20172018学年度第一学期期中质量检测(2)

2017---2018学年度上学期期中考试(满分：150分)第一部分：听力（30分）第一节听下面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 is the woman going to do?A. Have a coffee.B. Clean her office.C. Attend a meeting.2. What does the woman ask for?A. A dress of different size.B. A dress of better quality.C. A dress of a bright color.3. What does the man want to do?A. Borrow a ladder.B. Take his leave.C. Clean the roof.4. What will the woman probably do next?A. Go to the man’s place.B. Call the Hillsboro Hotel.C. Res erve an exhibition hall.5. Where are the speakers?A. At home.B. In a museum.C. In the city square.第二节听下面5段对话或独白。

每段对话或独白后有2至4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5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。

每段对话或独白读两遍。

听下面一段对话，回答第6和第7题。

6. Why has the man hardly seen the woman lately?A. She had a traffic accident.B. She moved to another place.C. She is working unusual hours.7. Where does the conversation take place?A. In an office.B. At a bus stop.C. In an apartment.听下面一段对话，回答第8至第10题。

2017-2018学年上学期期中质量检测试卷第一部分：听力（共两节，满分30分）第一节听下面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。

l，What will the boy do first?A．Play baseball． B．Watch TV． C．Do homework ．2．、Where does the man work now?A．In . B．In . C．In .3．What does the woman mean?A．Lucy got to school early．B．Lucy was late for schoolC．Lucy didn't come to school．4. What did the man think of the restaurant?A．Great． B．Not very good． C．Very bad．5．What month is it now?A．It’s May． B．It’s July． C．It’s September．第二节(共1 5小题；每小题1.5分，满分22.5分)听下面5段对话或独白。

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。

听每段对话或独自前，你将有时间阅题，每小题5秒钟；听完后，各小题将给出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．How was Mike’s life in ?A． Easy. B. Hard． C． Really fun．7．What do we know about the special dish?A．It’s a kind of soup．B．It’s mainly cooked with rice．C．It has no vegetables．听第7段材料，回答第8、9题。

2017-2018学年度第一学期期中质量检测六年级语文试卷一、看拼音写词语。

(10分)sh ēn q ū　q íｎmi ǎnm éng l óngp íng y ōng zh ān y ǎngj ìng m ì　q īli áng ku íw úju àn li àn b ào yu àn二、给加点的字选择正确的读音打“√”。

(4分)唱和(h è　h é) 树冠(gu ān gu àn) 藐视(mi ǎo mi è) 滋养(z ī　c ī)纤夫(qi ān qi àn) 露马脚(l ùl òu ) 泛滥(ji ān l àn) 旋转(zhu àn zhu ǎn) 三、给下列词语选择正确的字打上“√”。

(4分)(俊骏竣)工恩(次赐辞) 兴高采(列咧烈) 可见一(斑班癍) 枯(歇竭渴) (韵蕴运)律(震振镇)耳欲聋和(蔼爱哀)可亲四、用“”画去不恰当的成语。

(4分)1.爷爷的棋艺(变幻莫测炉火纯青)，造诣极深，还出过书呢！2. 南湖公园太美啦，让人(刻骨铭心流连忘返)。

3.他的作品真是(别具一格随心所欲)，难怪有这么多读者。

4. 小明平时没有好好学习，现在是心急如焚，(寝不安席高枕安寝)。

五、读下面一段话，在括号里填入由“静”字组成的词。

(2分)夜深了，周围一片()。

病房里，玲玲坐在妈妈身边，看着妈妈()的脸，想起妈妈给她无限的爱，心情久久不能()，眼泪不由自主地流了下来。

张医生抚摸着她的头，轻轻地说：遇事要()，不要激动与慌张，妈妈会好的。

六、给带点的词选择正确的解释，把序号写在括号里。

(2分)1.手疾眼快( ) ①疾病②痛苦③痛恨④急速2.浑然一体( ) ①浑浊②糊涂，不明事理③天然的④全，满3.随心所欲( ) ①欲望②想要，希望③需要④(副词)将要4.负荆请罪() ①背②担负③背弃，辜负④亏欠、拖欠七、按要求填空。

2017—2018学年度第一学期期中测试题总分：150分时间：120分钟第I卷(听力题共30分)（共5小题；每小题1.5分，满分7.5）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，并在答题卡上将该选项涂黑。

听完每段对话后，你都会有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。

How soon will the speakers arrive at the airport?In 30 minutes B.In 50 minutes C.In 90 minutes What will the speakers discuss?A report B.A computer C.A report on computerWhat are the speakers talking about?A child B.A room C.A presentWhat can we learn from this conversation?The woman does not get along well with the man.The woman does not get along well with her roommate. The man will talk with the woman’s roommate.Where are the two speakers now?On the first floor B.On the fourth floor C.On the fifth floor （共15小题；每小题1.5分，满分22.5）听下面5段对话或独白。

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，并在答题卡上将该选项涂黑。

听完每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。

2017—2018学年度第一学期期中考试试题(满分：120分时间：100分钟)第一部分阅读理解(共两节，满分40分)第一节(共15小题；每小题2分，满分30分)阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。

ADoctor Seuss was born in 1904. By the middle 1950s, he had become one of the best-loved and most successful children's book writers in the world . His books are very popular with young readers. They enjoy t he invented words and the pictures of unusual funny animals and plants.In 1954, life magazine published a report about school childre n who could not read. The report said many children's books were not interesting. Doctor Seuss strongly hoped to help chil dren and decided to write books that were interesting and eas y to read. He used words with the same ending sound, like fis h and wish. He did not receive training in art. Yet, he drew thepictures for most of his books.In 1957, Dr. Seuss wrote The Cat in the Hat. He used less tha n 230 words to write the book and even a six-year-old should be able to read it. It was a fun story and easy to re ad. Children loved it. Their parents loved it, too. Today it is stil l one of the stories they like best. The success of The Cat in t he Hat made him want to write more books for children. In 19 60, he wrote a book using less than fifty words. The book is c alled Green Eggs and Ham.In 1984, Doctor Seuss won a Pulitzer Prize (普利策奖). He was honored for the education and enjoyment his boo ks provided American children and their parents.He died at the age of 87, but his influence remains. Millions of his books have been sold worldwide. People say his books h elped change the way American children learned to read. Yet, his books are loved by people of all ages. Doctor Seuss once said, "I do not write for children. I write for people.1. People like Seuss’ books because the books ______.A. are cheap and easy to getB. were written in different languagesC. are easy and interesting to readD. were written with invented words2. He wrote the book The Cat in the Hat at the age of _____.A. 50B. 53C. 56D. 873. Which of the following is TRUE according to the passage?A. Doctor Seuss wrote Green Eggs and Ham with over 230 w ords.B. Doctor Seuss wrote books only for children in the United St ates.C. The Cat in the Hat was written only for six-year-old children.D. His books provided education and enjoyment for American s.4. From the text we know that Doctor Seuss __________.A. won a Pulitzer Prize soon after his deathB. sold millions of his books himself worldwideC. changed American children's way of readingD. wrote the largest number of books in the worldBHappiness is important for everyone. Most people want to be happy but few know how to find happiness. Money and succe ss don’t bring lasting happiness. Happiness depends on ours elves. In other words, we make our own happiness.Some people believe that if they are wealthy, they will be able to do anything they want, which means happiness. On the ot her hand, some people believe that holding a high position in t he government is happiness. In this way, you have not only m oney, but also many other things which can’t be bought by mo ney. However, other people believe that having lots of money is not happiness, nor is holding a high position in the governm ent. These people value their beliefs, or their intelligence, or t heir health. They think these can make them happy.Here are a few ways to help you be happier.The first secret of happiness is to enjoy the simple things in lif e. Too often, we spend so much time thinking about the future , for example, getting into college or getting a good job, that w e don’t enjoy the present. You should enjoy life’s simple pleas ures, such as reading a good book, listening to your favorite music, or spending time with close friends. People who have close friends usually enjoy happier and healthier lives.The second secret of happiness is to be active. Many people go dancing or play sports. People can forget about their probl ems and only think about the activities.Finally, many people find happiness in helping others. Accordi ng to studies, people feel good when they volunteer their time to do many meaningful things for other people. If you want tofeel happier, do something nice for someone. You can help a friend with his or her studies, go shopping to get food for an ol d neighbor, or simply help around the house.Now maybe you know how to find happiness!5. The underlined word “wealthy” means “__________” in the a rticle.A. pleasedB. healthyC. excitedD. rich6. The writer thinks the secret of happiness is that people ___ ________.A. think about getting a good jobB. think of presents th ey don’t likeC. often spend time with close friendsD. often spend time on entering the college7. The passage mainly tells us _________.A. how to find happinessB. how to save happines sC. to do something good for othersD. to value our belie fs or healthCWelcome to your future life!You get up in the morning and look into the mirror. Your face i s firm and young-looking. In 2035, medical technology is better than ever. Many people at your age could live to be 150, so at 40, you’re not o ld at all. And your parents just had an anti-aging treatment. Now, all three of you look the same age! You say to your shirt, “T urn red.” It changes from blue to red. I n 2035, “smart clothes” contain particles much smaller than th e cells in your body. The particles can be programmed to cha nge your clothes’ color or pattern.You walk into the kitchen. You pick up the milk, but a voice sa ys, “You shouldn’t drink that!” Your fridge has read the chip th at contains information about the milk, and it knows the milk is old. In 2035, every article of food in the grocery store has suc h a chip.It’s time to go to work. In 2025, cars drive themselves. Just tel l your “smart car” where to go. On the way, you can call a frie nd using your jacket sleeve. Such “smart technology” is all aro und you.So will all these things come true? “For new technology to suc ceed,” says scientist Andrew Zolli, “it has to be so much better that it replaces what we have already.” The Internet is one ex ample—what will be the next?8. We can learn from the text that in the future ________.A. people will never get oldB. everyone will look the sameC. red will be the most popular colorD. clothes will be able to change their pattern9. What can be inferred from Paragraph 4?A. Milk will be harmful to health.B. More drinks will be available for sale.C. Food in the grocery store will carry electronic information.D. Milk in the grocery store will stay fresh much longer.10. Which of the following is mentioned in the text?A. Nothing can replace the Internet.B. Fridges will know what people need.C. Jacket sleeves can be used as a guide.D. Cars will be able to drive automatically.11. What is the text mainly about?A. Food and clothing in 2035.B. Future technology in everyday life.C. Medical treatments of the future.D. The reason for the success of new technology.DFirst aid is emergency care for a victim of sudden illness orinjury until more skillful medical treatment is available. It may save a life or improve certain important signs including pulse, temperature, a clear airway, and breathing. In minor emergen cies, first aid may prevent a victim's condition from turning wor se and provide relief from pain. First aid must be done as quic kly as possible. In the case of the seriously injured, a few min utes can make the difference between complete recovery and loss of life.First-aid measures depend upon a victim's needs and the provider' s level of knowledge and skill. Knowing what not to do in an e mergency is as important as knowing what to do. Improperly moving a person with a neck injury, for example, can lead to p ermanent spinal(脊柱的) injury and paralysis (瘫痪) .Despite the variety of injuries possible, several rules of first aid apply to all emergencies. The first step is to call for expert medical help. The victim, if conscious, should be reassured t hat medical aid has been requested, and asked for permissio n to provide any first aid. Next, assess the scene, asking oth er people or the injured person's family or friends about detail s of the injury or illness, any care that may have already been given, and pre-existing conditions such as diabetes(糖尿病) or heart trouble. The victim should be checked for a medical card that describes special conditions. Unless the accident scene becomes unsafe or the victim may suffer further injury, do not move the victim.First aid requires rapid assessment of victims to decide wh ether life-threatening conditions exist. One method for accessing a victi m's condition is known by the acronym(首字母缩写词) ABC, which stands for:A-Airway: Is it open and clear?B-Breathing: Is the person breathing? Look, listen, and feel for b reathing.C-Circulation: Is there a pulse? Is the person bleeding externally ? Check skin color and temperature for additional indications of circulation problems.12. First aid may bring about all the following results EXCEPT .A. saving a victim's lifeB. preventing a victim's condition from getting worseC. relieving a victim from painD. helping a person avoid sudden illness or injury13. Before we offer first aid to a victim, it is very important for us .A. to make sure what to do and what not to doB. to refer to all kinds of handbooks on first aidC. to remove the ring or bracelet he/she may be wearingD. to take him/her to a hospital at once14. In giving first aid to a victim, you should first of all .A. remove his/her from the accident sceneB. turn him/her overC. call for professional medical helpD. examine him/her carefully15. The purpose of the passage is to tell the reader . .A. the importance of protecting the accident sceneB. some basic facts about first aidC. what professional medical help isD. who can offer first aid第二节 (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。

2017—2018学年度第一学期期中检测九年级语文试卷第一部分（1～6题22分）1.在下面的横线上填写出相应的句子。

（7 分）（1）在《观刈麦》中，侧面表现农民劳动繁忙的诗句是：，童稚携壶浆。

（2）苏轼的《江城子·密州出猎》中抒写人到中年的主人公，壮志未酬的感叹的句子：，鬓微霜，又何妨！（3）了却君王天下事，。

（辛弃疾《破阵子·为陈同甫赋壮词以寄之》）（4）《出师表》中表明作者志趣的句子：苟全性命于乱世，。

（5）在《陈涉世家》中，表明陈胜从小就有远大理想的句子：。

（6），燕然未勒归无计。

（范仲淹《渔家傲•秋思》）（7）江山如此多娇，。

（毛泽东《沁园春•雪》）2.选出加点字读音不相同的一项。

（3分）（）A．赶尽杀绝感恩戴德敢作敢为B．攻城略地供不应求功成名就C．数以万计数见不鲜如数家珍D．兼收并蓄坚壁清野艰苦卓绝3．下列句子中没有语病的一句是：（3分）（）A．不但老师表扬了我，而且也表扬了其他同学。

B．坚持从实际出发，是能否搞好工作的必要条件。

C．无论干部和群众，毫无例外，都应该切实遵守社会主义法制。

D．我冒了严寒，回到相隔二千余里，别了二十余年的故乡去。

4.选出没有对偶修辞的一项。

（3分）( ) A．山舞银蛇，原驰蜡象，欲与天公试比高。

B．巧笑东邻女伴，采桑径里逢迎。

C．墙上芦苇，头重脚轻根底浅；山间竹笋，嘴尖皮厚腹中空。

D．苔痕上阶绿，草色入帘青。

谈笑有鸿儒，往来无白丁。

5．填到下列文字横线处能合理衔接的一句是：（3分）（）十月三日和四日，我们先后参观了当地的养鸡场和机械厂，。

A．尽管那天下着雨，我们还是坚持参观完了才回家。

B．碰巧，一整天雨下个不停，所以我们只看了个大概。

C．不巧，碰上连绵阴雨，使参观受到一定影响。

D．不巧，这天下了场大雨，又刮风，实在是扫兴。

6.下列广告词对成语进行了改动，请任选三个写出其原型。

（3分）（1）消炎药广告词：快治人口（2）热水器广告词：随心所浴（3）止咳药广告词：咳不容缓（4）摩托车广告词：骑乐无穷（5）营养液广告词：口蜜腹健（6）眼病仪广告词：一明惊人答：第二部分（7～24题48分）一、阅读下面一首宋词，回答7～9题。

2017——2018学年度上学期期中考试本试卷分第Ⅰ卷（90分）和第Ⅱ卷（60分）总分150分。

答题时间120分钟第一卷第一部分听力 (共两节，20小题，每小题1分，满分20分)第一节听下面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 is the woman going to do tomorrow?A. Go fishingB. Go swimmingC. Go to the ho spital2.How does the man find his job?A. It is interesting and fun.B. Its pay is good.C. It is a lways tiring.3.What are the speakers talking about?A.A story.B. A book.C.A movie.4.Where does the conversation probably take place?A. At the railway station.B. At the bus stop.C. At the airport.5.Where is the man going ?A. The classroom.B. The cinema.C. The library .第二节听下面5段对话或独白。

选出最佳选项。

请听第6段材料. 回答第6至7题。

6.Why is the man going to the United States?A. To travel.B. To visit his friends.C. To attend a conference.7.When will the man probably leave for the United States?A. In mid-February.B. In mid-January. C. In early January请听第7段材料，回答第8至9题。

2017-2018学年度第一学期期中质量检测八年级数学试卷10小题，每小题3分，共30分）．在平面直角坐标系中，点（﹣1，－2）在（）A．第一象限 B．第二象限C．第三象限D．第四象限．在如图所示的象棋盘上，若“帅”和“相”所在的坐标分别是（1，﹣2）和（3，﹣2））A. （﹣2，1） B．（﹣2，2）C．（﹣1，1） D．（﹣1，2）．直线y=x﹣2与y=﹣x﹣4的交点坐标为（）A．（﹣2，3）B．（2，﹣3） C．（－1，－3）D．（1，3）．在平面直角坐标系中，直线y=－kx+b（k＜0，b＞0）不经过哪一象限（）A．第一象限 B．第二象限C．第三象限D．第四象限．一次函数y=ax﹣a（a≠0）的大致图象是（）A． B．C． D．．现有3 cm，4 cm，7 cm，9 cm长的四根木棒，任取其中三根组成一个三角形，那么可( )A．1个 B．2个 C．3个 D．4个如图，A，B，C，D，E，F是平面上的6个点，则∠A+∠B+∠C+∠D+∠E 的度数是（）A. 180°B.270°C.360°D.540°8．直线l1：y=ax+b与直线l2：y=mx+n在同一平面直角坐标系中的图象如图所示，则关于x的不等式ax+b＜mx+n的解集为（）A．x＞﹣2 B．x＜﹣2 C．x＞1 D．x＜19．下列判断：①有两个内角分别为55°和25°的三角形一定是钝角三角形；②直角三角形中两锐角之和为90°；③三角形的三个内角中至少有两个锐角；④三条高不相交的三角形一定是钝角三角形，其中正确的有( )个A．1 B．2 C．3 D．410．某人骑自行车沿直线旅行，先前进了a km, 又原路返回b km(b<a),休息了一段时间，再推车步行c km,此人离起点的距离y与时间x之间关系示意图象应为（）二．填空题（本大题共5小题，每小题4分，共20分）11．若点（n，n+3）在一次函数2)1(12+-=+mxmy的图象上，则n= ．12．若函数y=kx-3的图象与两坐标轴围成的三角形面积为6，那么k= ．13．已知直线y=kx+b经过点（﹣2，3），并且与直线y=－2x+1平行，那么b= ．14．如图，把一副常用的三角板如图所示拼在一起，那么图中∠ABF= ．15．在一次自行车越野赛中，出发mh后，小明骑行了25km，小刚骑行了18km，此后两人分别以a km/h，b km/h匀速骑行，他们骑行的时间t（单位：h）与骑行的路程s（单位：km）之间的函数关系如图所示，观察图象，可得小刚追上小明时离起点 km；答题卷一、选择题（每题3分，共30分）二、填空题（每题4分，共20分）11． ． 12． ．13． ．14． 15． 三、解答题：（共40分，每题10分）16．如图,ABC ∆的三个顶点坐标分别为A(-1,1),B(-2,3),C(-6,2),平面直角坐标系中画出ABC ∆，并求ABC ∆的面积.17．已知y ﹣3与3x+1成正比例，且x=2时，y=6.5． （1）求y 与x 之间的函数关系式，并指出它是什么函数； （2）若点（a ，2）在这个函数的图象上，求a ．18、已知，直线l 在平面直角坐标系中与y 轴交于点A ，点B （﹣3，3）也在直线l 上，将点B 先向右平移1个单位长度，再向下平移2个单位长度得到点C ，点C 也在直线l 上． 求点A 的坐标和直线l 的解析式；19．如图，∠MAN=100°，点B 、C 是射线AM 、AN 上的动点，∠ACB 的平分线和∠MBC 的平分线所在直线相交于点D ，求∠BDC 的大小四.综合与实践：（10分）20.已知某种鞋子的型号“鞋码”和鞋子的长度“cm ”之间存在一种换算关系如下：（1）通过画图、观察，猜想上表“鞋码”与鞋长之间的关系符合你学过的哪种函数？简单说明你猜想的过程。

2017—2018学年上期期中质量检测试卷（六年级语文）一、我会听：请认真听老师读短文，按要求完成练习。

（7分）1、 写出课外积累的三个有关天气的成语。

(3分)风雪交加（ ）（ ）（ ） 2、“那句克雷斯永远不会忘记的话”是什么？(1分)3、文章结尾写道:“用爱心把它们串起来”中的它们指的是什么？(1分)6、看了这篇文章，说说你怎样理解“承诺”一词？(2分)二、积累与运用（39分）1、请你在下面的方格中抄写这句诗，注意要写得正确、规范、美观。

（2分）2、看拼音，写汉字，要写得正确、美观。

（5分）ji ān jù qín miǎn â liâ kuí wú dǎo mãi交涉(sâ shâ) 阻挠(l áo náo) 逃窜(quàn cuàn) 狂风怒号(háo hào) 瘦削．（xu ē xi āo ） 运载．（z ài z ǎi ） 刚劲．（jìng jìn） 要．挟（y āo y ào ） 4、读句子，选出加点字的正确解释，把序号填在括号里。

（4分） 生：①生疏；②具有生命力；③生长；④发生。

(1)一只生着坚硬黑甲的小虫，迷失在这座森林里。

( ) (2)一个陌生的老妇人坐在对面静静地望着我。

( ) (3)用脏手拿东西吃，容易生病。

( ) (4)春天花园里一片生机盎然的景象。

( ) 5、补充词语，并根据要求答题。

（６分）( ) ( )大物 德高( )( ) 狂风( )( ) ( )( )讥笑 ( )( )安席 水( )石( ) 6、按要求完成句子练习。

（5分）（1）1. 我们怎能忘记老师的谆谆教导？（改为陈述句）（2）我们不能因为学习任务重而不参加体育活动。

（改为反问句） （3）山民的几句朴素的话蕴含着意味深长的哲理。

ABCDA B D C M N2017-2018学年度上期期中教学质量检测 八年级数学试题（本试卷120分 考试时间100分钟）一、选择题（每小题3分，满分24分）下列各小题均有四个答案，其中只有一个是正确的1．下列平面图形中，不是轴对称图形的是 （ ）2.以下列各组线段为边，能组成三角形的是（ ）A. 2 cm ，3 cm ，5 cmB. 3 cm ，3 cm ，6 cmC. 5 cm ，8 cm ，2 cmD. 4 cm ，5 cm ，6 cm 3.已知等腰三角形的两边长分别为3和6，则它的周长等于（ ） A. 12 B. 12或15 C. 15 D. 15或184．如图，已知MB=ND,∠MBA=∠NDC ，下列条件中不能判定△ABM ≌△CDN 的是（ ）A.∠M=∠NB.AM=CNC.AB=CDD.AM ∥CN 5.一个多边形的内角和等于1080°，这个多边形的边数是（ ） A ．9 B ．8 C ．7 D ．6 6.下列说法中，错误的是 （ ）A.一个三角形的三个内角中，至少有一个角不大于600B.有一个外角是锐角的三角形是钝角三角形C.锐角三角形中，两个角的和小于直角D.直角三角形中有一个外角等于和它相邻的内角7. AD 是△ABC 的角平分线，过点D 作DE ⊥AB 于E ，DF ⊥AC 于F•,则下列结论不一定正确的是（ ）A ．DE=DFB ．BD=CDC ．AE=AFD ．∠ADE=∠ADF8.如图，把长方形纸片ABCD 纸沿对角线折叠，设重叠部分为△EBD ，那么， 有下列说法： ①△EBD 是等腰三角形，EB=ED ②折叠后∠ABE 和∠CBD 一定座号：________A B CD相等 ③折叠后得到的图形是轴对称图形 ④△EBA 和△EDC 一定是全等三角形 其中正确的有（ ）A.1个B.2个C.3个D.4个二、填空题（共7小题，每小题3分，满分21分）9.在△ABC 中，∠A ∶∠B ∶∠C ＝2∶3∶4，则∠A ＝________，∠C ＝________ 10.正十边形的每一个内角的度数等于______，每一个外角的度数等于_______． 11. 在△ABC 中，∠C=90°，BC=16cm ，∠BAC 的平分线交BC 于D ，且BD ︰DC=5︰3，则D 到AB 的距离为_____________.12. 如图,∠A=36°,∠DBC=36°,∠C=72°,则图中等腰三角形有_____ 个。