太原市2017年高三模拟试题(二)
太原市2017年高三模拟试题(二)
第二部分阅读理解（共两节，60分）
第一节（共15小题，每小题3分，满分45分）
A.During the night.
B. Only on the three Sundays.
C. In the season of spring.
D. From 10:00 am to 3:15 pm every day.
22. What can we know from the passage?
A.Spring Discovery will be held every the other year.
B.The instructors are all experienced adult experts.
C.Kestrel might be experienced in holding the camp.
D.The entire family is welcome to the Kestrel Sundays.
23. What will the children do in the camp according to the passage?
A.Visit the group leaders.
B. Learn how to cooperate.
C. Plant trees in the forest.
D. Help elders to tell stories.
B
Some scientists will say it is impossible to read minds. They will also tell you that you can make educated guesses on what a person might be thinking or feeling. Perhaps there really is
nothing mysterious about the power to read minds. Perhaps it is simply human sense based on observation and educated guesses after all, but that’s really a useful ability to learn.
Learn body language. How a person moves and holds their hands, and even what their eyes are doing are actually telling about what is going on inside their head. For example, pupils（瞳孔） tend to grow larger when you are interested in or excited about something. If you are talking to someone and making eye contact, finding their pupils are large and round, chances are that they are not feigning interest in the conversation. Someone biting their nails is probably nervous. Someone who folds their arms across their chest when they are not cold is probably trying to put a barrier between you and themselves.
Learn to mentally put yourself in another’s place. Scientists have recently discovered that your brain has neurons（神经元）that become active when you watch someone do something the same as we did the action ourselves. So when you are able to open yourself to understanding how other people are feeling, you can figure out reasons and predict future actions, reactions, even thoughts.
Sometimes you can use Extra Sensory Perception（ESP）（超感觉力）to read someone’s mind. This does not mean you will literally be able to read their mind like a book. Instead, you will receive impressions or feelings, which are difficult to explain.
To improve your ESP abilities, take up meditation（冥想）. Because meditation helps enable you to purposely put your brain in a state of relaxed awareness, where you will be more successful in reading people and receiving impressions.
Practice and combine all of these steps. You will soon find yourself able to read people’s mind.
24.What is the passage mainly about?
A.The ways of reading people’s minds.
B.The steps of learning body language.
C.The necessity of learning body language.
D.The relationship between mind and body language.
25.What does the underlined word “feigning”mean?
A.Expressing.
B. Pretending.
C. Finding.
D. Declaring
26.Why can you read someone’s mind when you mentally put yourself in his/her place?
A.You suddenly have the ability to understand his or her feeling.
B.Your imagination ability and your past experience are combined.
C.Some neurons in your brain improve your observation ability.
D.Your past similar experiences make some neuron in your brain active.
27.How does meditation help with mind reading?
A.By making educated guesses on minds.
B.By learning to make eye contact.
C.By changing ESP abilities for the better.
D.By strengthening impressions received.
C
“Stop all the rushing and screaming: too much excitement is bad for families. Kids are missing out on an essential life - relaxed down time,”says Dr. Charleotte Reznick.
“Parents work, and kids do scheduled activities -- there’s little family time without pressure,”says Reznick.“One parent is taking the son to a soccer game, and the other parent is taking the daughter to her swim meet. Then there’s art class, baseball practice, extra tutoring,
and more! By the time the family meet up for dinner, everyone is exhausted.”
All the rushing makes for a short temper. “When parents are reduced to shouting at their children to get to them to listen, they lower their own self-esteem as well as losing the respect of their children,” says Dr. Carl Pickhardt. “While parents think it shows they’re serious about what they’re saying, they are really just showing helpless desperation at not getting their way.”
These days what kids are learning at school and from the outside is a lot greater than it used to be even just a generation ago.
“The problem is that stress-relieving activities -- reading, taking walks or hot baths, watching the sunset and other activities are not even part of most kids’ experience any more,”says Reznick.
“There are so many more social-interaction opportunities in our computer age, but not all of them promote meaningful connections, which is another potential outlet for stress,”she says.
One way to relieve stress is a simple technique called “the balloon breath”. It’s a great way for everyone to become calm so that they can respond thoughtfully rather than just react.
Here’s how to do it. Imagine a deflated（未充气的）balloon in your stomach -- about two to three inches below your navel（肚脐）. Slowly breathe in to a count of 1...2...3... and feel the lower belly expand, and flatten as you slowly breathe out to a count of 1...2...3...
28.What can we infer from the second paragraph?
A.Kids can hardly enjoy family time due to heavy burdens.
B.Saturday is the only leisurely day of the week for kids.
C.The life of kids is becoming rich due to extra classes.
D.Parents have no time on weekends to care for their kids.
29.What does Dr. Carl Pickhardt think of parents when they yell?
A.They have no self-confidence.
B.They take what they say seriously.
C.They are always behaving like children.
D.They are less respected and seem desperate.
30.What is the function of “the balloon breath”according to the seventh paragraph?
A.To make one cool down.
B. To test one’s patience.
C. To raise one’s awareness.
D. To fill a balloon with air.
31.What is the purpose of the author writing this passage?
A.To tell educators to be patient.
B.To advise parents not to make life too stressful for kids.
C.To encourage kids to pursue creativity.
D.To show that kid need patience and love from their parents.
D
Opera is an art form that celebrates the human voice. No other art form creates excitement and moves the heart in the way that opera does, especially when performed by a great singer. Opera is an important part of the Western classical music tradition. It uses music, words and actions to bring a dramatic story to life. Opera started in Italy at the end of the 16th century and later became popular throughout Europe. Over the years, it has responded to various musicals. In recent decades, much wider audiences have been introduced to opera through modern recording technology. Some singers have become celebrities thanks to performing on radio, on TV, and in the cinema.
However, in recent years, opera has been facing serious challenges. One current challenge to opera is economic. The shortage of money raises the broader question of how much should be paid to support opera singers and other artists. Society seems to accept the large salaries paid to business managers and the multi-million-dollar contracts given to sports athletes. But what about opera singers? Somehow, people have the idea that artists can be creative only if they suffer in poverty, but this is unrealistic. If artists, including opera singers, lack the support they need, valuable talent is wasted.
Not only the shortage of money, but also the way money is managed in the opera world has led to hardships. Principal singers are generally paid performance fees once they complete a show. They typically receive nothing during the many weeks of rehearsal（排练）before a show starts.
Another problem faced by opera is how to meet the demands of audiences who are influenced by popular entertainment. Pop singers are often judged as much on the basis of how they look as how they sound. These demands may be unrealistic ans possibly harmful. Opera singers simply cannot make a sound big enough to fill a large theater or concert hall without a microphone if their body weight is too low. Emphasizing physical appearance over singing ability may cause audiences to miss out on the human voice at its best.
There are no easy solution to opera’s problem and there are many different opinions about the value of opera. However, every year many young people register for music courses with hopes and dreams of developing their talent in this special art form. The fact that opera has survived many obstacles and continues to attract the rising generation shows that it remains a respected art form full of value.
32.Which of the statements is TRUE according to the passage?
A.Opera singers’ life stories are dramatic.
B.Opera will soon appear on TV and in films.
C.Opera fans thank celebrities for performing.
D.Opera develops by adapting to new conditions.
33.What can we know from Paragraph 2 and 3?
A.Opera singers are financially insecure.
B.Opera singers waste their valuable talent.
C.Opera singers get paid before the show.
D.Opera singers perform better if they are poor.
34.What does the author try to say in Paragraph 4?
A.Popular culture has had a positive influence on opera.
B.Audiences know best how opera should be performed.
C.Microphones should be used to make opera more enjoyable.
D.Opera singers’ voices should be valued more than their looks.
35.What would be the best title for this passage?
A.The Economic Challenge to Opera
B.Opera Faced with the Difficulties
C.Opera as Part of Popular Culture
D.The Historical Context of Opera
第二节（共5小题，每小题3分，满分15分）
Developing good study habits isn’t easy. ___36___. In this way, you’ll become more and more successful as a student.
Start by allowing mo interruptions. ___37___. You have to give 100 percent of your attention to your work. Don’t allow yourself to be distracted by friends or fellow students. Keep your goal in mind; know what you have to do and when it needs to be done. Don’t let other people influence you into no doing your work.
___38___. If you study best in the morning, plan to do your hardest subjects first. Remember not to leave today’s work till tomorrow. A delay like this is called “procrastination”. If you delay for any reason, you will find it more and more difficult to get things done when you need to. You may rush to make up the time you wasted getting started, resulting in careless and error-filled work.
Another good way to study is to take part in partnered and group-study sessions. These allow students to share ideas, and help each other deal with difficult material. ___39___.
Forming good study habits can be difficult at first, and requires energy and a strong will. But if you commit yourself to it, success will be yours. ___40___. By doing so, you will know that you have tried. If you are satisfied with what you’ve done and know that you have tried your best, your grade will be the icing on the cake.
A.Figure out when you’re most productive
B.It’s impossible to study while chatting or watching TV
C.Always give your best in the classroom and in study sessions
D.Putting off your task for any reason can make it difficult to finish on time
E.You may do well enough but maybe you can hardly achieve your goal easily.
F.But start with a plan, put in a lot of hard work, and studying will become easier.
G.In addition, learning among students is a good way of getting a firmer grasp of the material. 第三部分语言知识运用
第一节完形填空（共20小题，每小题2分，满分40分）
Life in the Slow Lane
I always seemed to be rushing through my life. I’d __41__ my seat-belt and slam（猛踩）the accelerator to get to where I wanted to go. Or, at the mall, I’d __42__ the stores like a runner in the hundred-meter dash. There just weren’t enough hours in the day and I was afraid I might _43_ something if I didn’t hurry up.
And then one day, as fate would have it, I ran out of __44__. As my car coasted off the road, I looked at my watch and hit the steering wheel __45__. I had a meeting in fifteen minutes and I hadn’t even finished __46__ for it.
But as I got out of my car, a(n) __47__ thing happened. I looked out towards the east, and the __48__ was just beginning to shine over the horizon. There was a low misty __49__ hanging over the river, and some ducks were cutting thick, smooth trails（痕迹）across the otherwise glass-like surfaces of the water. A few sailboats __50__ at anchor, their mirror images extending out before them.
I was shocked. This __51__ scene had been going on right outside my car every morning and I had never __52__ time appreciating it. I had been rushing around in such a __53__ that I had been missing everything!
I was quietly, __54__, patiently watching as the sun painted a brand new day when a co-worker finally __55__ my car and stopped for me. I had somehow been transformed. Life went from a fast break dance into a slow waltz. I began taking long, slow walks __56__ my yard and neighborhood, noticing for the first time all the neighbors, mysteries and wonders __57__ were
right there for me to see all the time. Not only were there sights that I had been missing, but I began to hear entire __58__ all around me: birds singing, wind blowing and leaves rustling.
__59__ one gives close attention to anything, even a blade of grass, it becomes a mysterious, beautiful and indescribably magnificent __60__ in itself.
41.A. harden B.loosen C.tighten D.widen
42.A. race through B. pass by C. come across D.look into
43.A. waste B. miss C. meet D. cost
44.A. money B. water C. time D. gas
45.A. delightfully B. in depression C. bravely D. in astonishment
46.A. waiting B. calling C. caring D. preparing
47.A. confusing B. amusing C. amazing D. embarrassing
48.A. star B. light C. moon D. sun
49.A. ice B. wind C. smoke D. fog
50.A. sat B. went C. seated D. reached
51.A. disastrous B. accidental C. glorious D. necessary
52.A. brought B. spent C. taught D. founded
53.A. hurry B.case C. position D. mess
54.A. regretfully B. joyfully C. obviously D. carelessly
55.A. memorized B. borrowed C. recognized D. opened
56.A. around B. with C. for D. from
57.A. which B. that C. who D. what
58.A. symphonies B. fantasies C. noises D. cultures
59.A. Until B. Although C. The moment D. The present
60.A. space C.village C. city D. world
第二节（共10小题，每小题1.5分，满分15分）
I had hardly sat down on the train and opened a bar of chocolate __61__ a really old man with huge bags sat down across from me. I said hello __62__ him, smiling sweetly and then I suddenly thought,“Why not offer him a piece of chocolate?”So I did. He was quite __63__(surprise), but accepted and thanked me. He said that people didn’t usually do things like this for __64__(strange) -- at least that was what I understood, because he was speaking a really __65__(usual) dialect, and the train was loud.
Then he opened one of his bags and gave me __66__ handful of freshly picked cherries, __67__(explain) that he had just taken then from his orchard. The cherries were really lovely, better than those in the shops, and I enjoyed them very much. It had been just an impulse（冲动）to offer him a piece of chocolate, but if I __68__(do) so, I would never have tasted those lovely cherries, __69__ I didn’t even know he had at the time. Life is about giving and taking, and it’s __70__(general) true that if you give, you will receive.
61.__________ 62.__________ 63.__________ 64.__________ 65.__________ 66.__________ 67.__________ 68.__________ 69.__________ 70.__________ 第四部分写作（共两节，满分35分）
第一节短文改错（共10小题，每小题1分，满分10分）
Here is a funny story. One day three mouses said proudly to each other that they each could
drink more wine, so they decided to have a drinking contest. At last they both felt dizzy. One suggested,“Will anybody go to the wine cellar to fetch another bottle of wine?”The first stood up and down then fell to the ground. The other two laughed and said,“He was drinking and couldn’t walk.”The second stood up. He just made several steps and couldn’t help thrown up. The third laughed hardly and then it was their turn. He stood up and made one step, two steps... Nothing is
wrong. He went straight to the wine cellar but took a bottle of wine. He stood there for while, turned back and said excitedly,“Haha, where is the cat now?”
第二节书面表达（满分25分）
假定你是李华，你的美国朋友Peter一周前给你发电子邮件，询问你暑假里的打算，但你因准备考试未能及时回复。请给他回邮件，说明情况。
注意：1. 可以适当增加细节，以使行文连贯；
2.词数100词左右。
!
参考答案：
第三部分阅读理解
21-25 BCBAB 26-30 DCADA 31-35 BDADB 36-40 FBAGC
第四部分语言知识运用
第一节
41-45 CABDB 46-50 DCDDA 51-55 CBABC 56-60 ABACD
第二节
61.when 62. to 63. surprised 64. strangers 65. unusual 66.a 67. explaining 68. hadn’t done 69. which 70. generally
第五部分写作
第一节
71.mouses -- mice
72.both -- all
73.down删掉
74.drinking -- drunk
75.thrown -- throwing
76.hardly -- hard
77.their -- his
78.is -- was
79.but -- and
80.for a while
第二节
Dear Peter,
How is everything going? I have a couple of things to tell you.
In the first place, I’m sorry for failing to answer your letter in time a week ago. That was because I had to make full preparations for my final exam. I will be much relieved if you could accept my apology.
Secondly, my schedule for the coming summer vacation goes as follows. I’m going to undertake a community survey about neighborhood in an effort to gain some social experience. Following this, a voluntary job is also included in the schedule, which, I think, will definitely enrich my holiday.
What about your holiday plan? Hope to hear from you soon.
Yours,
Li Hua
2017年山西省中考数学试卷(含答案解析版)
2017年山西省中考数学试卷 一、选择题（本大题共10个小题，每小题3分，共30分） 1．（3分）计算﹣1+2的结果是（） A．﹣3 B．﹣1 C．1 D．3 2．（3分）如图，直线a，b被直线c所截，下列条件不能判定直线a与b平行的是（） A．∠1=∠3 B．∠2+∠4=180°C．∠1=∠4 D．∠3=∠4 3．（3分）在体育课上，甲、乙两名同学分别进行了5次跳远测试，经计算他们的平均成绩相同．若要比较这两名同学的成绩哪一个更为稳定，通常需要比较他们成绩的（） A．众数B．平均数C．中位数D．方差 4．（3分）将不等式组2x?6≤0 x+4＞0的解集表示在数轴上，下面表示正确的是（） A．B． C．D．5．（3分）下列运算错误的是（） A．（3﹣1）0=1 B．（﹣3）2÷9 4 = 1 4 C．5x2﹣6x2=﹣x2D．（2m3）2÷（2m） 2=m4 6．（3分）如图，将矩形纸片ABCD沿BD折叠，得到△BC′D，C′D与AB交于点E．若∠1=35°，则∠2的度数为（）
A．20°B．30°C．35°D．55° 7．（3分）化简4x x?4﹣ x x?2 的结果是（） A．﹣x2+2x B．﹣x2+6x C．﹣ x x+2 D． x x?2 8．（3分）2017年5月18日，我国宣布在南海神狐海域成功试采可燃冰，成为世界上首个在海域连续稳定产气的国家．据粗略估计，仅南海北部陆坡的可燃冰资源就达到186亿吨油当量，达到我国陆上石油资源总量的50%．数据186亿吨用科学记数法可表示为（） A．186×108吨B．18.6×109吨 C．1.86×1010吨D．0.186×1011吨 9．（3分）公元前5世纪，毕达哥拉斯学派中的一名成员希伯索斯发现了无理数2，导致了第一次数学危机，2是无理数的证明如下： 假设2是有理数，那么它可以表示成q p （p与q是互质的两个正整数）．于是（ q p ）2= （2）2=2，所以，q2=2p2．于是q2是偶数，进而q是偶数，从而可设q=2m，所以（2m）2=2p2，p2=2m2，于是可得p也是偶数．这与“p与q是互质的两个正整数”矛盾．从而可知“2是有理数”的假设不成立，所以，2是无理数． 这种证明“2是无理数”的方法是（） A．综合法B．反证法C．举反例法D．数学归纳法 10．（3分）如图是某商品的标志图案，AC与BD是⊙O的两条直径，首尾顺次连接点A，B，C，D，得到四边形ABCD．若AC=10cm，∠BAC=36°，则图中阴影部分的面积为（）
2017年宝山区高考数学一模试卷含答案
2017年宝山区高考数学一模试卷含答案 2016.12 一. 填空题（本大题共12题，1-6每题4分，7-12每题5分，共54分） 1. 23lim 1 n n n →∞+=+ 2. 设全集U R =，集合{1,0,1,2,3}A =-，{|2}B x x =≥，则U A C B = 3. 不等式 102 x x +<+的解集为 4. 椭圆5cos 4sin x y θθ=??=?（θ为参数）的焦距为 5. 设复数z 满足23z z i +=-（i 为虚数单位），则z = 6. 若函数cos sin sin cos x x y x x =的最小正周期为a π，则实数a 的值为 7. 若点(8,4)在函数()1log a f x x =+图像上，则()f x 的反函数为 8. 已知向量(1,2)a =，(0,3)b =，则b 在a 的方向上的投影为 9. 已知一个底面置于水平面上的圆锥，其左视图是边长为6的正三角形，则该圆锥的侧面 积为 10. 某班级要从5名男生和2名女生中选出3人参加公益活动，则在选出的3人中男、女生 均有的概率为 （结果用最简分数表示） 11. 设常数0a >，若9()a x x +的二项展开式中5 x 的系数为144，则a = 12. 如果一个数列由有限个连续的正整数组成（数列的项数大于2），且所有项之和为N ， 那么称该数列为N 型标准数列，例如，数列2，3，4，5，6为20型标准数列，则2668型 标准数列的个数为 二. 选择题（本大题共4题，每题5分，共20分） 13. 设a R ∈，则“1a =”是“复数(1)(2)(3)a a a i -+++为纯虚数”的（ ） A. 充分非必要条件 B. 必要非充分条件 C. 充要条件 D. 既非充分又非必要条件 14. 某中学的高一、高二、高三共有学生1350人，其中高一500人，高三比高二少50人， 为了解该校学生健康状况，现采用分层抽样方法进行调查，在抽取的样本中有高一学生120 人，则该样本中的高二学生人数为（ ） A. 80 B. 96 C. 108 D. 110
太原市2017年高三模拟试题(二)
第二部分阅读理解（共两节，60分） 第一节（共15小题，每小题3分，满分45分） A.During the night. B. Only on the three Sundays. C. In the season of spring. D. From 10:00 am to 3:15 pm every day. 22. What can we know from the passage? A.Spring Discovery will be held every the other year. B.The instructors are all experienced adult experts. C.Kestrel might be experienced in holding the camp. D.The entire family is welcome to the Kestrel Sundays. 23. What will the children do in the camp according to the passage? A.Visit the group leaders. B. Learn how to cooperate. C. Plant trees in the forest. D. Help elders to tell stories. B Some scientists will say it is impossible to read minds. They will also tell you that you can make educated guesses on what a person might be thinking or feeling. Perhaps there really is nothing
2017年浦东新区高三数学一模官方定稿版(浦东印稿答案)
浦东新区2016学年度第一学期教学质量检测 高三数学试卷 2016.12 注意：1. 答卷前，考生务必在答题纸上指定位置将姓名、学校、考号填写清楚. 2. 本试卷共有21道试题，满分150分，考试时间120分钟. 一、填空题（本大题共有12题，满分54分）只要求直接填写结果，1-6题每个空格填对 得4分，7-12题每个空格填对得5分，否则一律得零分. 1．已知U =R ，集合{}421A x x x =-≥+，则U A =C ___()1,+∞___. 2．三阶行列式351 2 367 2 4 ---中元素5-的代数余子式的值为___34_____. 3．8 12x ??- ? ?? 的二项展开式中含2x 项的系数是____7_____. 4．已知一个球的表面积为16π，则它的体积为____ 32 3 π____. 5．一个袋子中共有6个球，其中4个红色球，2个蓝色球. 这些球的质地和形状一样，从中任意抽取2个球，则所抽的球都是红色球的概率是_____ 2 5 _____. 6．已知直线l ：0x y b -+=被圆C ：2225x y +=所截得的弦长为6，则b = 7．若复数(1)(2)ai i +-在复平面上所对应的点在直线y x =上，则实数a =___3___. 8 ．函数()cos sin )f x x x x x =+-的最小正周期为___π____. 9．过双曲线C ： 22 214 x y a -=的右焦点F 作一条垂直于x 轴的垂线交双曲线C 的两条渐近线于A 、B 两点，O 为坐标原点，则OAB ?的面积的最小值为___8____. 10．若关于x 的不等式1 202 x x m -- <在区间[0,1]内恒成立， 则实数m 的取值范围为___?? ? ??223 ，__.
江西省宜春市2017届高三模拟考试英语试题
宜春市2017届高三模拟考试英语试卷 本试卷分第I卷（选择题）和第II卷（非选择题）两部分。考试结束后，只需将答题卡交回。 第Ⅰ卷(选择题共100分) 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. How will the girl’s mother pay for the CD? A. In cash. B. By cheque. C. By credit card. 2. What will the speakers do in the afternoon? A. Build a tree house. B. Go mountain biking. C. Play beach volleyball. 3. What does the woman ask the man to do? A. Drive a car. B. Move some boxes. C. Make a phone call. 4. What are the speakers discussing? A. When to watch TV. B. Whether to watch a film. C. What program to watch. 5. Why is the woman disappointed about the restaurant? A. The price is unacceptable. B. The waiter is unfriendly. C. The service is slow. 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。每段对话或独白读两遍。 听第 6 段材料，回答第6、7 题。 6. What are the speakers mainly talking about? A. Weekend plans. B. A city tour. C. Japanese food. 7. Where will the speakers meet on Saturday night?
2017年山西省中考数学试卷(含答案解析)
2017年山西省中考数学试卷 、选择题（本大题共10个小题，每小题3分，共30分） （3分）计算-1+2的结果是 A.Z 仁/ 3 B.Z 2+Z 4=180° C.Z 仁/4 D.Z 3=7 4 3. （3分）在体育课上，甲、乙两名同学分别进行了 5次跳远测试，经计算他们的平均成绩 相同.若要比较这两名同学的成绩哪一个更为稳定，通常需要比较他们成绩的（ 则7 2的度数为（ ） 20° B . 30° C . 35° D . 55° (3分)化简一--的结果是 宀 K -2 5. （3分）下列运算错误的是 （ A . (乙-1) 0=1 B . (- 3) I 2 ) 「J C. 5X 2- 6x 2=- x 2 4 4 D . (2m 3) 2-(2m ) 2=m 4 6. （3分）如图，将矩形纸片ABCD 沿BD 折叠，得到△ BC , C 与AB 交于点E.若/仁35° -3 B .- 1 C . 1 D . 3 a ， b 被直线 c 所截，下列条件不能判定直线a 与b 平行的是（ ） A .众数 B.平均数C .中位数D .方差 x+4>0 4. （3分）将不等式组 I 的解集表示在数轴上，下面表示正确的是（ A . B . ［厶 ........... I, -5-^3-2-1012 34 7. A . A .
8. （3分）2017年5月18日，我国宣布在南海神狐海域成功试采可燃冰，成为世界上首个在 海 域连续稳定产气的国家?据粗略估计，仅南海北部陆坡的可燃冰资源就达到 186亿吨油当 量，达到我国陆上石油资源总量的 50%.数据186亿吨用科学记数法可表示为（ ） A . 186X 108 吨 B . 18.6X 109 吨 C. 1.86X 1010 吨 D . 0.186X 1011 吨 9. （3分）公元前5世纪，毕达哥拉斯学派中的一名成员希伯索斯发现了无理数 「，导致了 第一次数学危机， 匚是无理数的证明如下： 假设 二是有理数，那么它可以表示成’（p 与q 是互质的两个正整数）?于是（J 2 =（匚） P P 2 =2,所以，q 2 =2p 2 .于是q 2 是偶数，进而q 是偶数，从而可设q=2m,所以（2m ） 2 =2p 2 , p 2 =2m 2 ， 于 是可得p 也是偶数?这与“胃q 是互质的两个正整数”矛盾?从而可知“二是有理数”的假 设不成立，所以， 二是无理数. 这种证明“匚是无理数”的方法是（ AC 与BD 是。O 的两条直径，首尾顺次连接点 A ，B ， C, D ,得到四边形ABCD 若AC=10cm / BAC=36,则图中阴影部分的面积为（ A. 5 n crm B. 10 n crm C. 15 n crm D. 20 n crm 二、填空题（本大题共5个小题，每小题3分） 11. （3 分）计算：4 ?二-9 二= ______ . 12. （3分）某商店 经销一种品牌的洗衣机，其中某一型号的洗衣机每台进价为 a 元，商店将 进价提高20%后作为零售价进行销售，一段时间后，商店又以 9折优惠价促销，这时该型号 洗衣机的零售价为 ______ 元. A .综合法 B.反证法 C .举反例法 D.数学归纳法 10. （3分）如图是某商品的标志图案 ,
2017年高考模拟试卷(1)
2017年高考模拟试卷(1) 南通市数学学科基地命题 第Ⅰ卷（必做题，共160分） 一、填空题：本大题共14小题，每小题5分，共70分 ． 1． 已知{}2A x x =＜，{}1B x x =＞ ，则A B = ▲ ． 2． 已知复数z 满足(1i)2i z -=+，则复数z 的实部为 ▲ ． 3． 函数5()log (9)f x x =+ 的单调增区间是 ▲ ． 4． 将一颗质地均匀的正方体骰子（每个面上分别写有数字1，2，3，4，5，6）先后抛掷2次，观 察向上的点数，则点数之和是6的的概率是 ▲ ． 5． 执行如图所示的伪代码，若输出的y 的值为13，则输入的x 的值是 ▲ ． 6． 一种水稻品种连续5年的平均单位面积产量（单位：t/hm 2 ）分别为： 9.4，9.7，9.8，10.3，10.8，则这组样本数据的方差为 ▲ ． 7． 已知函数()sin()(030)f x x ω?ω?=+<<<<π，．若4 x π=-为函数()f x 的 一个零点，3x π=为函数()f x 图象的一条对称轴，则ω的值为 ▲ ． 8． 已知1==a b ，且()()22+?-=-a b a b ，则a 与b 的夹角为 ▲ ． 9． 已知() 0 αβ∈π，，，且()1tan 2 αβ-=，1tan 5β=-，则tan α的值为 ▲ ． 10．已知关于x 的一元二次不等式2 >0ax bx c ++的解集为()1 5-， ，其中a b c ，，为常数．则不等式 2 0cx bx a ++≤的解集为 ▲ ． 11．已知正数x ，y 满足121x y +=，则22log log x y +的最小值为 ▲ ． 12．在平面直角坐标系xOy 中，已知圆C ：22280x y x ++-=，直线l ：(1) ()y k x k =-∈R 过定点A ， 且交圆C 于点B ，D ，过点A 作BC 的平行线交CD 于点E ，则三角形AEC 的周长为 ▲ ． 13．设集合{}*2n A x x n ==∈N ，，集合{}*n B x x b n ==∈N ， 满足A B =? ，且*A B =N ．若对 任意的*n ∈N ，1n n b b +<，则2017b 为 ▲ ． 14．定义：{}max a b ，表示a ，b 中的较大者．设函数{}()max 11f x x x =-+，，2()g x x k =+， 若函数()()y f x g x =-恰有4个零点，则实数k 的取值范围是 ▲ ． （第5题）
山西省2017年中考数学真题试卷和答案
山西省2017年中考数学真题试卷和答案 一、选择题（每小题3分，共30分）。 1．计算﹣1+2的结果是（ ） A ．﹣3 B ．﹣1 C ．1 D ．3 2．如图，直线a ，b 被直线c 所截，下列条件不能判定直线a 与b 平行的是（ ） A ．∠1=∠3 B ．∠2+∠4=180° C ．∠1=∠4 D ．∠3=∠4 3．在体育课上，甲、乙两名同学分别进行了5次跳远测试，经计算他们的平均成绩相同．若要比较这两名同学的成绩哪一个更为稳定，通常需要比较他们成绩的（ ） A ．众数 B ．平均数 C ．中位数 D ．方差 4．将不等式组{2x ?6≤0 x +4＞0的解集表示在数轴上，下面表示正确的是（ ） A ． B ． C ． D ． 5．下列运算错误的是（ ） A ．（√3﹣1）0=1 B ．（﹣3）2÷94=1 4 C ．5x 2﹣6x 2=﹣x 2 D ．（2m 3）2÷（2m ） 2=m 4 6．如图，将矩形纸片ABCD 沿BD 折叠，得到△BC′D ，C′D 与AB 交于点E ．若∠1=35°，则∠2的度数为（ ）
A ．20° B ．30° C ．35° D ．55° 7．化简4x x 2?4﹣x x?2 的结果是（ ） A ．﹣x 2+2x B ．﹣x 2+6x C ．﹣x x+2 D ．x x?2 8．2017年5月18日，我国宣布在南海神狐海域成功试采可燃冰，成为世界上首个在海域连续稳定产气的国家．据粗略估计，仅南海北部陆坡的可燃冰资源就达到186亿吨油当量，达到我国陆上石油资源总量的50%．数据186亿吨用科学记数法可表示为（ ） A ．186×108吨 B ．18.6×109吨 C ．1.86×1010吨 D ．0.186×1011吨 9．公元前5世纪，毕达哥拉斯学派中的一名成员希伯索斯发现了无理数√2，导致了第一次数学危机，√2是无理数的证明如下： 假设√2是有理数，那么它可以表示成q p （p 与q 是互质的两个正整数）．于是 （q p ）2 =（√2）2=2，所以，q 2=2p 2．于是q 2是偶数，进而q 是偶数，从而可设q=2m ，所以（2m ）2=2p 2，p 2=2m 2，于是可得p 也是偶数．这与“p 与q 是互质的两个正整数”矛盾．从而可知“√2是有理数”的假设不成立，所以，√2是无理数． 这种证明“√2是无理数”的方法是（ ） A ．综合法 B ．反证法 C ．举反例法 D ．数学归纳法 10．如图是某商品的标志图案，AC 与BD 是⊙O 的两条直径，首尾顺次连接点A ，B ，C ，D ，得到四边形ABCD ．若AC=10cm ，∠BAC=36°，则图中阴影部分的面积为（ ）
上海市闵行区2017届高三一模数学试卷(含答案)
高三年级质量调研考试数学试卷 第1页共9页 C 1 D 1 B 1 A 1 C A B D E 闵行区2016学年第一学期高三年级质量调研考试 数 学 试 卷 （满分150分，时间120分钟） 考生注意： 1．答卷前，考生务必在答题纸上将学校、班级、考生号、姓名等填写清楚． 2．请按照题号在答题纸各题答题区域内作答，超出答题区域书写的答案无效；在草稿纸、试题卷上答题无效． 3．本试卷共有21道试题． 一、填空题（本大题共有12题，满分54分）考生应在答题纸上相应编号的空格内直接填写结果，第1～6题每个空格填对得4分，第7～12题每个空格填对得5分，否则一律得零分． 1. 方程()lg 341x +=的解=x _____________． 2. 若关于x 的不等式 0x a x b ->-(),a b ∈R 的解集为()(),14,-∞+∞ ，则a b +=____． 3. 已知数列{}n a 的前 n 项和为21n n S =-，则此数列的通项公式为___________． 4. 函数()1f x =的反函数是_____________． 5. () 6 12x +的展开式中3 x 项的系数为___________．（用数字作答） 6. 如右图，已知正方体1111ABCD A BC D -，12AA =， E 为棱1CC 的中点，则三棱锥1D ADE -的体积为________________． 7. 从单词“shadow ”中任意选取4个不同的字母排成一排，则其中含 有“a ”的共有_____________种排法．（用数字作答） 8. 集合[]{} cos(cos )0,0,x x x ππ=∈= _____．（用列举法表示） 9. 如右图，已知半径为1的扇形AOB ，60AOB ∠=?，P 为弧 AB 上的一个动点，则OP AB ? 的取值范围是__________． 10. 已知,x y 满足曲线方程2 21 2x y + =，则22x y +的取值范围是____________．
2017年高考英语模拟试题
2017年高考英语模拟试题 一、单项选择题 1．I don’t know what his interests are, because we talked ______ about work when we met. A.main B. mainly C. major D. Majorly 2．The past year has been successful and, _____ ahead, we expect to do even better in the coming year. A. looking B. to look C. look D. looked 3．__ many times, but she still didn't know how to do it. A. She was taught B. Having taught C. Having been taught D. She has taught 4． —I’m going to Shanghai this afternoon. —________. Then how soon will you come back? A. Have a nice trip B. Congratulations C. Cheers D. Good luck 5．Doing your homework is a sure way to improve your test scores, and this is especially true ____ it comes to classroom tests. A. before B. since C. when D. after 6．Parks are _____ of the few places where people in cities may have sports. A. one B. first C. none D. those 7．The Prime Minister refused to comment on the rumor that he had planned to _____. A. discharge B. dismiss C. resign D. resume 8． 10._________to drugs, he ran out of all his money. A. Having addicted B. Addicted C. To addict D. Addicting 9．Yesterday Mr. Li finally bought his own house, _______ is a hospital. A. in where B. to the east of which C. to the east of it D. in the east of that 10．I don’t believe we’ve met before, ________ I must say you do look familiar. A. therefore B. although C. since D. unless 11．One Friday, we were packing to leave for a weekend away _______ my daughter heard cries for help.
2017年高三数学一模(文科)答案
2017年沈阳市高中三年级教学质量监测（一） 数学（文科）参考答案与评分标准 说明： 一、本解答给出了一种或几种解法供参考，如果考生的解法与本解答不同，可根据试题的主要考查内容比照评分标准制订相应的评分细则. 二、解答右端所注分数，表示考生正确做到这一步应得的累加分数. 三、只给整数分数，选择题和填空题不给中间分. 一、选择题(本大题共12小题，每小题5分，在每小题四个选项中，只有一项是符合题目要求的) 6 二、填空题(本大题共4小题，每小题5分，共20分) 13. 2 3 14. 3 15. 3 16. 9 三、解答题 17. (本小题满分12分) 解：（Ⅰ）设等差数列}{n a 的公差为d ，由题意得23 1 4=-= a a d ， ……………………1分 所以n n d n a a 22)1(2)1(1n =?-+=?-+=． ……………………………………2分 设等比数列}{n b 的公比为q ，由题意得82 5 3 ==b b q ，解得2=q ． ……………………3分 因为22 1== q b b ，所以n n n n q b b 222111=?=?=--． ……………………………………6分 （Ⅱ）2 1) 21(22)22(--?++?= n n n n S 2212-++=+n n n ． ……………………12分 （分别求和每步给2分） 18. (本小题满分12分) 解：（Ⅰ）x 20 50004.0= ? ，∴100=x . ……………………………………1分 ∵1005104020=++++y ，∴25=y . ……………………………………2分 008.05010040=?，005.05010025=?，002.05010010=?，001.050 1005 =?
2017年 高考乐理模拟试题
高考乐理试题 说明：1、本试卷适用于：音乐学专业（方向） 2、考试时间：120分钟 一、填空题（每空1分，共15分） 1、世界上常用的律制有十二平均律、 ___________ 、___________________ 。 2、世界上最早根据数学来制定出十二平均律各音的准确高度的是我国明朝大音 乐家 ___________ 。 3、五线谱里的音符包括三个组成部分，分别是 __________ 、________ 、 和 ________ 。 4、附点的作用是延长前面基本音符 __________ ■勺时间。 5、用来记录音乐的等距离的五条平行横线，叫做 ____________ 。 6、变音记号有五种，分别是__________ 、___________ 、 __________ 、 __________ 、和___________ 。 7、五声调式有 ____ 非本调记谱形式，六声调式有______ 个非本调记谱形式。 二、单项选择题（每题2.5分，共20分） 1、在乐音体系中，七个基本音级的音名顺序是：（） A、C D E F G A B B 、D E F G A B C C、E F G A B C D D 、F G A B C D E 2、在西洋音乐理论体系中, “中央C”为：（
A 、小字一组c B 、小字组c C 、小字二组c D 、大字组C A 、 s B 6在6/8拍子中，整小节休止应记为: 7、 五线谱上出现的“ tr ”字符代表什么意思：( ) A 、乐曲从头反复 B 、乐曲移高八度 C 、滚奏 D 、颤音奏法 8、 自然音程中有几个增音程：( ) A 、2个 B 、1个 C 、3个 D 、4个 三、判断题，将正确的画“"”，错误的画“X” (每题1分，共10分) 1、 在乐曲中，各种拍子交替出现，叫做“混合拍子” ............. ( ) 2、 将自然小调的切级、叫级音都升高半音，这叫做旋律小调。 ......... () 3、 增八度转位后应是减一度，而不是减八度。 ....................... () 4、 ： F — B 是减四度。 ......................................... ( ) 5、 以七和弦的五音为低音，叫“三四和弦”，即七和弦的第二转位。……( ) 6 三个升号是D 大调的调号。 ..................................... ( ) 3、请问“ C — D ： F —A 、 A 大二度小三度纯五度 B C 、大二度小三度减五度 D 4、在下列力度记号中，哪一个表示的力度最弱: 、二度 三度 五度 、大二度小三度增五度 ( ) A pp B 、mp C 、mf D 、ff 5、 F 列符号中哪一个常用的换气标记: 'E — B'的度数是: C A B D
2017年四川省成都市中考数学试卷(含解析)
2017年四川省成都市中考数学试卷 （考试时间：120分钟满分150分） A卷（共100分） 一、选择题（本大题共10小题，每小题3分，共30分） 1．《九章算术》中注有“今两算得失相反，要令正负以名之”，意思是：今有两数若其意义相反，则分别叫做正数与负数，若气温为零上10℃记作+10℃，则﹣3℃表示气温为（） A．零上3℃B．零下3℃C．零上7℃D．零下7℃ 2．如图所示的几何体是由4个大小相同的小立方体组成，其俯视图是（） A．B． C．D． 3．总投资647亿元的西成高铁预计2017年11月竣工，届时成都到西安只需3小时，上午游武侯区，晚上看大雁塔将成为现实，用科学记数法表示647亿元为（） A．647×108B．6.47×109C．6.47×1010D．6.47×1011 4．二次根式中，x的取值范围是（） A．x≥1 B．x＞1 C．x≤1 D．x＜1 5．下列图标中，既是轴对称图形，又是中心对称图形的是（） A．B． C．D．
6．下列计算正确的是（） A．a5+a5＝a10B．a7÷a＝a6C．a3?a2＝a6D．（﹣a3）2＝﹣a6 7．学习全等三角形时，数学兴趣小组设计并组织了“生活中的全等”的比赛，全班同学的比赛结果统计如下表： 得分（分） 60 70 80 90 100 人数（人） 7 12 10 8 3 则得分的众数和中位数分别为（） A．70分，70分B．80分，80分C．70分，80分D．80分，70分 8．如图，四边形ABCD和A′B′C′D′是以点O为位似中心的位似图形，若OA：OA′＝2：3，则四边形ABCD 与四边形A′B′C′D′的面积比为（） A．4：9 B．2：5 C．2：3 D．： 9．已知x＝3是分式方程﹣＝2的解，那么实数k的值为（） A．﹣1 B．0 C．1 D．2 10．在平面直角坐标系xOy中，二次函数y＝ax2+bx+c的图象如图所示，下列说法正确的是（） A．abc＜0，b2﹣4ac＞0 B．abc＞0，b2﹣4ac＞0 C．abc＜0，b2﹣4ac＜0 D．abc＞0，b2﹣4ac＜0 二、填空题（本大题共4小题，每小题4分，共16分） 11．（﹣1）0＝． 12．在△ABC中，∠A：∠B：∠C＝2：3：4，则∠A的度数为． 13．如图，正比例函数y1＝k1x和一次函数y2＝k2x+b的图象相交于点A（2，1），当x＜2时，y1y2．（填
2017年上海市黄浦区高考数学一模试卷(解析版)
2017年上海市黄浦区高考数学一模试卷 一、填空题（本大题共有12题，满分54分.其中第1～6题每题满分54分，第7～12题每题满分54分）考生应在答题纸相应编号的空格内直接填写结果.[ 1．若集合A={x||x﹣1|＜2，x∈R}，则A∩Z=． 2．抛物线y2=2x的准线方程是． 3．若复数z满足（i为虚数单位），则z=． 4．已知sin（α+）=，α∈（﹣，0），则tanα=． 5．以点（2，﹣1）为圆心，且与直线x+y=7相切的圆的方程是． 6．若二项式的展开式共有6项，则此展开式中含x4的项的系数是． 7．已知向量（x，y∈R），，若x2+y2=1，则的最大值为． 8．已知函数y=f（x）是奇函数，且当x≥0时，f（x）=log2（x+1）．若函数y=g （x）是y=f（x）的反函数，则g（﹣3）=． 9．在数列{a n}中，若对一切n∈N*都有a n=﹣3a n ，且 +1 =，则a1的值为． 10．甲、乙两人从6门课程中各选修3门．则甲、乙所选的课程中至多有1门相同的选法共有． 11．已知点O，A，B，F分别为椭圆的中心、左顶点、上顶点、右焦点，过点F作OB的平行线，它与椭圆C在第一象限部分交于点P， 若，则实数λ的值为． 12．已知为常数），，且当x1，x2∈[1，4]时，总有f（x1）≤g（x2），则实数a的取值范围是． 二、选择题（本大题共有4题，满分20分．）每题有且只有一个正确答案，考
生应在答题纸的相应编号上，将代表答案的小方格涂黑，选对得5分，否则一律得零分． 13．若x ∈R ，则“x ＞1”是“ ”的（ ） A ．充分非必要条件 B ．必要非充分条件 C ．充要条件 D ．既非充分也非必要条件 14．关于直线l ，m 及平面α，β，下列命题中正确的是（ ） A ．若l ∥α，α∩β=m ，则l ∥m B ．若l ∥α，m ∥α，则l ∥m C ．若l ⊥α，m ∥α，则l ⊥m D ．若l ∥α，m ⊥l ，则m ⊥α 15．在直角坐标平面内，点A ，B 的坐标分别为（﹣1，0），（1，0），则满足tan ∠PAB?tan ∠PBA=m （m 为非零常数）的点P 的轨迹方程是（ ） A ． B ． C ． D ． 16．若函数y=f （x ）在区间I 上是增函数，且函数在区间I 上是减函数， 则称函数f （x ）是区间I 上的“H 函数”．对于命题：①函数是（0， 1）上的“H 函数”；②函数是（0，1）上的“H 函数”．下列判断正确 的是（ ） A ．①和②均为真命题 B ．①为真命题，②为假命题 C ．①为假命题，②为真命题 D ．①和②均为假命题 三、解答题（本大题共有5题，满分76分．）解答下列各题必须在答题纸相应编号的规定区域内写出必要的步骤． 17．在三棱锥P ﹣ABC 中，底面ABC 是边长为6的正三角形，PA ⊥底面ABC ，且 PB 与底面ABC 所成的角为 ． （1）求三棱锥P ﹣ABC 的体积； （2）若M 是BC 的中点，求异面直线PM 与AB 所成角的大小（结果用反三角函
2017届上海市黄浦区高考二模试卷-(含答案)
黄浦区2016学年第二学期期中 高三年级英语学科教学质量监测试卷 I. Listening Comprehension II. Grammar and Vocabulary Section A Directions: Read the following two passages. Fill in the blanks to make the passage coherent. For the blanks with a given word, fill in each blank with the proper form of the given word. For the other blanks, fill in each blank with one proper word. Make sure that your answers are grammatically correct. Should Children Ban Their Parents from Social Media ? It might be taken for granted –but no previous generation of children will have had the expenence of having their entire childhoods intensively and publicly documented in this way . But the very first people to have had some of their childhood picture s _____21____(post) online are not always happy about their formative years being preserved in digital world . Parents may not realize it , but by posting photos and videos of their online , they are creating an identity for their children ____22_____might not be welcomed . Lucy is a good example . She said she had asked her dad to de-tag her from “stuff that doesn’t necessary represent ___23_____I am now . That’s not something I’d want to remember every time I log on to Facebook -------- It isn’t the best memories , which is the way you ‘d like to reveal ___24_____on social media .” Stones about online privacy are often about children and teenagers being warmed of the dangers of publishing too much personal information online. But in this case it’s their parents who are in the spotlight . For some parents , ____25_____(safe) option is avoiding social media altogether . Kasia Kurowaska from Newcastle is expecting her first child in June and has agreed with her partner Lee to impose a blanket ban _____26____her children are old enough to make their own decision about social media . But she has two big concerns about her plan . Firstly , it will be difficult ____27_____(impose) .”When their auntie comes round and takes a picture , we’re going to have to be like paparazzi police , saying , please don’t put these on Facebook . And secondly , the child might dislike _____28_____(not own ) an oline presence , especially if all of their friends do . But I _____29_____(keep ) a digital record of them . It just won’t have been shared on a platform ____30____the masses. Section B Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need. A. criticize B. desperately C. establish D. feature E. focus F. gratitude G. hearfelt H. humanity I . influence J. present K. touch letters Brought Back to Life Letters as a way of communication have long given way to phone calls and WeChat messages . But a TV shows , Letters Alive , is helping bring this old way to keep in touch back into the ___31___. Letters Alive took it idea from a UK program with a similar name , Letters Live . Both shows _____32__-famous actors and actresses , but there is no gossip , no eye-catching visual effects. Instead , it’s just
2017年山西省中考数学试题(含答案)
2017年山西省中考数学试卷 一、选择题（共10小题，每小题3分，共30分） 1．（3分）（2017?山西）计算﹣2+3的结果是（ ） A ． 1 B ． ﹣1 C ． ﹣5 D ． ﹣6 2．（3分）（2017?山西）如图，直线AB 、CD 被直线EF 所截，AB ∥CD ，∠1=110°，则∠2等于（ ） A ． 65° B ． 70° C ． 75° D ． 80° 3．（3分）（2017?山西）下列运算正确的是（ ） A ． 3a 2 +5a 2=8a 4 B ． a 6?a 2=a 12 C ． （a+b ）2=a 2+b 2 D ． （a 2+1）0 =1 4．（ 3分）（2017?山西）如图是我国古代数学家赵爽在为《周髀算经》作注解时给出的“弦图”，它解决的数学问题是（ ） A ． 黄金分割 B ． 垂径定理 C ． 勾股定理 D ． 正弦定理 5．（3分）（2017?山西）如图是由三个小正方体叠成的一个几何体，它的左视图是（ ） A ． B ． C ． D ． 6．（3分）（2017?山西）我们学习了一次函数、二次函数和反比例函数，回顾学习过程，都是按照列表、描点、连线得到函数的图象，然后根据函数的图象研究函数的性质，这种研究方法主要体现的数学思想是（ ） A ． 演绎 B ． 数形结合 C ． 抽象 D ． 公理化
A．频率就是概率 B．频率与试验次数无关 C．概率是随机的，与频率无关 D．随着试验次数的增加，频率一般会越来越接近概率 8．（3分）（2017?山西）如图，⊙O是△ABC的外接圆，连接OA、OB，∠OBA=50°，则∠C的度数为（） A．30°B．40°C．50°D．80° 9．（3分）（2017?山西）PM2.5是指大气中直径小于或等于2.5μm（1μm=0.000001m）的颗粒物，也称为可入肺颗粒物，它们含有大量的有毒、有害物质，对人体健康和大气环境质量有很大危害．2.5μm用科学记数法可表示为（）A．2.5×10﹣5m B．0.25×10﹣7m C．2.5×10﹣6m D．25×10﹣5m 10．（3分）（2017?山西）如图，点E在正方形ABCD的对角线AC上，且EC=2AE，直角三角形FEG的两直角边EF、EG分别交BC、DC于点M、N．若正方形ABCD的变长为a，则重叠部分四边形EMCN的面积为（） A． a2B． a2 C． a2 D． a2 二、填空题（共6小题，每小题3分，共18分） 11．（3分）（2017?山西）计算：3a2b3?2a2b=_________． 12．（3分）（2017?山西）化简+的结果是_________． 13．（3分）（2017?山西）如图，已知一次函数y=kx﹣4的图象与x轴、y轴分别交于A、B两点，与反比例函数y=在第一象限内的图象交于点C，且A为BC的中点，则k=_________．