八年级深圳（S）寒假版
第1版
寒假作业（一）词汇与句型篇
词汇运用
I. 1. ability 2. include 3. win 4. promise 5. double
II. 1. musician 2. traffic 3. chess 4. rest 5. born
III. 1-5 CBAAB
IV. 1. and so on 2. found out 3. copy down
4. go for a walk
5. challenge; to
句型演练
I. 1-5 CABBB
II. 1. is famous for 2. promised to buy 3. Since then
4. follow his father’s advice
5. go for a walk
III. 1. Joy won a prize for her new invention.
2. This book is not as interesting as you think.
3. Kathy’s job includes typing letters and answering the phone.
4. Some like living in the countryside but others don’t.
5. Human beings showed their great intelligence a long time ago.
第2版
寒假作业（二）语法篇
语法专练
I. 1-5 CCBAB 6-8 ABC
II. 1. anything; nothing 2. Fiftieth 3. nobody 4. eighth; Eight
5. anybody; nobody
6. multiply
7. everything
8. hundred
III. 1. isn’t anything new 2. doesn’t know anything 3. divided by; equals
4. there’s nothing
5. What’s
IV. 1. Nothing is difficult 2. Millions of 3. haven’t called anyone
4. plus; equals/is
5. was born; May the fourth
V. 1. B special something 改为something special
2. C make改为makes
3. A hundreds 改为hundred
4. A multiplies 改为multiplied
5. B three 改为third
VI. 1. a 2. her 3. spent 4. unluckily 5. because
6. after
7. death
8. thirteenth
9. hiding 10. millions
寒假作业（三）读写综合篇
语法填空
1. prizes
2. youngest
3. for
4. showing
5. when
6. badly
7. and
8. improve
9. spoke 10. first 完形填空1-5 CBCBA 6-10 BCCAB
阅读理解1-5 CDBDA
书面表达
One possible version：
Dear Wen Qi,
I’m happy to hear from you. I know you have two problems about English learning.
I have some advice for you. Listening to English songs is a good way. You can also watch English news on TV or read some English newspapers. Don’t be shy or afraid of making any mistakes when you speak English. You should often talk with your classmates in English. I hope my advice can help you improve your English.
I hope you will do better in English.
Yours,
Linda
第4版
寒假作业（四）词汇与句型篇
词汇运用
I. 1. type 2. operate 3. popular 4. develop 5. funny
II. 1. comfortable 2. speaker 3. century 4. special 5. passenger
6. depends
7. price
8. Compare
9. candles 10. distance
III. 1-5 ACABC
IV. 1. instead of 2. worked as 3. In addition
4. are short of
5. looked forward to
句型演练
I. 1-5 ABBBA
II. 1. what to do with the problem 2. depend too much on
3. refer to the good effects of
4. give me some advice on
5. was unaware of
6. make a mess
7. were able to leave
8. in the daytime 9. keep in touch with you
10. are better at giving speeches than me
III. 1. I’ve never imagined using computers for teaching.
2. Many inventions are becoming more and more practical.
3. The teacher allows us to discuss the problem now.
4. Don’t try to stop him from developing new ideas.
5. Thank you for helping me get through many hard times.
寒假作业（五）语法篇
语法专练
I. 1-5 BABCC 6-8 BAC
II. 1. much 2. fresher 3. wise 4. warm
5. farthest/furthest
6. hottest
7. better; better
8. worse III. 1. more expensive than 2. the most interesting
3. doesn’t look as beautiful a s
4. smaller than
5. as deep as
IV. 1. becoming worse and worse 2. one of the most dangerous animals
3. as popular as
4. cleverer; happier
5. a farther/further place than
V. 1. A more 改为most 2. A farther 改为further
3. B many 改为much
4. C large 改为larger
5. B stronger 改为strong
VI. 1. second 2. than 3. seats 4. closer 5. until
6. angrily
7. tasted
8. cost
9. getting 10. in
第6版
寒假作业（六）读写综合篇
语法填空
1. made
2. inventor
3. when
4. appeared
5. for
6. like
7. quickly
8. building
9. us 10. wonderful
完形填空
1-5 BACBA 6-10 CABCC
阅读理解
1-5 BACBD
书面表达
One possible version:
My first DIY job
DIY is popular among young people. I did my first DIY job yesterd ay.
Last week I bought some paint and two brushes on the Internet. I read the instructions first before painting. At first, I painted all the walls blue. But the room looked a little boring. Then I decided to draw some colourful fish and a boat on the wall. There was paint all over the floor. I had to spend one more hour tidying up the room. Now the room looks really great.
I hope to learn more about DIY. I will take a course in it. And I will buy some books about DIY. I believe I will do better next time.
寒假作业（七）词汇与句型篇
词汇运用
I. 1. host 2. ancient 3. succeed 4. empty 5. understand II. 1. local 2. secret 3. introduce 4. success 5. steal
6. exchange
7. touring
8. celebrate
9. respect 10. except III. 1-5 ABACA
IV. 1. a bit of 2. play tricks on 3. fall asleep 4. act out 5. except for 句型演练
I. 1-5 ABABC
II. 1. the same age as 2. make jokes about 3. kept hoping
4. was glad to get
5. be friendly to
6. Except for
7. plan to come over to 8. pull grains into 9. one another
10. afraid of making decisions
III. 1. I decide to apply for the job.
2. My parents are proud of my success.
3. Kevin has never travelled outside the country so far.
4. Our team played badly at first but won in the end.
5. His mind is filled with many fantastic ideas.
第8版
寒假作业（八）语法篇
语法专练
I. 1-5 CCAAC 6-8 BCB
II. 1. has finished 2. have been 3. have known 4. haven’t spoken
5. has lived
6. have raised
7. has had
8. bought
III. 1. since three hours ago 2. Have; heard 3. haven’t; yet
4. What have; read
5. How long
IV. 1. Has she had anything since 2. has gone to
3. How many times have; visited
4. have never experienced
5. has been interested; since; was
V. 1. B been 改为gone 2. C saw改为seen
3. A borrowed 改为kept
4. C for 改为since
5. A Have改为Has
VI. 1. been 2. since 3. a 4. playing 5. for
6. better
7. trouble
8. decided
9. quickly 10. him
寒假作业（九）读写综合篇
语法填空
1. an
2. chances
3. than
4. kept
5. them
6. hitting
7. surprised
8. However
9. until 10. do
完形填空
1-5 CBACB 6-10 ACBAC
阅读理解
1-5 ABDDC
书面表达
One possible version:
Keep ourselves safe
It’s important for us to keep ourselves safe. First, we should always keep the door closed when we are at h ome alone. We shouldn’t let any strangers in. When we are walking or riding a bike on the way to school, we should always follow traffic rules. And we should call 120 or 110 at once when we see accidents on the road. When we are on a bus or the underground, we should be careful with our own things and never push others.
第10版
寒假作业（十）词汇与句型篇
词汇运用
I. 1. worth 2. trouble 3. chance 4. winner 5. hide
II. 1. memories 2. hide 3. notice 4. chance 5. shy
6. lose
7. mentioned
8. choose
9. worth 10. unless
III. 1-5 ABBCA
IV. 1. have trouble 2. take out 3. in public 4. Look out 5. put on
句型演练
I. 1-5 ABABA
II. 1. have a balanced diet 2. talk about our opinions in public
3. at the corner of
4. are worth buying
5. has fun collecting stamps
6. show yourself confidently
7. In my opinion 8. pouring out her troubles
9. switch off / turn off 10. set a trap
III. 1. The car is old and isn’t worth buying.
2. What do you think of your memory course?
3. Who is the winner of the dancing competition?
4. Living a healthy life helps you improve your memory.
5. Please give me some advice on how to choose useful books.
寒假作业（十一）语法篇
语法专练
I. 1-5 ABACB 6-8 CCB
II. 1. ask 2. work 3. choose 4. won’t watch; have
5. will be
6. boils
7. protect
8. do
III. 1. if, doesn’t 2. had better not ask
3. What should
4. What happens
5. shouldn’t spen d IV. 1. ought to learn 2. had better take 3. Unless; improve
4. I f; don’t have; won’t write
5. shouldn’t make fun of
V. 1. A to 去掉 2. B reading 改为read
3. C unless 改为if
4. B help 改为helps
5. A not better 改为better not
VI. 1. on 2. them 3. or 4. treat 5. tricks
6. usually
7. celebrated
8. a
9. sticky 10. playing
第12版
寒假作业（十二）读写综合篇
语法填空
1. writers
2. celebrated
3. more
4. But
5. depends
6. or
7. because
8. easily
9. mentioned 10. reading 完形填空
1-5 BAACA 6-10 BABAC
阅读理解
1-5 ABBCA
书面表达
One possible version:
Dear classmates,
May I have your attention please?
We will go on a class trip this Saturday. We are going to Tiansheng Bridge Park by bus. The bus leaves at 7:30 am and returns at 4:30 pm. So we will have a full day in the park. We plan to have a picnic. So everyone should prepare some food. In the morning, we will go boating. And after the picnic, we can climb the hill. Please wear your sports clothes.
The cost of the trip is 20 yuan per person.
Thanks for listening.
第13-14版
2. doubled
3. special
4. already
5. celebrate
6. except
7. expensive
8. speech
9. create 10. unless
II. 1-5 BACCA
III. 1-5 BACAC
IV. 1. introduce; to 2. A bit of 3. Since then
4. looking forward to
5. copied down
6. In the end
7. in public
8. so far
10. die out
II. 1. How can we 2. Why did; die out suddenly 3. No; know nothing
4. What were; like
5. What do you think of
III. 1. was worth trying 2. works as 3. make jokes about
4. never imagined talking with
5. depend on yourself
IV. 1. In ancient times; in the daytime 2. challenged the king to
3. Hundreds of passengers
4. at a faster speed
5. win the competition
V. 1. The great scientist was born in a rich family.
2. You had better go to sleep earlier.
3. They entered the cinema without tickets.
4. Students should always respect their teachers.
II. 1. second 2. greatest 3. have visited 4. interesting 5. has lost 6. farthest 7. more popular 8. type 9. stop 10. have been III. 1. pick 2. replied 3. with 4. surprised 5. These
7. When 8. others 9. understood 10. before
2. soldier
3. imagine
4. respect
5. scientist
：
We did a survey among a group of 100 young students between 13 and 15 in order to know what they use the computers for. All the students used computers to
watch movies. About eighty students told us they used computers to play games. Thirty-five students said they read news on the Internet. Only twenty-eight of them use their computers for study. Seven of them drew pictures by using computers. When we asked if they used computers to learn programming, only 3 students said they did.
第15-16版
2. since
3. ancient
4. keyboard
5. comfortable
6. countryside
7. touring
8. attack
9. worth 10. note
II. 1-5 ACBCA
III. 1-5 ACBBC
IV. 1. keep in touch with 2. carry around 3. places of interest
4. at the same time
5. challenged; to
6. find out
8. worked as 9. Keep off 10. be short of
II. 1. How big 2. Why are you unaware of 3. Are machines cleverer than
4. Which kind of computers are; desktops or
5. is as old as
III. 1. traffic accident 2. pouring out 3. spelling competition
4. as important as
5. has lost three mobile phones
IV. 1. Nobody knows 2. hid the treasure 3. in the 19th century
4. used to be a manager
5. one of the most popular writers
V. 1. If somebody has questions, ask me.
2. Visitors entered the museum quietly.
3. He was the winner of the singing competition.
4. She paid fifty dollars for the food in total.
II. 1. free 2. Have; seen 3. brighter 4. Millions 5. best
6. control
7. get
8. sell
9. older; poorer 10. ninth III. 1. fourteenth 2. guests 3. with 4. holding 5. bought
7. gone 8. tasty 9. because 10. themselves
6-10 BBCAC
2. interested
3. mind
4. quickest
5. improved
The third day in London
London is a city with many world-famous tourist attractions. This is our third day here.
In the morning, we went to Trafalgar Square. We fed pigeons there. Pigeons are not afraid of people there.
Then we went to Oxford Street. It was really a busy street. I bought a teddy bear for my friend in New York.
After lunch on Oxford Street, we went to visit the famous Tower of London. It’s more than 900 years old. I took many photos there.
I really had a good day today.
第17-18版
3. dust
4. includes
5. check
6. even
7. amount
8. corner
9. local 10. company
II. 1-5 ACBBC
III. 1-5 AABBC
IV. 1. slowed down 2. give a speech 3. pulled out 4. gives up
5. used to
6. belong to
7. communicating; with
9. are; full of 10. In my opinion
II. 1. No, he hasn’t 2. Do; have any suggestions for
3. as tall as
4. How many cameras have we sold
5. What do you do for
III.1. the youngest son 2. has promised 3. make similar mistakes
4. the empty basket
5. keeps in touch with
IV.1. something wrong with the main unit
2. What’s the difference between
3. don’t need to worry about
4. smoke in public
5. looking forward to hearing from you
V. 1. Have you had any fantastic experiences?
2. The carriage turned into a pumpkin at midnight.
3. Is there anything else we can do for you?
4. Lots of people lost their lives in the war.
II. 1. gone 2. fortieth 3. will punish 4. hide 5. beautiful
6. has realized
7. tell
8. stole
9. do 10. has
III.1. so 2. lived 3. from 4. serves 5. their
7. a 8. more 9. excited 10. success
2. order
3. already
4. never
5. leave
Helen is the Star of 2014 in our school.
Helen knows how to keep fit. When she is free, she often takes part in outdoor activities. She has a healthy diet and never eats junk food. She learns happily because she is interested in all her lessons and she enjoys reading. She is always a top student. Helen also loves life. She is kind and always ready to help others. For example, she always gives her seat on the bus to someone in need. When she meets problems, she always keeps smiling.
I’m sure everyone can learn a lot from her.
第19 版
寒假作业（十六）综合练习四
语法填空
（一）1. bought 2. boating 3. them 4. a 5. except
6. frightening
7. height
8. like
9. However 10. terribly （二）1. fourth 2. largest 3. than 4. making 5. Artists
6. greatly
7. without
8. including
9. named 10. an
完形填空
1-5 BABCA 6-10 CCBAB
阅读理解
1-5 CDBDB
第20版
寒假作业（十七）综合练习五
语法填空
（一）1. but 2. his 3. pulled 4. hurt 5. on
6. unhappy
7. the
8. seeing
9. quickly 10. minutes （二）1. travelled 2. a 3. opinions 4. showing 5. older
6. like
7. really
8. them
9. after 10. hearing
完形填空
1-5 BACCB 6-10 ACBCA
阅读理解
1-5 BADAD
第21-22版
综合测试（一）
1-5 CACCA 6-10 BABBA 11-15 CBACC
16. fifteenth 17. weighs 18. an 19. With 20. covers 21. by 22. intelligence 23. is 24. Including 25. highly
26-30 BAACC 31-35 ABCBC
36-40 DDCAA41-45 DBDAC
46-50 BACDA 51-55 DBACC
One possible version:
Yangtze Finless Porpoise are endangered animals. They are China’s national treasure in water.
A finless porpoise is about 120-190 cm long and weighs 100-220 kilos. Its mouth looks like smiling.
Sadly, the number of finless porpoises is getting smaller and smaller. Now there are only about 1,500 of them living in lakes and rivers. They are in danger because of people. Ships may kill them and fishermen catch them. Water pollution kills them, too.
We need to take action to save them.
第23-24版
综合测试（二）
1-5 ABABA 6-10 CCBBA 11-15 CABAA
16. invented 17. first 18. because 19. the 20. developed 21. Finally 22. heavier 23. locking 24. seconds 25. than
26-30 CBABB 31-35 ACABB
36-40 BBCAD 41-45 ABDCA
46-50 CBACA 51-55 CDBDC
One possible version:
Many of you must want something cold and tasty to drink in summer. Now you can DIY some, for example, a watermelon cooler.
To make a watermelon cooler, you need some watermelon, a cup of orange juice and 3 spoons of sugar. First of all, cut the watermelon into small pieces. Then put them into a fridge and take them out 20 to 30 minutes later. And then mix them together with the orange juice and sugar. To make the cooler nicer, you can add some ice cream in it. Now, it is finished. Put it in a glass and enjoy it!
第25-26版
综合测试（三）
1-5 BABCB 6-10 AABBA 11-15 BBACC
16. For 17. eating 18. himself 19. a 20. widely
21. However 22. realized 23. danger 24. able 25. throwing
26-30 CBACB 31-35 CBCBA
36-40 DABDC 41-45 DAADB
46-50 DCCAB51-55 BBCAD
One possible version:
Dear Dad and mum,
How is it going? I hope you are in good health. I came to China a month ago. Now I enjoy living here very much. I work and study with Chinese students. At weekends I often play different kinds of sports with them. Last week I visited many
places of interest in Beijing. They are really great! I saw the Beijing Opera yesterday and drank tea in the teahouse. I also enjoy the delicious food here. I learn more about Chinese history. Don’t worry about me. I’m fine in Beijing. I hope to see you soon.
Yours,
Mark
第27-28版
综合测试（四）
1-5 BACBA 6-10 CBAAC 11-15 CBABB
16. but 17. of 18. exciting 19. wants 20. go
21. have 22. them 23. correctly 24. winner 25. unless
26-30 BACAC 31-35 ABBAC
36-40 DBCAD 41-45 CBBDD
46-50 ABDCA 51-55 BADCA
One possible version:
Hi, Jim! I’m glad to hear from you.
You asked what my favourite school activity is. Well, I think it must be the Reading Club. In the club, we often share books with each other. And the most important is that we can discuss our ideas about these books. Reading makes me think a lot and learn a lot. It also helps me make friends more easily.
Is your school life fun? Please write back and tell me about your activities. Yours,
Li Hua
第29-30版
综合测试（五）
1-5 ABCAB 6-10 AABBA 11-15 BCACA
16. a 17. for 18. set 19. because 20. first
21. when 22. kept 23. collecting 24. her 25. educational
26-30 CBACB 31-35 ABCAC
36-40 ACCBD 41-45 DABCC
46-50 ADDCB 51-55 CAACD
One possible version:
One day, a mouse ran and ran and suddenly he hit a lion. The mouse was very a fraid. “I’m very sorry. Please let me go. I’ll help you some day.” The lion said, “Can you help me? You are too small. But I am happy now. You can go.”
Another day, the lion was in a cage and couldn’t get out. The little mouse saw him and thought a good i dea. In the end, the mouse helped the lion out. “A small one can give a big help sometimes,” said the mouse.
第31-32版
综合测试（六）
1-5 BAABA 6-10 CABAB 11-15 BCBBA
16. An 17. for 18. tries 19. became 20. different 21. With 22. developing 23. others 24. competition 25. himself
26-30 CACBC 31-35 CABAC
36-40 DCBAB 41-45 BDABC
46-50 DCBBC 51-55 BDBDC
One possible version:
My home town
My home town is a beautiful village in the north of China. It is more than 80 years old. The village changes a lot now. Houses are bigger and higher than before. And the streets are wider. There are also many new buildings. There is a river in the south of our village. The water in it is much cleaner than before. My home town is famous for its good apples. There are some clubs in the east of the village. People can do some exercise or relax after work.
Welcome to my home town.
2018八年级数学暑假作业及答案 初二暑假数学作业答案 1.已知反比例函数y=的图象经过点(3，－2)，则函数解析式为_________，x＞0时，y随x的增大而_________. 2.反比例函数y=的图象在第_________象限. 3.直线y=2x与双曲线y=的交点为_________. 4.如图1，正比例函数y=kx(k＞0)与反比例函数y=的图象相交于A、C两点，过A作x轴的垂线交x轴于B，连结BC，则△ABC的面积S=_________. 二、选择题
5.在双曲线y=－上的点是（） A.(－,－) B.(－,) C.(1,2) D.(,1） 6.反比例函数y=(m－1)x，当x＜0时，y随x的增大而增大，则m的值是（） A.－1 B.3 C.－1或3 D.2 7.如图2所示，A、B是函数y=的图象上关于原点O对称的任意两点，AC∥x轴，BC∥y轴，△ABC的面积为S，则（） A.S=1 B.S=2 C.1＜S＜2 D.S＜2 8.已知反比例函数y=的图象上两点A(x1，y1)，B(x2，y2)，
当x1＜0＜x2时，有y1＜y2，则m的取值范围是（） A.m＞0 B.m＞ C.m＜0 D.m＜ 9.若(x1，y1)，(x2，y2)，(x3，y3)都是y=－的图象上的点，且x1＜0＜x2＜x3.则下列各式正确的是（） A.y1＞y2＞y3 B.y1＜y2＜y3 C.y2＞y1＞y3 D.y2＜y3＜y1 10.双曲线y=－经过点(－3，y)，则y等于（） A.B.－C.6D.－6
11.当梯形上、下底之和一定时，梯形的面积与梯形的高的函数关系是（） A.正比例函数 B.反比例函数 C.二次函数 D.都不是 12.如果反比例函数y=的图象经过(－，1)，那么直线y=k2x －1上的一个点是（） A.(0，1) B.(，0) C.(1，－1) D.(3，7) 13.已知点(1，a)在反比例函数y=(k≠0)的图象上，其中 a=m2+2m+5(m为实数)，则这个函数的图象在第_________象
What’s the main idea of the passage? ________ A.John Snow was a well-known doctor in London. B.The cause of Cholera was polluted water. C.The source of all drinking water should be examined. D.How did John Snow collect, analyze data and find the cause of the disease and solved it . II.根据课文内容总结出各段段落大意并在空格处填上适当的单词，每空一词。
III.仔细阅读课文，找出下列句子并分析。 1. John Snow was a famous doctor in London— so expert, indeed, that he attended Queen Victoria as her personal physician. ①划分句子成分：____________________；attend, join, join in和take part in 的区别： ____________________________________________________________ ___________________ ②此句中so…that 引导_______ 从句，仿写句子：她对这篇文章太熟
了，以至于能全文背诵。 ____________________________________________________________ ___________________ 2. But he became inspired when he thought about helping ordinary people exposed to cholera. ①划分句子成分：______________________________________ ②此句中inspired 和exposed各在句中作_____ 和______(成分); expose to意思是__________, 其后常接________ 形式。翻译：我不想向任何人揭露他的恐惧。___________________________________________________________ __________________ 3. The second suggested that people absorbed this disease into their bodies with their meals. ①划分句子成分：______________________________________ ②句中absorb…into意思是__________, be absorbed in/ into本意是_________，还有使全神贯注的意思;例如：He was so absorbed into the novel that he couldn’t hear the door bell 。翻译：____________________________________________________________ ___________________ ③比较：Para7中suggest的用法与此句中的一样吗？ ____________________________________________________________ ___________________
八年级上册学英语报纸答案八年级上册学英语报纸答案 【篇一：八年级下册英语报纸答案】 txt>1. what ' s lily playing? 2. how many kites does bob have? 3. what are they doing to raise mon ey? 4. what job is ala n in terested in? 5. which is ellen ' s favourite snow globe? 二.听小对话，选择正确的答案（10% ） 听第一段对话，回答6-7小题。 6. when is alan ' s birthday? a. march. 3rd b. march 13th. c. march 20th. 7. how will ala n celebrate his birthday? a. have a try b. go out for dinner. c. see a film
听第二段对话，回答8-10小题。 8. where is the new sports cen tre? a. on straight road b. on long street. c. beside the school 9. what sport can people play at the sport cen tre? a. basketball b. volleyball c. swimmi ng 10. how much should you pay for a year-ticket if you are 18? a. 40 yua n b. 50 yua n c. 60 yua n 三、听独白，完成信息表（10%）
八年级深圳（S）寒假版第1版 寒假作业（一）词汇与句型篇 词汇运用 I. 1. ability 2. include 3. win 4. promise 5. double II. 1. musician 2. traffic 3. chess 4. rest 5. born
III. 1-5 CBAAB IV. 1. and so on 2. found out 3. copy down 4. go for a walk 5. challenge; to 句型演练 I. 1-5 CABBB II. 1. is famous for 2. promised to buy 3. Since then
4. follow his father’s advice 5. go for a walk III. 1. Joy won a prize for her new invention. 2. This book is not as interesting as you think. 3.Kathy’s job includes typing letters and answering the phone. 4. Some like living in the countryside but others
don’t. 5. Human beings showed their great intelligence a long time ago. 第2版 寒假作业（二）语法篇语法专练 I. 1-5 CCBAB 6-8 ABC II. 1. anything; nothing 2. Fiftieth
学英语报答案 篇一：学英语报纸12期答案 第二版 同步课堂 Unit 1 1 connect; to 2 C 3 B 4 to dray mother ary’s Ⅲ. 1. came 2. him 3. joined 4. Their 5. sent 6. y favorite star is Jackie Chan. He is a great actor. I like him very much. I think his movies are exciting and he is a friendly movie star. Most of his movies are very successful action movies. I like his movies best. Jackie Chan is one of the most popular stars in the ay. B. In March. C. In November. D. In September. 8. A. $30.B. $ 300. .C. $60.D. $ 600. 9. A. Because it's funny.B. Because it’s exciting. C. Because it’s scary. D. Because it’s sad. 10. A. Never. B. Every day. C. Once a ike Green is a special artist. 16. He is from America.
17. He can create art any students c from poor families and they ______ afford school lunches, so the government is trying to help them. A. needn’t B. shouldn't C. can’t D. mustn’t 27. China plans to let tourists ______ the Xisha Islands in the South China Sea this year. A. visit B. visits C. visiting D. visited 28. I asked ti Green an hour to fix up his bicycle yesterday. A. cost B. paid C. spent D. took 30. Breakfast is ______ meal of the day. It provides us r Miller agrees. “It is a41 r Miller noost importantly, I45the classroom. This, of course, r Mendel discovered ost people hope that this r Mendel discover ake better medicine.B. Make them get jobs. C. Make maps for them. D. Make them attractive. 54. e. B. ovie with? C. Yes, you are right D. How wonderful the movie was! E. obile phones. G. So the movie was boring, wasn’t it? (三) 阅读短文，完成第II卷第五大题的66~70小题，
2020八年级寒假数学试题及答案_初二数学寒假作 业 八年级寒假数学试题及答案 一、选择题 1.下列四个说法中，正确的是() A.一元二次方程有实数根; B.一元二次方程有实数根; C.一元二次方程有实数根; D.一元二次方程x2+4x+5=a(a≥1)有实数根. 【答案】D 2.一元二次方程有两个不相等的实数根，则满足的条件是 A.=0 B.>0 C.<0 D.≥0 【答案】B 3.(2010四川眉山)已知方程的两个解分别为、，则的值为 A.B.C.7D.3 【答案】D 4.(2010浙江杭州)方程x2+x–1=0的一个根是 A.1– B. C.–1+ D. 【答案】D
5.(2010年上海)已知一元二次方程x2+x─1=0，下列判断正确的是() A.该方程有两个相等的实数根 B.该方程有两个不相等的实数根 C.该方程无实数根 D.该方程根的情况不确定 【答案】B 6.(2010湖北武汉)若是方程=4的两根，则的值是() A.8 B.4 C.2 D.0 【答案】D 7.(2010山东潍坊)关于x的一元二次方程x2-6x+2k=0有两个不相等的实数根，则实数k的取值范围是(). A.k≤ B.k< C.k≥ D.k> 【答案】B 8.(2010云南楚雄)一元二次方程x2-4=0的解是() A.x1=2，x2=-2 B.x=-2 C.x=2 D.x1=2，x2=0 【答案】A 9.(2010云南昆明)一元二次方程的两根之积是() A.-1 B.-2 C.1 D.2 【答案】B 10.(2010湖北孝感)方程的估计正确的是() A.B. C.D. 【答案】B
2020暑假作业八年级数学答案数学天地一 一、1-5、CDAAC 6-10、DDBDC. 二、11.x≥-0.5且x≠1;12、2-√3 2-√3;13、-3;14、4.5; 15、(1)原式=4-(√48÷3+√12÷3)=4-(4+2)=-2 (2)原式=(√5)²-(√2)²-(3-2√6+2)=3-3+2√6-2=2√6-2 (3)原式=√x-√x=0. (4)原式=1.5ab√3a 16.原式==(x+1-2)²=(x-1)² ∵ x-1=√3 ∴原式=(√3)²=3 17.由图可知、a为正数且大于1小于2.∴原式=a-1-(a-2)=1 18.原式=2/xy 将x=2，y=3代入得2/xy=2/2√3=√3/3 19.(1)根据勾股定理、 C=√a²+b²=(2√3+1)²+(2√3-1)²=√26. (2)。S△=½(2√3+1)(2√3-1)=5.5 数学天地二 1-10.BCDCB 6-10BBBDA 11.5; 12.√2a; 13.8√5; 14.12或7+√7 15.
2020八年级暑假作业答案：数学（南方日报出版社） 2020八年级暑假作业答案：数学（南方日报出版社） 16. ：△BMP为直角三角形， 且由题意知BM=8×2=16，BP=15×2=30， 由勾股定理得， 故MP2=162+302=256+900=1156， 即MP=34海里. 答：P岛与M岛之间的距离为34海里 17. 2020八年级暑假作业答案：数学（南方日报出版社） =12.5;周长=3√5+3√2+√13 (2)不是 18. 2020八年级暑假作业答案：数学（南方日报出版社） 数学天地三 1-5.DAAAA 6-10BDCBA 11.125; 12.1.2; 13.7;32; 14.8 15.∵是平行四边形，∴∠BAD ∠ADC互补， ∵AE平分∠BAD ，∠ADC的平分线平分∠ADC∴∠ADO与∠DAO互余 ∴∠AOD是90度所以DO垂直于AE， 又∵∠ADO与∠CDO相等，∠AOD等于DOE等于90度且DO等于DO∴三角形ADO与三角形DOE全等，
八年级深圳（S）寒假版 第1版 寒假作业（一）词汇与句型篇 词汇运用 I. 1. ability 2. include 3. win 4. promise 5. double II. 1. musician 2. traffic 3. chess 4. rest 5. born III. 1-5 CBAAB IV. 1. and so on 2. found out 3. copy down 4. go for a walk 5. challenge; to 句型演练 I. 1-5 CABBB II. 1. is famous for 2. promised to buy 3. Since then 4. follow his father’s advice 5. go for a walk III. 1. Joy won a prize for her new invention. 2. This book is not as interesting as you think. 3. Kathy’s job includes typing letters and answering the phone. 4. Some like living in the countryside but others don’t. 5. Human beings showed their great intelligence a long time ago. 第2版 寒假作业（二）语法篇 语法专练 I. 1-5 CCBAB 6-8 ABC II. 1. anything; nothing 2. Fiftieth 3. nobody 4. eighth; Eight 5. anybody; nobody 6. multiply 7. everything 8. hundred III. 1. isn’t anything new 2. doesn’t know anything 3. divided by; equals 4. there’s nothing 5. What’s IV. 1. Nothing is difficult 2. Millions of 3. haven’t called anyone 4. plus; equals/is 5. was born; May the fourth V. 1. B special something 改为something special 2. C make改为makes 3. A hundreds 改为hundred 4. A multiplies 改为multiplied 5. B three 改为third VI. 1. a 2. her 3. spent 4. unluckily 5. because 6. after 7. death 8. thirteenth 9. hiding 10. millions 第3版 寒假作业（三）读写综合篇 语法填空 1. prizes 2. youngest 3. for 4. showing 5. when
新人教版八年级数学暑假作业答案 丰富的学习生活对自己的帮助非常大，接下来就是查字典数学网初中频道为大家提供的八年级数学暑假作业答案，希望会对大家的学习带来帮助! 《暑假乐园》十一答案 一选择题1~10 CDBDABDCCA; 二填空题11. 0.3 ; 12.X0且X9 13 .-m 14.X1 15. 18 17.3 18. 相等19.1 20. 三解答题21(1) X (2)a (3)m取一切数(4)x0 22化简(1)156 (2)-5 (3) (4) 23(1) (2) (3) (4) (5) (6) 24 X 且X1 25. -1 26.(1) (2) (3) 《暑假乐园》(十二)答案： 1-13、ACBBBBDCDABBC;14、x15、;16、，7;17、30 ;18、219、6，- ;20、21、-2a ;22、5,1;23、( x+ )( x+ );24、5 = ，n = ;25、(1)-24 ;(2)1;(3)4 - +2;(4) ;26、(1)10+12 +4 ;(2)18;27、倍;28、4;29、(1)2 - ;(2) -1。 暑假乐园(13)答案： 基本概念：1、离散，2、极差，3、最大值，最小值，4、大，小，一致， 作业：1、497 3850，2、32, 3、-8, 4、-2或8, 5、4, 6、D，7、D，8、30 40，9、13, 10、16 《暑假乐园》十四
一，知识回顾 (1)平均数A:40.0 B ：40.0 极差A.4 B:0.4(2)不能 二，基本概念，略 三，例题分析：方差，A:0.012 B:0.034 标准差，略A更稳定 四，作业：(1)B (2)B (3)C (4)8 (5) 200,10 (6)100 (7)方差：甲0.84 乙0.61 所以乙更稳定 暑假乐园(十五) 1、12; 2、①，②，③; 3、2 ; 4、; 5、2，; 6、100; 7、乙; 8、乙; 9、4、3; 10、0;11、C;12、C;13、C;14、D;15、B; 16、A;17、B; 18、C;19、C;20、C;21、(1)A：极差8，平均数99，方差6.6;B：极差9，平均数100，方差9;(2)A; 22、(1)甲组及格率为0.3，乙组及格率为0.5，乙组的及格率高;(2)甲组方差为1，乙组方差为1.8，甲组的成绩较稳定;23、(1)甲班的优秀率为60℅，乙班的优秀率为40℅;(2)甲班的中位数为100，乙班的中位数为97;(3)估计甲班的方差较小;(4)根据上述三个条件，应把冠军奖状发给甲班。 暑假乐园(十六) 一、选择题(本大题共10小题，每小题3分，共30分) 题号1 2 3 4 5 6 7 8 9 10 答案C B A A B D C C B D 二、填空题(本大题共8小题,每题4分,共32分)
八年级下册英语报答案 【篇一：八年级英语(下册)参考答案】 据汉语意思，完成句子。一空一词。 1.will be on 2.there be more less 3.think thererobots 4.won’t camping will 5.will in won’t 【拓展练习】 一、单项选择 1-5 b b a c b 【课题】 unit1 section a 3a-4 【课堂练习】 一、用括号内所给词的适当形式填空。 1.won’t have 2.will write 3.is going to rain 4.is reading 5.are dancing 6.didn’t visit stayed did 7.will be 8.is going to be 9.going 10.will be 【拓展练习】 一、单项选择。 1-7 b c a d b c b 【课题】 unit1 section b 1 a-2 c 【课堂练习】 一、汉译英： 1.i will be a doctor in ten years. 2.what sport will you play? 3.i work near here. 4.where do you live? i live in an apartment. 5.i think there will be more high buildings. 【拓展练习】 一、单项选择填空。 1-7 c b b b d d b 二、句型转换 1.won’t live 2.will study 3.will be 4.when will go 5.don’t think will 6.no, they won’t 7.will there be 8. will be 【课题】 unit1 section b 3a-4 【课堂练习】 一、选词填空。 1.won’t credit card 2.fewer 3.predictions ture 4.won’t study 【拓展练习】 一、阅读练习：
英语周报广州版2011-2012学年（上） 九年级基础版第十二期参考答案 第1版 《事事关心》 1. Because many people cut down a large number of trees for wood and farmland. 2. deserts, hot and dry, hard 《课文链接》 1. To draw the right conclusion from the failing. 2. After you have tried it. 第2版 《短语收藏夹》 一、 1. put, right 2. In the case of 3. look out of 4. get into bad habits 5. makes an effort to 6. work out 7. is to blame for 《课文点滴》 1. in the case of 2. belongs to 3. advised, to work 4. prevent/stop, from cutting 5. focus on 《语法梳理》 (A) -er, more, -est, (the) most, better, best, worse, worst, less, least, more, most, farther/further, farthest/furthest 【自测题】 1. beautifully 2. later 3. the most wonderfully 4. carefully, more carefully, (the) most carefully 5. early 【梳理】 1. as+副词原级+as 2. 副词的比较级+than 3. (the)+副词最高级 4. as+副词原级+as possible/sb can 【巩固练习】 一、 1. faster, fastest 2. more gracefully, most gracefully 3. higher, highest 4. more frequently, most frequently 5. more strongly, most strongly 6. more carefully, most carefully 7. earlier, earliest 8. harder, hardest 9. more quickly, most quickly 10. more slowly, most slowly 二、 1. as high as 2. the hardest 3. as confidently as 4. as soon as possible (B) 【自测题】 1. shall we 2. were they 3. can it
初二数学寒假作业(1) 一、精心选一选 ⒈下列各组条件中,不能判定△ABC 与△DEF 全等的是 ( ) A. AB=DE ，∠B=∠E ，∠C=∠F B. AC=DF ，BC=DE ，BA=EF C. AB=EF ，∠A=∠E ，∠B=∠F D. ∠A=∠F ，∠B=∠E ，AC=EF ⒉判定两个三角形全等必不可少的条件是 （ ） Ａ.至少有一边对应相等 B ．至少有一角对应相等 C ．至少有两边对应相等 D ．至少有两角对应相等 ⒊在△ABC 和△DEF 中，已知AB=DE ，∠A=∠D ，还需具备什么条件①AC=DF ；②BC=EF ；③∠B=∠E ；④∠C=∠F ，才能推出△ABC ≌△DEF ，其中符合条件有 （ ） A 、1个 B 、2个 C 、3个 D 、4个 二、细心填一填 ⒋ 如图1，AO 平分∠BAC ，AB=AC ，图中有__________________对三角形全等. ⒌ 举例说明三角形稳定性在生活中的应用:_______________________________. ⒍ 如图2，在△ABC 中，∠C=900 ，AD 是∠BAC 的平分线，交BC 于D ，BC=16，DC ：DB=3：5，则点D 到AB 的距离是___________. 三、用心做一做 ⒎如图,已知AD=AE,AC=AB,∠A=400 , ∠B=350 ,求∠EOC 的度数 ⒏.如图，已知∠1=∠2,∠3=∠4,AB 与CD 相等吗？请你说明理由. 图1 A C D O E B A 图2 B C
初二数学寒假作业(2) 一、精心选一选 ⒈下列说法中正确的是 ( ) Ａ.三个角对应相等的两个三角形全等. B ．面积相等的两个三角形全等. C ．全等三角形的面积相等. D ．两边和一角对应相等的两个三角形全等. ⒉在ΔABC 和ΔA ′B ′C ′中，AB=A ′B ′，∠B=∠B ′，补充一个条件后仍不一定能保证ΔABC 与ΔA ′B ′C ′全等，则补充的这个条件是 ( ) A ．BC=B ′C ′ B ．∠A=∠A ′ C ．AC=A ′C ′ D ．∠C=∠C ′ ⒊在△ABC 和ΔA ′B ′C ′中，AB= A ′B ′ ，∠A=∠A ′，∠C=∠C ′ ,可推出(1)∠B=∠B ′；(2)∠B 的平分线与∠B ′的平分线相等；(3)BC 边上的高与B ′C ′边上的高相等；(4) BC 边上的中线与B /C / 边上的中线相等.其中正确的结论有 ( ) A. 1个 B. 2个 C. 3个 D. 4个 二、细心填一填 ⒋如图1： 在ΔABC 和ΔADC 中，下列三个论断：⑴AB=AD ，⑵∠BAC=∠DAC ，⑶BC=DC ，将其中两个论断作为条件，另一个论断作为结论，请你写出一个正确的推断： ⒌如图2,在ΔABC 与ΔAED 中，AB=AE ，AC=AD ，请补充一个条件条件：____________(写一个即可)，使Δ ABC ≌ΔAED. ⒍如图3，在ΔABC 中，∠C=900，AC=BC ，AD 平分∠CAB ， 交BC 于D ，DE ⊥AB 于E ，且AB=6cm ，则ΔDEB 的周长为________. 三、用心做一做 ⒎如图，AC=BD ，AC ⊥AB ，DB ⊥CD ，则AB 与DC 相等吗？为什么？ C B A 图3
八年级上册学英语报纸答案
八年级上册学英语报纸答案 【篇一：八年级下册英语报纸答案】 txt>1. what’s lily playing? 2. how many kites does bob have? 3. what are they doing to raise money? 4. what job is alan interested in? 5. which is ellen’s favourite snow globe? 二. 听小对话，选择正确的答案（10%） 听第一段对话，回答6-7小题。 6. when is alan’s birthday? a. march. 3rd b. march 13th. c. march 20th. 7. how will alan celebrate his birthday? a. have a try b. go out for dinner. c. see a film 听第二段对话，回答8-10小题。 8. where is the new sports centre? a. on straight road b. on long street. c. beside the school 9. what sport can people play at the sport centre? a. basketball b. volleyball c. swimming 10. how much should you pay for a year-ticket if you are 18? a. 40 yuan b. 50 yuan c. 60 yuan 三、听独白，完成信息表（10%）
学英语报社报纸答案 九年级学英语报答案 一、听力测试（共20小题，计25分) 注意：听力测试分四部分，共25小题。做题时，先将答案画在试卷上，录音内容结來后, 将所选答案转涂到答题卡上。 (一) 听句子，选择与句子内容相对应的图片，每个句子读两遍， 请看第一组的四个图片，听每个句子，完至第3小题。 1. ________ 2. ________ 3. ________ 请看第二组的四个图片，听三个句子，完成第4至第6小瓶， 4. ________ 5. ________ 6. ________ (二) 听对话和问题，根据所听内容，选择最佳答案。对话和问题都读两遍。 7. A. In May. B. In March. C. In November. D. In September.
8. A. $30.B. $ 300. .C. $60.D. $ 600. 9. A. Because it's funny.B. Because it’s exciting. C. Because it’s scary. D. Because it’s sad. 10. A. Never. B. Every day. C. Once a week.D. Twice a week. 11. A. Jack.B. Sam. C. Bob. D. Tom. 12. A. Clean the living room and the kitchen. B. Sweep the floor and take out the trash. C. Clean the kitchen and take out the trash. D. Sweep the floor and clean the living room. 13. A. A hamburger and French fries. B. A hamburger and ice cream.
八年级上册数学寒假作业答案 【第1~3页】 一、计算 1、解：因为三角形ACF全等于三角形DBE。所以AD-BC=DC-BC。即AB=CD。 因为AB+CD+BC=AD所以AB=(11-7)÷2=2 2、解：设∠BEF和∠FEM为X,则∠CEN和∠NEM为2X，得 X+X+2X+2X=180所以∠FEM+∠NEM=∠FEN;6X=180所以∠FEN=30+60=90X=30 二、填空 1~82相反数正负7负当a三、略四、AB五、解答(自己画) 【第4~6页】 一、CDAD二、连第2个三、略四、B五、略 六、选A画上去七、解：2X-3分之2X-2=-X+31又3分之2X+X=53分之8X=5X=8分之15 【第7~9页】 一、略二、DAD三、四、略 五、1、解：20-Y=-1.5Y-2-2.5Y=-22Y=5分之44 2、解：7X+6X-6=2013X=26X=2 3、解：8X-9X-6=6-X=12X=-12 六、三角形：100×4=400(块)花行：50÷0.5=100(块)
七、1连22连43连54连15连3(左边为1到5右边也是1到5别混啦) 【第10~12页】 一、1、502、解：因为∠BAC+∠B+∠C=180所以∠BAC=180-30-40=110因为∠BAC=∠B’A’C’=110所以∠CAB’=∠BAC+∠B’A’C’-1803、B4、C二、略 三、都是以顺时针的方向旋转90°四、-2ab带入得-1 五、因为三角形ABC全等于三角形DEF所以DF=AC=35kg 六、略 七、πx h=2πx +3πx hπx -3πx =2πx h-3=2πx h=5πx 【第13~15页】 一、略二、BACD三、画尺规做图画出角平分线然后利用比例尺标出 四、1、25b-(b-5)=2925b-b+5=2924b=24b=1 2、9y-3-12=10y-14-y=1y=-1 3、=-X+2X的平方+5+4X的平方-3-6X=-7X+6X +2 4、=3a的平方-ab+7+4a的平方-2ab-7=7a的平方-3ab 五、解：因为三角形ABC全等于三角形ADE所以∠D=∠B=25 因为∠EAD+∠D+∠E=180所以∠EAD=180-25-105=50 【第16~18页】 一、1、C因为有无数条对称轴2、C因为C的折线与a折线是平行的
八年级寒假作业数学答案 2016八年级寒假作业数学答案 第1页—第3页 1.选择题 1A2D3A4C 2.填空 (1)T=20-6h20,6Thh (2)Q=6x105-pt6x105pQt0≤t≤6x105/p (3)S=1.5b(4)0≤x≤70≤y≤550 3.解答题 (1)y=Q/a-x–Q/a(0≤x≤a) (2)y=80-2x 20(3)①-2≤x≤3 ②当x=3,y有最小值为1/2 ③当-2≤x≤0，y随x的增大而增大，当0≤x≤3，y随x的增大而减小 (4)①`v=800-50t ②0≤t≤16 ③当t=8时，v=800-50x8=400 ④当v=100时，100=800-50t
第5页—第7页 选择题 1B2C3C4B5B6A7B8D 填空 (1)1(2)y=2x+1-1(3)m<2n<3(4)y=-3x+3 (5)y=x+3(6)y=64x+48(7)S=2n+1(8)y=1/5x-630解答题 (1)设y=kx+b -4k+b=15 6k+b=-5 k=-2b=7 y=-2x+7 (2)略 (3)①表示y与x的关系，x为自变量 ②10时离家10km13时离家30km ③12时-13时，离家30km ④13km ⑤2时-13时 ⑥15km/h 第9页—第11页 1.选择题 (1)A(2)C(3)C
(1)y=-2x(2)m<2(3)y=5x+3(4)y2>y1(5)y=-2x+10025(6)9 3.解答题 (1)①Q=200+20t②(0≤t≤30) (2)①y=80(0≤x≤50) y=1.9x-15(50≤x≤100) ②y=1.6x ③选择方式一 (3)①在同一直线上y=25/72x ②当x=72时，y=25 当x=144时，y=50 当x=216时，y=75 y=25/72x(0≤x≤345.6) ③当x=158.4时，y=25/72x158.4=55 (4)①y甲=2x+180 y乙=2.5x+140 ②当x=100时，y甲=200+180=380 Y乙=140+250=390 380〈390 租甲车更活算 第13页—第15页 1.选择题 (1)D(2)C(3)C
英语周报广州版2011-2012学年（下） 八年级基础版第三十二期参考答案 Unit 2 单元综合能力检测题 参考答案 一、第一节：1—5 CBABA 6—10 CBBAA 11—15 ABCAB 第二节： A. Japan B. 1969 C. TVD. 1,300 E. happy 二、第一节：16—20 BDCAA 21—25 DDCCB 第二节：26—30 BDCAC 31—35 CCABB 三、36—40 BDCAB 41—45 BDDDC 四、46—50 CDCBA 51—55 BDCDA 56—60 ADCBA 61—65 CABAA 五、第一节：66. plenty 67. frightened 68. though 69. joke 70. careless 第二节：71. run around 72. set out 73. gets, into trouble 74. is in good condition 75. was delighted with 第三节：One possible version: My foreign teacher Frank Miller is our new foreign teacher. He comes from the UK. Frank teaches us spoken English. He is very tall and thin with white skin and big eyes. He is kind and friendly and has a good sense of humor, so we are very happy in his class. And he knows so many things that we can learn a lot from him. Also, he likes doing sports, and he often plays football with his students. Besides, he is good at playing the piano. We all like him very much. 第2版参考答案 《词语点击》 forecast 【结论】可数名词，及物动词 【运用】 1. Who can forecast what the writer will do next 2. No one can forecast traffic accidents. 3. What does the forecast say about tomorrow’s weather light 【结论】光线，灯，形容词，及物动词，不及物动词 【运用】 1. The last person to leave should turn off the light. 2. I bought a light suitcase.
寒假作业八年级数学下册假期预习导学案 学习目标 1.经历探索.猜想.证明的过程，进一步发展推理证明意识和能力. 2.能够证明线段垂直平分线的性质定理.判定定理. 3.能够用尺规作已知线段的垂直平分线. 一.温故 1.什么是线段的垂直平分线？你会画线段的垂直平分线吗？ 2.线段的垂直平分线有什么性质？ 二.知新 线段的垂直平分线上的点到这条线段的两个端点的距离相等”你能证明这一结论吗？ 已知： . 求证：PA=PB 【分析：要想证明边相等，考虑证它们所在的三角形全等】 总结： 想一想： 你能写出“线段的垂直平分线上的点到这条线段的两个端点的距离相等”这一命题的逆命题吗？它是真命题吗？如果是，请证明. 逆命题： 已知： M P A B C N M C
求证： 总结： 做一做：用尺规作出已知线段AB的垂直平分线CD 自学课本27页，完成作图 A B 例题解析： 如图在△ABC中，AD是∠BAC平分线,AD的垂直平分线分别交AB.BC延长线于F.E 求证：【1】∠EAD=∠EDA ; 【2】DF∥AC 【3】∠EAC=∠B 三.达标 1.已知：线段AB及一点P，PA=PB，则点P在上. 2.已知：如图，∠BAC=1200,AB=AC,AC的垂直平分线交BC于D 则∠ADC= 度 3.△ABC中，∠A=500，AB=AC,AB的垂直平分线交AC于D则∠DBC的度数 . 4.如图，△ABC中，AB=AC=17,BC=16,DE垂直平分AB， 则△BCD的周长是多少？
5.有特大城市A 及两个小城市B.C ，这三个城市共建一个污水处理厂，使得该厂到B.C 两城市的距离相等，且使A 市到厂的管线最短，试确定污水处理厂的位置. 四.课后练习 1、如图，已知AB 是线段CD 的垂直平分线，E 是AB 上的一点， 如果EC=7cm,那么ED= cm ；如果∠ ECD=600， 那么∠EDC= ∠B=300 2、如图，在△ABC 中，已知AC=27，AB 的垂直平分线交AB 于点E ，交AC 于点D ， △BCD 的周长等于50， 求BC 的长. 寒假作业 1.3线段的垂直平分线【2】 完成时间 2月13日 学习目标 1.能够利用直尺和圆规作已知线段的垂直平分线； 2.能够证明线段的垂直平分线相交于一点这一定理. 3.已知底边及底边上的高，能够利用直尺和圆规作出等腰三角形. 一.温故 1.等腰三角形的顶点一定在 上. 2.已知线段AB ，请你用尺规作出它的垂直平分线.A B A E C D B