2017玉林、崇左中考英语真题及答案

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2017广西中考英语模拟真题及答案

2017广西中考英语模拟真题及答案2017广西中考英语模拟真题及答案52. What can we learn from Dana?A. We should get along well with others.B. We should offer help to people in need.C. We should go aboard the plane on time.D. We should call for help in the right way.CTeachers say that the digital(数字)age has had a good influence and a not-so-good influence on American teenagers. More than 2,000 middle and high school teachers took an online survey. Researchers also spoke with teachers in some groups. Most teachers think the Internet and digital search tools have had a mostly positive influence on their students’ research habits and skills. But at the same time, some teachers also point out some problems in teenager s’ using digital search tools.The Pew Internet Project did the survey with the College Board and the National Writing Project. Judy Buchanan is the director of the National Writing Project and a co-writer of the report. She says digital research tools are helping students learn more, and learn faster. “Both teachers and students really welcome these tools because they make learning exciting. And the goal is to really help students become creators of something meaningful, and not just users of the online in formation.”But one problem the survey found is that these technologies make teenagers have short attention spans(持续时间). As there is huge amount of information about different subjects on the Internet, teenagers’ attention is easily drawn away from their research.Another problem the survey found is that many students trust the information they find on the Internet too much. Judy Buchanan says these students have not developed the skills to judge the online information. They need to learn a lot to tell if t he information is believable. It’s something that really has to be paid attention to.One more problem the survey found is something that might not seem like a problem at all: being able to quickly find information online. Many students think “doing research” now means just doing a quick search on Google. Teachers say the result is a drop in the wish and ability of their students to work hard to find answers. That is, they are overly dependent on search engines and do not make enough use of printed books or research librarians.Many teachers also say that the Internet makes it easy for students to copy work done by others instead of using their own abilities.53. The result of the survey shows ______.A. digital search tools need to be greatly improvedB. digital search tools are generally good for teenagersC. teenagers have difficulty in using digital search toolsD. American teachers enjoy using digital search tools54. Using digital search tools makes teenagers ______.A. less trusting of online informationB. more independent in doing researchC. more willing to work hard to find answersD. less able to pay full attention while searching55. To do better in research, teenagers should _______.A. spend more time searching onlineB. ask their teachers for more adviceC. make better use of printed materialsD. learn more knowledge of search toolsDAre you a good receiver? It might sound like a funny question but it is an important one that each of us should ask ourselves.Strangely, most of us are better givers than receivers. We give to our family, our friends and even charities, and opposite to what we might think, most of us are actually very good at giving. But receiving is another matter. We often feel a little uneasy when receiving, although it is not very noticeable. Even praise gets deflected(转向)when it comes our way. When someone praises us for helping him move or clean up the house, we will possibly say, “Ah, it was nothing.” When someone praises the coat we are wearing, we may mention how we bought it at a discount instead of simply enjoying the praise. Actually, the praise is a gift to us, and when we don’t receive it properly, we are dishonoring the giver.Giving is easy, as there is much pleasure in giving, but receiving is an art that takes practice. To be a good receiver requires a sense of close relationship with the giver. It is always a pleasure for a giver to see the gift received in a pleasant way. And this is also the best way for a receiver to honor the giver and give him something back.Many relationships are not so good not because people are not giving to each other, but because they are not receiving from each other well. We should receive the love, respect the praise, and give thanks every time giving happens. We should practice receiving all the pleasures that happen to us every day, instead of taking them for granted. Think of how many simple everyday gifts we are being given all the time: the beauty of nature, art andinspiring(激励人的)conversations. But are we truly receiving them when they happen to us, or are we busy with other matters, not noticing? We should master the art of receiving: accept the gifts life offers us and show our appreciation for them.We are taught that it is better to give than to receive. But this suggests that there is something wrong with receiving. There is nothing wrong with receiving. It is better to give and receive. Let life shower us with gifts, pleasures, joys, surprises, both large and small, and let us take notice of all these things and accept them happily and thankfully. The more we can receive, the more we can give back, but giving more does not necessarily mean receiving more. We must remember it is harder to receive than to give, and try to practice receiving. This practice will benefit us greatly, making us become good receivers as well as good givers.56. According to Paragraph 2, what do we possibly do when we are praised? 新课标第一网A. Honor the giver publicly.B. Show our pleasure clearly.C. Receive the praise uncomfortably.D. Express our disagreement properly.57. The expression “taking them for granted” probably means “_______”.A. looking for them with expectationB. depending on them with satisfactionC. getting away from them without regretD. benefiting from them without appreciation58. What can we learn from the passage?A. People usually can receive more by giving more.B. People usually try to receive as much as possible.C. People should give a gift back when receiving one.D. People can improve relationships by receiving well.59. What is the best title for the passage?A. Be a Good Receiver and GiverB. Better to Give Than to ReceiveC. Better to Give, Better to ReceiveD. Be a Receiver Rather Than a Giver七、阅读短文，根据短文内容，从短文后的五个选项中选出能填入空白处的最佳选项。

2017广西中考英语模拟试卷及答案

2017广西中考英语模拟试题一、听力理解(共两节，20小题，计20分)第一节 (共5小题;每小题1分，计5分)听下面5段对话，根据所听到的内容，选择相应的图画。

听每段材料前，你将有时间阅读各个小题，每小题5秒钟。

听完后，各个小题将给出5秒钟的作答时间。

1. W: Hello! Tom .What are you going to do ?M: I am going to play basketball.2. W: Peter , our exam is going t o be held on Wednesday, isn’t it ?M: Yes, you are right! It is on Wednesday.3. W: Have you found your notebook, Peter ?M: Yes, it was in my schoolbag.4. W: Is it raining outside, Mike?M: Hmm, let me see. No, it’s sunny.5. W: How many subjects do you study ?M: Seven. Among all of them I like English best.第二节 (共15小题;每小题1分，计15分)听下面的对话或独白，每段对话或独白后有一个或几个小题，从题中所给的A、B、C三个选项中选出符合对话内容的最佳选项。

听每段材料前，你将有时间阅读各个小题，每小题5秒钟。

听完后，各个小题将给出5秒钟的作答时间。

听下面的对话，回答第6小题。

6. W: Excuse me, Baker. How often do you go home?M: Three ti mes a week .听下面的对话，回答第7小题。

7. W: How long does it take you to get to school, John?M: It takes me about 20 minutes to walk.听下面的对话，回答第8小题。

广西玉林市、贵港市2017届高中毕业班质量检测英语试题答案

请听第九段对话，回答第 13 至第 16 四个小题。现在你有 20 秒钟的时间来阅读这四个小题。停顿 00’20” 哗— Text 9 M: Do you remember that party last year, Mary? W: No. Which one? M: David’s friend’s party in that big house. W: Oh, yes, Tom! I remember. It was really far away, and you said you knew the way, so we didn’t
with your mother when BAM! She was gone. We looked all over for her, and finally we saw her by the hippos. M: What was she doing? W: She was just looking at them. She started asking questions about hippos, and we couldn’t answer most of them, so she ran off again to find a zookeeper! M: Ha! It sounds like she really wanted to know more about those hippos! W: You have no idea! When we got home, she told me she wanted to go to the library and check out some books about hippos. So, we got her some books, and when she was done with them, we got her some more. She spent that whole month learning about hippos. M: Wow. I want to be just like my mom. 停顿 00’02” 重复停顿 00’15” 哗—

新疆2017年中考英语真题试题(含解析)

新疆2017年中考英语真题试题（含解析）第Ⅰ卷（选择题，共100分）第一部分听力测试（共四大题，共30分）I. 听力（30分）（解析略）第二部分语言知识运用（共70分）II. 从B栏中选出与A栏中相匹配的答语（本题共5小题，每小题2分，共计10分）A B21. How often do you exercise? A. Urumqi, a beautiful city.22. What do you think of the football match last night? B. Twice a week.23. Did you take any photos in the park? C. So exciting.24. My brother broke his foot yesterday. D. Yes, we did.25. Where did you visit last weekend? E. I’m sorry to hear that. 【分析】21 你多久锻炼一次？一周两次．22 你认为昨晚的足球比赛怎么样？非常令人激动．23 你们在公园照相了吗？是的，我们照相了．24 我兄弟昨天摔了他的脚．听到这事我很难过．25 上周末你参观了哪儿？乌鲁木齐，一座美丽的城市．【解答】21 B 情景问答：根据问句你多久锻炼一次？是征对频率进行提问的，结合选项，故选B，一周两次．22 C 情景问答：根据问句你认为昨晚的足球比赛怎么样？结合选项，故选C，非常令人激动．23 D 情景问答：根据问句你们在公园照相了吗？结合选项，故选D，是的，我们照相了．24 E 情景问答：根据问句我兄弟昨天摔了他的脚．这是发生的一件不好的事情，通常表示难过，结合选项，故选E，听到这事我很难过．25 A 情景问答：根据问句上周末你参观了哪儿？结合选项，故选A，乌鲁木齐，一座美丽的城市．【点评】解答此类试题时，务必要充分利用上下文的语境和逻辑关系解题，找到解决问题的依据和线索．III. 单项选择（本题共10小题，每小题1分，共计10分）从A、B、C、D四个选项中，选择一个正确答案。

广西玉林市、贵港市2017届高中毕业班质量检测英语试题含答案

第一部分听力（共两节，满分30分）第一节（共5小题;每小题1。

5分，满分7.5分）听下面5段对话.每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置.听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1。

What does the woman mean？A.Invite Suzy again。

B.Go without Suzy.C.Suzy forgot about it。

2.What’s wrong with the speakers?A。

They have lost their way. B.They are in a traffic jam。

C.They broke a traffic rule。

3.Who is Gina？A。

The man's girlfriend。

B。

The man’s neighbor。

C.The man’s wife。

4。

How many people are going on the boat？A。

4. B.5. C.6。

5.Why hasn't the woman seen the man lately?A。

He has been preparing for the final exam。

B.He went out of town. C。

His mom made him study at home.第二节（共15小题;每小题1。

5分，满分22.5分)听下面5段对话或对白，每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置，听每段对话或独白前,你将有时间阅读各个小题。

每小题5秒钟；听完后，各小题给出5秒钟的作答时间.每段对话或独白读两遍.听第6段材料,回答第6、7题。

6.Why does Sally like her shirt?A.It was given by a friend。

广西崇左市中考英语真题试题无答案

广西崇左市中考英语真题试题第I 卷一、听力测试（共30分）（一）听句子，选画面。

你将听到5个句子，请根据所听到的内容，选出与句子内容相符的图画。

每个句子读两遍。

（每小题1分，共5分）A B C D E（二）听句子，选答语。

你将听到5个句子，请根据所听到的内容从每小题所给的A、B、C 三个选项中，选出最佳答语。

每个句子读两遍。

（每小题1分，共5分）6. A. Winter B. Math. C. Sunday.7. A. Yes, she does. B. Yes, she did. C. No, she can’t.8. A. He has a cold. B. In the park. C. An orange.9. A. Thank you. b. Yes, I think so C. No , don’t say so.10. A. what a pity! B. Never mind. C. Sounds good!（三）对话理解。

你将听到下面几段对话，请根据每段对话内容和所提出的问题，从每小题所给的A、B、C三个选项中，选出最佳答案。

每段对话读两遍。

（每小题1分，共10分）11. What does the boy need?A. A T-shirt.B. A hat.C. A sweater.12. How does the boy usually go to school?A. by bus.B. by bike.C. By subway.13. Where are the two speakers?A. In a hospital. b. In a bank. C. In a library.14. What does the woman think of Tina?A. She is hard-working.B. She is outgoing.C. She is not friendly.15. How long has the woman lived here?A. For 5 years.B. For 10 years.C. For 20 years.16. Why is the man late?A. He was ill.B. His car broke down.C. His clock didn’t work.听下面一段长对话，回答第17至18小题。

2017年广西北部湾经济区四市中考英语试卷及解析

2017年广西北部湾经济区四市中考英语试卷英语第1卷（共85分）一、听力测试（共30题，每小题1分，共30分）（一）、听句子，选画面（共5小题，每小题1分，共5分）1． 2． 3． 4． 5．(二)、听句子，选择最佳答案(共5小题，每小题1分，共5分)你将听到5个句子，请根据句子内容，选择恰当的答语，并在答题卡上按要求作答，每段对话读两遍。

6.A. Nice to meet you. B. See you tomorrow C.Fine, thank you.7.A. That’s great. B. You’re welcome C.You’re right.8.A.I’m 13. B. I’m watching TV. C. I have a cold.9.A. Yes, I do. B. Sorry，I won’t C.No, I don’t.10.A. Of course. B. I hope so. C.Good luck.（三）、听对话，选择最佳答案(共10小题，每小题l分，共10分)你将听到3段对话，请根据对话内容，选出每个问题的最佳答案，并在答题卡上按要求作答，每段对话读两遍。

请听第1段对话。

回答第11--13小题。

11.What will the weather be like this afternoon?A.RainyB. SunnyC. Windy12.Who will go fishing with Lily and David?A.Lily’s brother.B. Lily’s cousin.C. David’s cousin.13.What the time are they going to meet?A.At 7:00.B. At 7.15.C.At 7:30.请听第2段对话。

回答第14--20小题。

14.Where does Betty collect articles?A.From newspapers.B. From magazines.C. From storybooks.15.When did Betty start yo collect articles?A.At the age of 7.B. At the age of 9.C. At the age of 10.16.What will Mike probably show to Betty tomorrow?A.Some toy cars.B. Some articles.C. Some magazines.请听第3段对话。

广西玉林市、贵港市2017届高中毕业班质量检测英语试题

广西玉林市、贵港市2017届高中毕业班质量检测英语试题第一部分听力（共两节，满分30分）第一节（共5小题；每小题1.5分，满分7.5分）听下面5段对话。

每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话后，你都有10秒钟的时间回答有关小题和阅读下一小题。

每段对话仅读一遍。

1.What does the woman mean?A.Invite Suy again.B.Go without Suy.C.Suy forgot about it.2.What's wrong with the speaers?A.They have lost their way.B.They are in a traffic jam.C.They broe a traffic rule.3.Who is Gina?A.The man's girlfriend.B.The man's neighbor.C.The man's wife.4.How many people are going on the boat?A.4.B.5.C.6.5.Why hasn't the woman seen the man lately?A.He has been preparing for the final eam.B.He went out of town.C.His mom made him study at home. 第二节（共15小题；每小题1.5分，满分22.5分）听下面5段对话或对白，每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置，听每段对话或独白前，你将有时间阅读各个小题。

每小题5秒钟；听完后，各小题给出5秒钟的作答时间。

每段对话或独白读两遍。

听第6段材料，回答第6、7题。

6.Why does Sally lie her shirt?A.It was given by a friend.B.She is trying to be fashionable.C.She bought it in Paris.7.What does the man thin of Sally's clothes?A.They're not decent.B.They're in fashion.C.She should get more new dresses.听第7段材料，回答第8至9题。

精编版-2017年广西桂林市中考英语真题及答案

2017年广西桂林市中考英语真题及答案二、单项选择（每小题1分，共10分）从各题所给的A、B、C三个选项中，选出最佳选项．1. There are some ______ on the classroom walls.A.mapB.desksC.pictures【答案】C【考点】名词辨析【解析】此题暂无解析【解答】C 考查名词。

A地图；B课桌；C图画。

句意：在教室的墙上有一些图画。

在教室的墙上有一些图画。

some 修饰可数名词复数以及不可数名词，符合句意以及语法知识的，只有C，故选C。

2. Miss Li is ______ teacher.A.theyB.theirC.them【答案】B【考点】物主代词【解析】此题暂无解析【解答】B 考查物主代词。

they意思是“他们”，人称代词主格形式，作主语；their意思是“他们的”，形容词性物主代词，后面跟名词；them意思是“他们”，人称代词宾格形式，作宾语。

根据空格后面的词语是teacher，是名词，所以空格处用形容词性物主代词。

综上所述，故选B。

3. Meimei studies ________ than Lucy.A.hardB.hardlyC.harder【答案】C【考点】副词的比较级和最高级【解析】梅梅学习比露西更努力。

【解答】C 考查副词比较级。

根据题干、结合选项，可知句意：梅梅学习比露西更努力。

根据than以及句意可知，这里是两者比较，要用比较级，设空处修饰动词studies，故用副词比较级harder。

4. The coach is pleased ______ our football team.A.withB.toC.on【答案】A【考点】介词辨析【解析】此题暂无解析【解答】A 考查介词辨析。

句意：教练对我们的足球队很满意。

be pleased with sth.“对……感到满意”，be pl eased to do sth.“乐意做某事”，根据空后的宾语our football team可知该空用with，故选A。

2017年广西北部湾经济区四市英语中考试题及解析

2017年广西北部湾经济区四市同城初中毕业升学统一考试英语试题(考试时间120分钟，满分120分）第I卷（共90分）一、听力测试（共30小题，每小题1分，共30分）(2017•广西北部湾经济区) (―)听句子，选图片。

（共5小题，每小题1分，共5分）你将听到五个句子，请在下列六幅图中，选出与所听句子内容相符的图片，并在答题卡上将选定答案的字母标号涂黑。

每个句子读一遍。

(2017•广西北部湾经济区) (二）听句子，选答语。

（共5小题，每小题1分，共5分）你将听到五个句子，请根据句子内容，选择恰当的答语，并在答题卡上将选定答案的字母标号涂黑。

每个句子读两遍。

6. A. Nice to meet you. B. See you tomorrow. C. Fine, thank you.7. A. That’s great. B. You’re welcome. C. You’re right.8. A. I’m 13. B. I’m watching TV. C. I have a cold.9. A. Yes, I do. B. Sorry, I won’t. C. No, I don’t.10. A. Of course. B. I hope so. C. Good luck.(2017•广西北部湾经济区) (三）听对话，选择最佳答案。

（共10小题，每小题1分，共10分）你将听到三段对话，请根据对话内容，选出每个问题的最佳答案，并在答题卡上将选定答案的字母标号涂黑。

每段对话读两遍。

请听第一段对话，回答第11—13小题。

11. What will the weather be like this afternoon?A. Rainy.B. Sunny.C. Windy.12. Who will go fishing with Lily and David?A. Lily’s brother.B. Lily’s cousin.C. David’s cousin.13. What time are they going to meet?A. At 7:00.B. At 7:15.C. At 7:30.请听第二段对话，回答第14~16小题。

广西玉林市、贵港市2017届高中毕业班质量检测英语试题

广西玉林市、贵港市2017届高中毕业班质量检测英语试题第一部分听力（共两节，满分30分）第一节（共5小题；每小题1.5分，满分7.5分）听下面5段对话。

每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话后，你都有10秒钟的时间回答有关小题和阅读下一小题。

每段对话仅读一遍。

每小题5秒钟；听完后，各小题给出5秒钟的作答时间。

每段对话或独白读两遍。

听第6段材料，回答第6、7题。

2017年英语中考试卷及答案

2017年各类高中招生文化考试及答案英语（满分120分，考试时间100分钟）四、单项填空(共15小题，计15分)从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

16．It is said that ________ umbrella was invented over four thousand years ago by Chinese people．A．a B．an C．the D．不填17．As there were not enough chairs in the park．they had to sit on the ________.A．ground B．earth C．land D．field18．—This bus is always late，________?—It sure is．A．is not it B．isn’t it C．isn’t the bus D．doesn’t it19．—________ do you study for a test?—I study by working with a group．A．What B．Whom C．HOW D．Where20．Happiness ________ in her grandfather’s eyes every time he hears her voice．A．shines B．is shone C．has shone D．was shone21．Four hundred dollars for a pair of shoes，you ________ be joking!A．may B．can C．need D．must22．—The dish is delicious!—Well，at least it’s the one I cooked yesterday．A．as good as B．worse than C．as well as D．as bad as23．She will leave her homework ________ the teacher’s desk after school today．A．from B．to C．for D．on24．Excuse me，but may I ask you ________?A．what business are you in B．what business you’re inC．in what business are you D．are you in what business25．I prefer not to eat too much food ________ is fried，like French fries．A．that B．what C．it D．不填26．—Is there anything you want me to get on the bus?—Sure．________ take the suitcase?A．Do you mind B．How aboutC．Had you better to D．Why don’t you27．—bought ________ China Daily from a street-corner machine this morning．A．a page of B．a piece of C．a copy of D．a book of28．I’ve ________ all the photos in the drawer，but I still can’t find the one you need．A．opened up B．given away C．handed out D．looked through29．She ________ that same song so many times．I’m getting sick of it!A．sings B．sang C．will sing D．has sung30．—I’m afraid I’ve broken the chair．—________，I can easily get it fixed．A．No way B．Excuse me C．Never mind D．Go ahead五、完形填空(共15小题，计15分)通读下面短文，掌握其大意，然后在各题所给的四个选项(A、B、C和D)中选出一个最佳选项。

广西玉林、崇左2017中考试题数学卷(word版含答案)

2017年玉林市崇左市初中毕业暨升学考试数学一、选择题：本大题共12个小题,每小题3分,共36分.在每小题给出的四个选项中，只有一项是符合题目要求的.1.下列四个数中最大的数是( )A.0B.1-C.2-D.3-2.如图，直线,a b 被c 所截，则1∠和2∠是( )A.同位角B.内错角C.同旁内角D.邻补角3.一天时间为86400秒，用科学记数法表示这一数字是( )A.286410´B.386.410´C.48.6410´D.50.86410´4.一组数据：6，3，4，5，7的平均数和中位数分别是 ( )A.5，5B.5，6C.6，5D.6，6 5.下列运算正确的是( )A.()235a a =B.235a a a ?C.623a a a ?D.22321a a -=6.如图所示的几何体的俯视图是( )A B C D7.五星红旗上的每一个五角星 ( )A.是轴对称图形，但不是中心对称图形B.是中心对称图形，但不是轴对称图形C.既是轴对称图形，又是中心对称图形D.既不是轴对称图形，也不是中心对称图形8.对于函数()22y x m =--的图象，下列说法不正确的是( )A.开口向下B.对称轴是x m =C.最大值为0D.与y 轴不相交9.如图，在矩形ABCD 中，AB BC >，点,,,E F G H 分别是边,,,DA AB BC CD 的中点，连接,EG HF ，则图中矩形的个数共有( )A.5个B.8个C.9个D.11个 10.如图，一艘轮船在A 处测得灯塔P 位于其北偏东60°方向上，轮船沿正东方向航行30海里到达B 处后，此时测得灯塔P 位于其北偏东30°方向上，此时轮船与灯塔P 的距离是( )A.3海里B.30海里C.45海里D.303海里11.如图，大小不同的两个磁块，其截面都是等边三角形，小三角形边长是大三角形边长的一半，点O 是小三角形的内心，现将小三角形沿着大三角形的边缘顺时针滚动，当由①位置滚动到④位置时，线段OA 绕点O 顺时针转过的角度是( )A.240°B.360°C.480°D.540°12.如图，AB 是O ⊙的直径，,AC BC 分别与O ⊙相交于点,D E ，连接DE ，现给出两个命题：①若AC AB =，则DE CE =；②若45C =∠°，记CDE △的面积为1S ，四边形DABE 的面积为2S ，则12S S =，那么( )A.①是真命题，②是假命题B.①是假命题，②是真命题C.①是假命题，②是假命题D.①是真命题，②是真命题二、填空题（每题6分，满分18分，将答案填在答题纸上）13.计算：1-= ．14.若2214n a b +与3m a b 是同类项，则m n += ．15.分解因式：32a ab -= ．16.如图是小强根据全班同学喜爱四类电视节目的人数而绘制的两幅不完整的统计图，则喜爱“体育”节目的人数是人．17.如图，在边长为2的正八边形中，把其不相邻的四条边均向两边延长相交成一个四边形ABCD ，则四边形ABCD 的周长是 .18.已知抛物线：()20y ax bx c a =++>经过()1,1A -，()2,4B 两点，顶点坐标为(),m n ，有下列结论：①1b <；②2c <；③102m <<；④1n £. 则所有正确结论的序号是 .三、解答题（本大题共8小题，共66分.解答应写出文字说明、证明过程或演算步骤.）19.计算：()03201782tan 45p -°.20.化简：321122a a a a 骣-琪+-?琪--桫，然后给a 从1，2，3中选取一个合适的数代入求值. 21.已知关于x 的一元二次方程：()2120x t x t --+-=.(1)求证：对于任意实数t ，方程都有实数根；(2)当t 为何值时，方程的两个根互为相反数？请说明理由.22.在一个不透明的袋子中有一个黑球a 和两个白球,b c (除颜色外其他均相同).用树状图(或列表法)解答下列问题：(1)小丽第一次从袋子中摸出一个球不放回，第二次又从袋子中摸出一个球，则小丽两次都摸到白球的概率是多少？(2)小强第一次从袋子中摸出一个球，摸到黑球不放回，摸到白球放回；第二次又从袋子中摸出一个球，则小强两次都摸到白球的概率是多少？23.如图，AB 是O ⊙的直径，AC 是上半圆的弦，过点C 作O ⊙的切线DE 交AB 的延长线于点E ，过点A 作切线DE 的垂线，垂足为D ，且与O ⊙交于点F ，设DAC ∠，CEA ∠的度数分别是,a b .(1)用含a 的代数式表示b ，并直接写出a 的取值范围；(2)连接OF 与AC 交于点'O ，当点'O 是AC 的中点时，求a ，b 的值.24.某新建成学校举行美化绿化校园活动，九年级计划购买A ，B 两种花木共100棵绿化操场，其中A 花木每棵50元，B 花木每棵100元.(1)若购进A ，B 两种花木刚好用去8000元，则购买了,A B 两种花木各多少棵？(2)如果购买B 花木的数量不少于A 花木的数量，请设计一种购买方案使所需总费用最低，并求出该购买方案所需总费用？25.如图，在等腰直角三角形ABC 中，90ACB =∠°，4AC BC ==，D 是AB 的中点，E ，F 分别是AC ，BC 上的点(点E 不与端点,A C 重合)，且AE CF =，连接EF 并取EF 的中点O ，连接DO 并延长至点G ，使GO OD =，连接,,,DE DF GE GF .(1)求证：四边形EDFG 是正方形；(2)当点E 在什么位置是，四边形EDFG 的面积最小？并求四边形EDFG 面积的最小值.26.如图，一次函数()1150y k x k =+<的图象与坐标轴交于,A B 两点，与反比例函数()220k y k x=>的图象交于,M N 两点，过点M 作MC y ^轴于点C ，已知1CM =. (1)求21k k -的值；(2)若14AM AN =，求反比例函数的解析式； (3)在(2)的条件下，设点P 是x 轴(除原点O 外)上一点，将线段CP 绕点P 按顺时针或逆时针旋转90°得到线段PQ ，当点P 滑动时，点Q 能否在反比例函数的图象上？如果能，求出所有的点Q 的坐标；如果不能，请说明理由.。