.
Nurse:If the dog has a disease that makes it bite people,your son could die.
Part 2
Nurse:Can I help you?
Mother(2):Yes,this is my daughter Jill.She is two and a half.She’s drunk some ink.
Nurse:Some ink?When did this happen?
Mother(2):About half an hour ago.
Nurse:Did you give her any first aid?
Mother(2):No,I didn’t know what to do.I thought it might be poisonous so I brought her here at once.
Nurse:Have you got the bottle with you?
Mother(2):Yes,here it is.
Nurse:Do you know how much she drank?
Mother(2):Well,the bottle was almost empty,so I think not very much.
Nurse:Right.I’ll take you to the doctor.Come this way,please.
Suggested answers:
Ex.1:Child 1:bitten by a dog;
Child 2:drank some ink.
Ex.2:Child 1:yesterday;yes(washed the wound under running water,dried it with a clean cloth and tied another piece of clean cloth around it).
Child 2:half an hour ago;no first aid.
Ex.3:1.Can I help you?
2.What’s the matter with it?
3.What did you do before bringing him here?
4.Have you had any pain?
5.Does it hurt?
6.Was it your dog?
Ex.4:two and a half;know what to do;might,poison,at once;bottle,almost empty
FStep Ⅳ. Workbook
T:Now turn to Page 111.Let’s do exercises.First do Ex.1.Fill in each blank with the modal verbs given.You can prepare it in paris.In a few minutes,I’ll check the answers.
Suggested answers:
1.may/might,can 2.Must,must,should/must/may,can
3.may/can 4.Would/Will/Can
5.ought to/should 6.Must,needn’t,may
7.can’t,should/must 8.can
9.Will 10.mustn’t/can’t,need/ought
T:Next let’s do Ex.2.Translate the sentences into English.Please do it as soon as possible.I’ll ask some students to write them on the blackboard.One student,one sentence.Let’s begin.
Suggested answers:
1.Yesterday afternoon a boy was knocked down by a car when he was crossing the street.His leg(s) bled badly.
2.A little girl fell into the lake suddenty.When she was drawn out of the lake,she had stopped breathing.
3.An old man fell off his bicycle suddenly when he was riding it in the street.His left leg was broken.
4.What will you do if someone is burnt badly in a big fire?
5.What first aid will you give a child who has taken poison by mistake?
6.You should look at both sides when you are crossing the street.
7.We needn’t hurry like this.The bus will come in half an hour.
8.Do we need to send him to hospital at once?
FStep Ⅴ. Summary and homework
T:In this class,first we have reviewed the modal verbs expressing obligation and the main phrases in this unit,such as,take it easy,stay still,fall off,deal with ,out of one’s reach,by mistake,throw up,pay attention to.You must remember them.Secondly,we have done some listening and writing.After class,you should do more listening practice to improve your listening ability,do Ex.3 in the workbook and do exercises in revision.(Write the phrases on the Bb.)
Suggested answer to Ex.3
An accident
Last Saturday afternoon I was taking a walk with my friend by the side of the river near my home when I heard a sudden cry for help.It was a boy who had fallen into the river.On seeing all this both of us jumped into the water and saved him out of the river.We tried to give him first aid to start his breathing.As soon as he came to himself,he was sent to a hospital at once and then we called his parents up to inform them of this accident.Hardly had his parents come to the hospital when we left there.
FStep Ⅵ. The Design of the Writing on the Blackboard
篇3：高二unit8补充阅读(网友来稿)
How to be a real hero
发生车祸应该马上急救。但也得救之有道哦。
WHAT would you do if you came across a car accident? A few years ago, an American football player was seen as a hero for pulling some injured people out of a damaged car. Others stood by doing nothing and, as a result, they were accused of not caring. But in fact, even the heros actions might have been wrong.
Sometimes, rescuing a car accident victim (受害者) can bring even more trouble. Once a deaf-mute (聋哑人) was thrown from his car in an accident. People carried him from the road even though he shook his head, trying to tell them not to move him. Their actions might have caused spinal injuries, possibly leaving the man in a wheelchair.
It is very important to ask the victim if they want to be moved before doing so.
Even if the person says “yes”, you still need to be cautious (谨慎的).
If an injury is very serious, then emergency first aid (急救), such as mouth-to-mouth resuscitation (人工呼吸), is usually necessary.
But if there is no immediate danger, or even if the victim is unconscious (昏迷) but still breathing normally, there is little to be gained by moving them. Its best to wait for professional (专业的) help to arrive.
However, there are several “safe” things that can be done:
* Cover the victim with a coat or blanket to keep them warm and to prevent shock.
* Shade the victim from the sun or make a shelter to protect them from rainfall.
* Talk to them, tell them help is on the way. Always be encouraging.
* Hold their hands while waiting for the ambulance (救护车). It can do a lot for an injured persons sense of survival.
* Use a clean cloth to stop the flow of blood from a serious wound.
From: www.21stcentury.com.cn
篇4：高二unit8 Lesson 29
●Teaching Aims:
1.Learn and master the following
Four skills:take it easy,knee,ought,ought to,still(adj.)
2.Everyday English
You must carry her to the side of the road.
You mustn’t move someone if they are badly hurt.
You should/shouldn’t…
I ought to go home.
I have to cook supper for my grandmother.
●Teaching Important Points:
1.Phrases:fall off,take it easy,ought to,stay still
2.Sentence Patterns:
Leave her where she is.
I ought to go home.
●Teaching Difficult Points:
1.the usage of the phrase“take it easy” in spoken English
2.the usage of the verb “ought to”
●Teaching Methods:
1.Listening to the tape to improve the students’ listening ability.
2.Question-and-answer activity to help the students to understand the general idea of the dialogue.
3.Pair work to improve the students’ ability of speaking
●Teaching Aids:
1.a tape recorder 2.a projector
3.some slides 4.a TV set
●Teaching Procedures:
FStep Ⅰ. Greetings and Revision
Greet the whole class as usual and check the homework assigned last class.
FStep Ⅱ. Lead-in
T:What’s the weather like today?
Ss:It’s sunny.
T:Yes.But now it’s winter.It’s very colder outside.You’d better wear more clothes.If not,you may catch a cold.Now I’ve caught a cold.I’ve got a headache.(Bb:headache)“-ache”can be put after some words,such as tooth,ear,head,stomach etc.Then we can get“toothache,earache,
headache,stomachache,etc.”We can say “I’ve got a toothache/stomachache/….” OK.If I’ve hurt my arm,what should I do?
S1:You should go to the hospital at once and wrap up the wound.
T:If you are bumt,what should you do?
S2:First cool the area of skin at once,then wash it and at last put a piece of dry clean cloth over it.
T:What should you do if you see an accident in the street?
Ss:……
(Teacher collects the answers as many as possible.)
FStep Ⅲ.Preparation for learning dialogue
T:Today we’re going to learn Lesson 29,a dialogue between Susan and Chen Wei.They saw an accident in the street.First let’s learn the new words and phrases in this lesson.Look at the screen.
(Teacher shows the new words on the screen.)
(Let the students read them after the tape,then teacher explains them briefly and asks the Ss to pay more attention to the phrases on the right.)
FStep Ⅳ. Dialogue
T:Now please watch TV carefully.According to the pictures,find out what the girl injured.(Teacher plays TV.After that,teacher checks the answer to the question.)
S4:Her knee,her foot and her head.
(Give the Ss a few minutes to answer the following questions.)
T:OK,Please open your books at Page 43.Read the dialogue silently and quickly.Try to find the answers to the other questions on the screen.
(After some minutes.)
T:Now,please answer the questions.Who will answer the first question?
S5:She fell off her bicycle.
T:Very good.Who knows the answer to the second question?
S6:She wasn’t moving and she was badly hurt.
T:Now the third question…
(Then ask some other students to answer the rest of the questions.)
Suggested answers to the questions left:
3.He wanted to carry her to the side of the road.
4.Because she was badly hurt.If Chen Wei moved her in a wrong way,he might hurt her more seriously/badly.
5.He went to that shop and called the First Aid Centre.
6.She felt her knee hurt,her feet and head too.
7.She wanted to get up and go home.They didn’t allow her to do so.
T:Now you have known the general idea of the dialogue.To understand the dialogue further,I’ll explain the main points,Please look at the screen.
(Bb:fall off,hurt,take it easy,ought to,leave+o.+adj./v-ing/v-ed/to do/clause stay still)
T:OK.So much for the key points.Now look at the dialogue and listen to the tape.Listen and repeat.Pay attention to the stress and intonation.After that,please read the dialogue in pairs for a few minutes.(A few minutes later.)
T:Now I’ll ask some pairs of students read the dialogue.First two girls,and then two boys.Let’s see which pair is better.OK?
Ss:Yes.…
T:Which pair do you think is better?…Yes.The two pairs are both very good.But I think if the girls read in a loud voice,they may be much better.
FStep Ⅴ. Discussion
T:Now you should know what you can do with someone who has fallen off a bicycle and hurt himself/herself.Now read the dialogue again,have a discussion in pairs and make notes about what we should do and what we mustn’t do.
(Teacher asks two students to write them on the Bb.)
Dos:Leave the person where he/she is telephone for help
tasy with the person
tell the person not to worry
tell the person to stay still
Don’ts:carry the person
move the person
let the person get up
FStep Ⅵ. Workbook
T:Now turn to Page 108.Let’s do Ex,2.Look at the pictures and say what you should do and what you mustn’t do.If you have questions,please ask me.And you can do it in pairs.
(While Ss are doing this,teacher goes round him and direct them.After a while,teacher asks three or four students to give the answers orally.)
Suggested answers:
Picture 1:You must let the stick stay where it is.If you pull the stick out,blood may rush out of the leg.If he loses one third of his blood,he may die.So send the boy to the doctor immediately.
Picture 2:If someone is trapped under a car in an accident,you mustn’t pull him out of the car.You should find enough people to lift the car safety and take the boy to the hospital at once.
Picture 3:If you find a person isn’t breathing,you must try to start his/her breathing at once.If this isn’t done within five minutes,the person will die.
Picture 4:If a person is bitten by an animal,you must wash the wound under cold running water.Then see a doctor as soon as possible.
T:Let’s do Ex,3.Put the sentences into Chinese,paying attention to the usages of modal verbs.
Suggested answers:
1.现在是星期六下午，他们应该回家了。
2.一下体育课，你们就该把这些球还回去。
3.他不该花这么多时间看电视。
4.A.瞧，有人来了。会是谁呢?
B.可能是校长。
A.不可能是他，他已经去郑州了。
B.那一定是张先生，他看起来很像校长。
5.A.当我们在家发现有人的胳膊被严重割伤，该怎么办?
B.首先，我们必须尽力为他止血，然后为他请医生。我们决不能将他抬高或移动。
FStep Ⅶ.Homework
T:Today we have learnt what we should do and what we mustn’t do when there is an accident.We also know what to do in other situations.
Today’s homework is:
1.Learn the phrases and sentence patterns by heart.
2.Write Ex.2 in your exercise-books.
FStep Ⅷ. The Design of the Writing
篇5：高二数学复习方法资料
一、抓好基础。
数学习题无非就是数学概念和数学思想的组合应用，弄清数学基本概念、基本定理、基本方法是判断题目类型、知识范围的前提，是正确把握解题方法的依据。只有概念清楚，方法全面，遇到题目时，就能很快的得到解题方法，或者面对一个新的习题，就能联想到我们平时做过的习题的方法，达到迅速解答。弄清基本定理是正确、快速解答习题的前提条件，特别是在立体几何等章节的复习中，对基本定理熟悉和灵活掌握能使习题解答条理清楚、逻辑推理严密。反之，会使解题速度慢，逻辑混乱、叙述不清。
那么如何抓基础呢?
1、看课本;
2、在做练习时遇到概念题是要对概念的内涵和外延再认识，注意从不同的侧面去认识、理解概念。
3、理解定理的条件对结论的约束作用，反问：如果没有该条件会使定理的结论发生什么变化?
4、归纳全面的解题方法。要积累一定的典型习题以保证解题方法的完整性。
5、认真做好我们网校同步课堂里面的每期的练习题，采用循环交替、螺旋式推进的方法，克服对基本知识基本方法的遗忘现象。
二、制定好计划和奋斗目标。
复习数学时，要制定好计划，不但要有本学期大的规划，还要有每月、每周、每天的小计划，计划要与老师的复习计划吻合，不能相互冲突，如按照老师的复习进度，今天复习到什么知识点，就应该在今天之内掌握该知识点，加深对该知识点的理解，研究该知识点考查的不同侧面、不同角度。在每天的复习计划里，要留有一定的时间看课本，看笔记，回顾过去知识点，思考老师当天讲了什么知识，归纳当天所学的知识。可以说，每天的习题可以少做，但这些归纳、反思、回顾是必不可少的。望你在制定计划时注意。
三、严防题海战术，克服盲目做题而不注重归纳的现象。
做习题是为了巩固知识、提高应变能力、思维能力、计算能力。学数学要做一定量的习题，但学数学并不等于做题，在各种考试题中，有相当的习题是靠简单的知识点的堆积，利用公理化知识体系的演绎而就能解决的，这些习题是要通过做一定量的习题达到对解题方法的展移而实现的，但，随着高考的改革，高考已把考查的重点放在创造型、能力型的考查上。
因此要精做习题，注意知识的理解和灵活应用，当你做完一道习题后不访自问：本题考查了什么知识点?什么方法?我们从中得到了解题的什么方法?这一类习题中有什么解题的通性?实现问题的完全解决我应用了怎样的解题策略?只有这样才会培养自己的悟性与创造性，开发其创造力。也将在遇到即将来临的期末考试和未来的高考题目中那些综合性强的题目时可以有一个科学的方法解决它。
四、常做高考题，揭开高考试题的神秘面纱。
高考题是的习题，它在考查知识点时的切入点新而不俗，它正确地控制了对所考查的知识点的难度。解答一定的高考题，有助于把握高考对该知识点的难度要求;有助于判断高考题目与平时常见题目的异同，增强判断题目信度的能力，防止做偏题、怪题。
特别在排列组合二项式定理、复数、立体几何、极坐标、三角部分的高考题，难度不大，而平时所见的复习资料中，有相当的习题已超出高考难度，其实，高考题目中这几部分的习题复习时都能做，并不是很难，更不可怕，可见常做高考题，会克服对高考题的恐惧感。增强将来决胜高考的自信心。
高二数学选择题解题方法详解
【选择题的解题方法】
方法一：直接法
所谓直接法，就是直接从题设的条件出发，运用有关的概念、定义、性质、定理、法则和公式等知识，通过严密的推理与计算来得出题目的结论，然后再对照题目所给的四个选项来“对号入座”.其基本策略是由因导果，直接求解.
方法二：特例法
特例法的理论依据是：命题的一般性结论为真的先决条件是它的特殊情况为真，即普通性寓于特殊性之中，所谓特例法，就是用特殊值(特殊图形、特殊位置)代替题设普遍条件，得出特殊结论，对各个选项进行检验，从而作出正确的判断.常用的特例有取特殊数值、特殊数列、特殊函数、特殊图形、特殊角、特殊位置等.这种方法实际是一种“小题小做”的解题策略，对解答某些选择题有时往往十分奏效.
注意：
在题设条件都成立的情况下，用特殊值(取得越简单越好)进行探求，从而清晰、快捷地得到正确的答案，即通过对特殊情况的研究来判断一般规律，是解答本类选择题的较佳策略.近几年高考选择题中可用或结合特例法来解答的约占30%.因此，特例法是求解选择题的好招.
方法三：排除法
数学选择题的解题本质就是去伪存真，舍弃不符合题目要求的选项，找到符合题意的正确结论.筛选法(又叫排除法)就是通过观察分析或推理运算各项提供的信息或通过特例，对于错误的选项，逐一剔除，从而获得正确的结论.
注意：
排除法适应于定性型或不易直接求解的选择题.当题目中的条件多于一个时，先根据某些条件在选项中找出明显与之矛盾的，予以否定，再根据另一些条件在缩小选项的范围内找出矛盾，这样逐步筛选，直到得出正确的答案.它与特例法、图解法等结合使用是解选择题的常用方法，近几年高考选择题中占有很大的比重.
方法四：数形结合法
数形结合，其实质是将抽象的数学语言与直观的图形结合起来，使抽象思维与形象思维结合起来，通过对图形的处理，发挥直观对抽象的支持作用，实现抽象概念与具体形象的联系和转化，化难为易，化抽象为直观.
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