必修二UNIT3单元卷
本试卷分第I卷（选择题）和第II卷（非选择题）两部分。
第Ⅰ卷
第一部分听力（1-20题略）
第二部分阅读理解（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，并在答题卡上将该项涂黑。
A
A good hiking trip should be planned out ahead of time. Whether it is a hike on a mountain trail or through the woods, an enjoyable hiking trip can easily turn into a dangerous situation if safety is not considered well. North Mountain State Park recommends hikers consider the following tips before hitting any trails:
Make a copy of your itinerary to give to a family member or a friend. Make sure that someone close to you knows where you are and how long you will be gone.
Wear a good pair of hiking boots or strong athletic shoes. The right shoes will keep you safe, warm, and comfortable.
Prepare for various types of weather conditions. Check the forecast before you leave; take along sunglasses and extra clothing (e.g., a hat and /or a jacket for a day hike).
Pack plenty of food and water. Consider how long your hike will be and pack accordingly.
Pack basic and necessary supplies. Bring a first-aid kit, a flashlight, a pocket knife, a map of the area (if available), and a compass. You may need other supplies, such as matches, depending on how long your hike will be.
Determine what time the sun sets. This information is available in most local newspapers. Most people become lost after nightfall, so it is important to know this information.
Stay on properly marked trails. Stay on established trails to decrease the chances of becoming lost. Staying on established trails also lowers the risk of doing harm to rare and endangered plants.
Carry a whistle(哨子). Using a loud whistle is a good way to call attention to your location if you get lost.
Keep an eye out for wildlife. Do not approach animals in the wild, even if they seem friendly.
The Washington State Parks and Recreation Commission (WSPRC) manages a diverse system of more than 120 parks. The 90-year-old park system, which receives nearly 48 million visits a year, ranks 4th nationally in day-use attendance, 10th in overnight attendance, and the WSPRC has a smaller budget than most states.
21. The underlined word “itinerary” in Paragraph 2 probably means ________.
A. a phone book
B.a goal
C. a travel plan
D. an address
22. According to the text, if hikers ignore what time the sun sets, they might________. A.need extra clothing B. lose their way
C. be attacked by wild animals
D. have difficulty finding supplies
23. What can we learn about WSPRC?
A. It’ s operat ed very well.
B. It provides search and rescue services.
C. It provides trails and wildlife protection.
D. It’ s only accessible during summer months.
B
The arts, especially music, should be part of every school's lessons at every grade level.Students would be much smarter if they had some musical experience. They could improve their classroom skills, like paying attention and following directions. People develop all these skills when they learn music. Making music also lets children use their imagination. It provides students with a chance to try out their own ideas.
Music not only makes children better students, but also gives them something positive to do. In a music program, children can be part of a band instead of joining a gang (团伙). Parents can enjoy listening to their children's music instead of seeing them glued to a computer or TV screen. In a school band, students get to be part of a team. They can get along well with old friends and make new friends through music.
Music builds self-confidence, too. It gives children a sense of achievement and success. Making music is something for them to be proud of, and it lets kids practice performing in front of an audience. Music gives children an opportunity for self-expression, and that helps develop their self-confidence.
Once again, music is important because it can make children better students, give them something positive to do, and build their character. That is why music should be offered in every single grade in every school.
24.According to the passage, music could make students smarter by _______________.
A. improving their classroom skills and paying attention
B. improving their attention, direction and imagination
C. improving their classroom skills and imagination
D. learning music, making music and trying out their own ideas
25.What does the underlined phrase "glued to" in the second paragraph mean?
A. unwilling to turn on
B. unwilling to leave
C. always looking
D. always playing
26.The third paragraph mainly tells us that music could _______________.
A. give children self-expression and self-confidence
B. bring to children achievement and success
C. give children something to be proud of
D. develop children's self-confidence
27.What's the best title of this passage？
A. Music is a must as a course at school
B. Music builds children's self-confidence
C. Music makes students much smarter
D. Learning music and making music
C
One half of the brain remains on high alert during the first night of sleep in a new space.
Over the course of three experiments on 35 young, healthy volunteers, researchers measured
brain activity during two nights of sleep. They found that part of the left side of the brain remained more active than the right side only on the first night, specifically during a deep sleep stage.
“When you sleep in a new place for the first time, a part of one side of the brain seems to stay awake, so you could wake up faster if necessary,” said senior study author Yuk a Sasaki of Brown University.
While this may be bad news for business travelers who regularly make brief overnight trips, it may not be as troublesome for people who go away for longer periods of time, Sasaki added by email.
To see how being in a strange place affects sleep, Sasaki and colleagues performed a series of lab tests on their subjects.
When they stimulated（刺激）the left side of the brain with sounds in the right ear during deep sleep on the first night, that led to greater possibility of waking and faster action upon waking, than if sounds were played in the left ear to affect the right side of the brain.On the second night, there wasn’t any difference in reactions to tests between the left and right sides of the brain, even during deep sleep.This suggests that there is a first-night-only effect specifically in one side of the brain during deep sleep, the authors conclude.
One limitation of the new study is its focus on healthy volunteers, which means the results may not apply to people with sleep disorders, the authors note.
While it’s possible that the findings may explain poor sleep among frequent travelers, the study wasn’t designed to test whether these “first night effects” continue to happen to people every time they hit the road, said Patrick Finan, a researcher at Johns Hopkins University School of Medicine in Baltimore.
28. If a man sleeps in a new place for the first time, ___________.
A. he can’t fall into deep sleep
B. both sides of his brain are on alert
C. he usually feels unsafe
D. his left side of the brain is highly active
29. What does the underlined word “this” in Paragraph 4 refer to?
A. The finding of the new study.
B. The advice of the researchers.
C. The process of measuring brain activity.
D. The suffering of the volunteers.
30. If people stay at a new place for more than one day,.
A. they can wake faster on the second night than on the first night.
B. there won’t be any difference to them on the second night.
C. they suffer from sleep disorders.
D. the first night effects may not last.
31. What is the problem of the new study? ________
A. All of the volunteers are young.
B.None of the volunteers are sick.
C. The finding may be false
D. There are not enough volunteers.
D
During the past Spring Festival, many children may have received red packets from their families. But Xing Pu, a 40-year-old economist, is asking the government to give red packets to every Chinese citizen.
Xing suggested the government give out 1,000 yuan to each Chinese since the government income has increased rapidly in recent years. He said his suggestion would allow everyone to directly enjoy the fruits of the country's economic success, help the lower-income groups deal with rising prices and increase consumption (消费) around the country.
Recent years have seen the government carry out a series of pro-poor (扶贫) and pro-rural (惠农) policies, including increasing spending on public healthcare and calling off the agricultural tax. But the lower-income group still needs more help while being hit hard by an 11-year high in prices and recent snowstorms.
Xing said while making the draft, he has borrowed many ideas from practices in countries like the United States and Singapore. Earlier this year, the governments of the two nations offered money to their citizens as the result of a surplus in government income. As for in China, "We can even encourage the rich to donate their 1,000 yuan red packet to the poor," said Xing.
Although Xing's suggestion has gained wide support among ordinary Chinese on the Internet, many other economists criticized it as unpractical. Even Xing himself admitted he made the suggestion without any careful calculation. But they agreed with Xing's point that the growing economic pie should be shared among the people.
"To better use the increase of money, handing out money is not a solution that holds good for all time. It could be better to improve the public service or cut the price of energy used in daily life," said QiaoXinsheng, an economic professor.
32. Xing Pu suggested the government give out 1,000 yuan to each Chinese because ______.
A. the poor should get help from the rich
B. the government should help the rich
C. the growing economic pie s hould be shared
D. the government doesn’t know how to use the money
33. What has the government done to help the lower-income group?
A. Spending less on public healthcare.
B. Carrying out pro-poor policies.
C. Handing out money to every Chinese.
D. Increasing the agricultural tax.
34. According to some experts, what is better than giving out money?
A. Increasing the government income.
B. Supplying food to everyone every day.
C. Controlling the rising of prices.
D. Cutting off the price of energy used in daily life.
35. Xing Pu's suggestion ______.
A. caused debates between ordinary people and economics
B. was supported by everyone in the country
C. was supported by the government
D. would be adopted soon
第二节（共5小题；每小题2分，共10分）
根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
A major source of teen stress is school exams, and test anxiety is not uncommon. When you recognize your teen is under stress, how can parents help your teen stay calm before an exam?
Be involved. Parents need to be involved in their teen's work.36What they look for is your presence - to talk, to cry, or simply to sit with them quietly. Communicate openly with your teen. Encourage your teen to express his worries and fears, but don't let them focus on those fears.
Help them get organized.37Together, you and your teen can work out a time-table in which she can study for what she knows will be on the test.
Provide a calm setting. Help your teen set up a quiet place to study and protect his privacy. Give them a nutritious diet. It's important for your teen to eat a healthy, balanced diet during exam times to focus and do her best.38If this happens, encourage your teen to eat light meals or sandwiches. A healthy diet, rather than junk food, is best for reducing stress.
39Persuade your teenager to get some sleep and/or do something active when she needs a real break from studying. Making time for relaxation, fun, and exercise are all important in reducing stress. Help your teen balance her time so that she will feel comfortable taking time out from studying to spend time with friends or rest.
Show a positive attitude.40Your panic, anxiety and blame contribute to your teen’s pressure. Make your teen feel accepted and valued for her efforts. Most importantly, reassure your teen that things will be all right, no matter what the results are.
A. A parent's attitude will dictate their teen's emotions.
B. Exam stress can make some teens lose their appetite.
C. They will only make the situation worse.
D. Encourage your teen to relax.
E. Help your teen think about what she has to study and plan accordingly
F. The best thing is simply to listen.
G. Your teen may also make negative comments about themselves.
.第三部分英语知识运用（共两节，满分45）
第一节完形填空（共20小题；每小题15分，满分30分）
阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
For Nick Vujicic, life was going to be difficult from the day he was born．When Nick arrived into this world, he 41 everyone．He was not like the other babies and it was 42 obvious to his parents and to the doctors in the hospital．
There was no 43 or answers for his condition．Nick was born without any limbs—that is he was born without any arms or legs．But despite being physically 44 , he was mentally 45 and the rest of his body was functioning fine．
46 he had loving parents, Nick would find school hard as he would often be looked down upon by the other children and at the young age of 10, he considered 47 his life by drowning himself in a bathtub．These dark thoughts were 48 by his negative attitude to being disabled and at the time, he thought that he would never be able to do 49 by himself, that he would never have a job and that he would always have to 50 on his parents for help．
Nick was wrong．As an adult, Nick is a successful public speaker and is famous for his motivational 51 which focus on life with a disability, hope and finding meaning in life worldwide．He 52 so many people with the story of his life, how he has 53 so many difficulties and most importantly how he is happy every day．
Despite having no arms or legs, Nick lives 54 , even finding ways to do almost 55 things like brushing his teeth on his own and swimming．He has to work harder than a full bodied person and he achieves his goals．
At the first impression, you may look at Nick and feel 56 ．You may feel sad that this man has no arms or legs and you might feel his 57 and upset that he could find everyday situations difficult．But we should 58 Nick, as he is extremely positive and he gets on with life．He 59 every day and makes the best of what he has: a positive attitude, a creative mind and a powerful 60 ．He also has a very kind and very beautiful wife and they are truly happy and in
第II卷
第二节语法填空（共10小题；每小题1.5分，满分15分）
阅读下面材料，用所给单词的正确形式或适当的单词（不多于一个）填空。
The visit of President Xi Jinping to Britain shows the more frequent communication between
China and Britain. The cultural differences between the two countries have caused a heated ___61___ (discuss).
Table manners are the important process in our daily life. We get used to using chopsticks
___62___ Englishmen use knives and forks. It’s impolite ___63___ (laugh) when you are eating in Britain, which suggests you don’t respect others.___64___ the contrary, we laugh and talk during a meal. What’s more, in Britain, people have to drive along the left side of the road, but traffic in our country ___65___ (keep) to the right. Besides, for Chinese students, what they have experienced in studying is __66___ organized learning way. Students are asked to follow a clear plan.
___67___ (compare) with Chinese education, British education is flexible and ___68___ (imagine). Students there are encouraged to discuss the subject they want to learn. Last but not least, in China, “Thank you” is not frequently used between friends and family members. However, “Thank yo u” is ___69___ (wide) used in Britain.
There is no sense in debating ___70___ is better. We owe these manners to the different history, but you should do as the Romans do.
hundred years his music has made other people happy，too.
第四部分写作（共两节满分35）
第一节：短文改错（10分）
假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号(Λ)，并在其下面写出该加的词。
删除：把多余的词用斜线(＼)划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1.每处错误及其修改均仅限一词；
2.只允许修改10处，多者（从第11处起）不计分。
I still remember how nervously I was on my first day in the new school ten years ago, when I found difficult to follow my teacher in the first English class. The teacher spoke English throughout the class, that was totally different from the lessons I had been taken before. In the morning class the next day, the English teacher came to me while I am reading the text like other student. After listen to me for a while, she gave me a big smile and said she liked her voice very much. The smile shone on the whole day and the following days, as the result of which I began to be confident. A week late, I volunteered to take charge of English study in my class and my English has been improved steadily. 第二节：书面表达（满分25分)
现在，很多学生带手机上学。为此，某英语报在你校组织了一场讨论。讨论的主题：中学生是否有必要带手机上学。请根据下表提供的信息，给报社写一封信，客观的介绍讨论情况。
词数：120词左右
生词提示：攀比：vie vi.
追求时尚：follow the fashion
必修二UNIT3单元卷答案
二阅读21-23 CBA24-27CBDA 28-31 DADB 32-35CBDA 36-40FEBDA 三完形41-45BCBDA 46-50 ADCBC 51-55 AADBC 56-60 BCBAD 四语法
61. discussion62. while63. to laugh64. On 65. keeps66. an67. Compared68. imaginative69. widely70. which
五改错
I still remember how nervously I was on my first day in the new
nervous
school ten years ago, when I found ∧difficult to follow my
a
teacher in the first English class. The teacher spoke English
throughout the class,that was totally different from the
which
lessons I had been taken before. In the morning class the next
day, the English teacher came to me while I am reading the text
was
like other student. After listen to me for a while, she gave
students listening
me a big smile and said she liked her voice very much. The smile
my
shone on the whole day and the following days, as the result
a
of which I began to be confident. A week late, I volunteered
later to take charge of English study in my class and my English has been improved steadily.
六作文
Mobile Phones at school
Dear Editor,
I’m writing to tell you about the discussion we’ve had about whether it is necessary for middle school students to carry mobile phones to school.
The majority of the students think that it is more convenient for them to keep in touch with their parent s and classmates if they have a mobile phone. And what’s more, it’s the latest fashion.
However, most teachers think middle school students are not old enough to control themselves. It is a waste of time for students to play games and send messages to each other by mobile phone. And it easily causes the students to vie with each other. If necessary, they could make phone calls by using public phones on the campus.
In my opinion, following the fashion is understandable. But as middle school students, we should put our heart into our studies.
Yours truly,
Li Hua
必修二UNIT3单元卷答题卡
学校 班级
姓名 考号
Unit 3 How do you get to school？ 一、知识概述 1．学习谈论如何到达某地（交通工具）和表示距离的有关句型。 2．学习how, how long, how far等引导的特殊疑问句。 3．学习和掌握含有实义动词的陈述句、一般疑问句、肯定回答和否定回答之间的转换。 4．会用英语相互谈论交通方式的话题。 二、语音知识 三、单元重难点讲述 1．词汇篇： train—take the train—by train bus—take the bus—by bus subway—take the subway—by subway taxi—take the taxi
—by taxi car—drive the car—by car plane—take the plane —by plane bike—ride a bike—by bike walk—on foot 2．—Hey, Dave. How do you get to school？ 嘿，大卫。你怎样去学校？ —I walk. How about you, Sally？我步行去学校，你呢，萨利？ —I ride my bike. 我骑自行车。 （1）在这个对话中，how的意思是“怎样；怎么；如何”。 e.g.Tell me how to spell it. 告诉我怎么拼写它。 I don’t know how to get to the post office. 我不知道如何去邮局。 除这个意思外，how还可表示“健康情况怎样”。 e.g.How are the children？ 孩子们身体好吗？ （2）get to 到达 表示“到达”这一意思的有三个词组：get to, arrive at/in, reach ① get to是一个常用的词组，比较口语化。 e.g.When does she usually get to school？ 她通常什么时候到校？ ② arrive是不及物动词，其后要接介词at或in，at后接小地点，in后接大地点。 e.g.We will arrive at the village at 5 tomorrow afternoon.
2018-2019学年必修三第二章训练卷 统计(二) 注意事项： 1.答题前,先将自己的姓名、准考证号填写在试题卷和答题卡上,并将准考证号条形码粘贴在答题卡上的指定位置。 2.选择题的作答：每小题选出答案后,用2B 铅笔把答题卡上对应题目的答案标号涂黑,写在试题卷、草稿纸和答题卡上的非答题区域均无效。 3.非选择题的作答：用签字笔直接答在答题卡上对应的答题区域内。写在试题卷、草稿纸和答题卡上的非答题区域均无效。 4.考试结束后,请将本试题卷和答题卡一并上交。 一、选择题(本大题共12个小题,每小题5分,共60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.已知x ,y 是两个变量,下列四个散点图中,x ,y 是负相关趋势的是( ) A. B. C. D. 2.一组数据中的每一个数据都乘以2,再减去80,得到一组新数据,若求得新的数据的平均数是1.2,方差是4.4,则原来数据的平均数和方差分别是( ) A.40.6,1.1 B.48.8,4.4 C.81.2,44.4 D.78.8,75.6 3.某篮球队甲、乙两名运动员练习罚球,每人练习10组,每组罚球40个.命中个数的茎叶图如右图,则下面结论中错误的一个是( ) A.甲的极差是29 B.乙的众数是21 C.甲罚球命中率比乙高 D .甲的中位数是24 4.某学院A ,B ,C 三个专业共有1200名学生,为了调查这些学生勤工俭学的情况,拟采用分层抽样的方法抽取一个容量为120的样本.已知该学院的A 专业有380名学生,B 专业有420名学生,则在该学院的C 专业应抽取的学生人数为( ) A.30 B.40 C.50 D.60 5.在一次歌手大奖赛上,七位评委为某歌手打出的分数如下：9.4、8.4、9.4、9.9、9.6、9.4、9.7,去掉一个最高分和一个最低分后,所剩数据的平均值和方差分别为( ) A.9.4,0.484 B.9.4,0.016 C.9.5,0.04 D.9.5,0.016 6.两个变量之间的相关关系是一种( ) A.确定性关系 B.线性关系 C.非确定性关系 D.非线性关系 7.如果在一次实验中,测得(x ,y )的四组数值分别是A (1,3),B (2,3.8),C (3,5.2),D (4,6),则y 与x 之间的回归直线方程是( ) A.y ＝x ＋1.9 B.y ＝1.04x ＋1.9 C.y ＝0.95x ＋1.04 D.y ＝1.05x －0.9 8.现要完成下列3项抽样调查： ①从10盒酸奶中抽取3盒进行食品卫生检查. ②科技报告厅有32排,每排有40个座位,有一次报告会恰好坐满了听众,报告会结束后,为了听取意见,需要请32名听众进行座谈. ③东方中学共有160名教职工,其中一般教师120名,行政人员16名,后勤人员24名.为了了解教职工对学校在校务公开方面的意见,拟抽取一个容量为20的样本. 较为合理的抽样方法是( ) A.①简单随机抽样,②系统抽样,③分层抽样 B.①简单随机抽样,②分层抽样,③系统抽样 C.①系统抽样,②简单随机抽样,③分层抽样 D.①分层抽样,②系统抽样,③简单随机抽样 9.从存放号码分别为1,2,…,10的卡片的盒子中,有放回地取100次,每次取一张卡片并记下号码,统计结果如下： 此卷只装 订 不 密 封 班级 姓名 准考证号 考场号 座位号
三年级科学期末测试试 题及答案 TTA standardization office【TTA 5AB- TTAK 08- TTA 2C】
2014——2015学年度下学期期末教学质量检测 小学三年级科学试题（卷） 注意事项： 1、本试卷共4页，满分100分，时间60分钟，学生直接在试题上答卷； 2、答卷前将装订线内的项目填写清楚； 一、知识与积累（48分） 1.我会填（每空1分，共18分） ①有些植物可以用（）、茎、（）繁殖后代，但是我们熟悉的绿色开花植物几乎都是从（）开始它们的新生命的。 ②磁性最强的地方是磁铁的（），磁铁指北的磁极叫（）用字母N表示，把指南的磁极叫（）,用（）表示。 ③植物的根能够吸收土壤中的（）和（），满足植物生长的需要，还能将植物（）在土壤中。 ④水的三态分别是：（）、液态、（）。 ⑤生活中你发现，（）、（）、电话、麦克风、耳机里都有大小不一，形状各异的磁铁。 ⑥植物生长所需要的养料是由植物的绿叶依靠（）提供的能量，利用（）和（）制成的。 2.我会判断，对的在后面（）里打“√”，错的在（）里打“×”（每题2分，共16分） ①种子萌发的过程是先萌发出根，再长出茎，根向生下长，速度很快。
②磁铁能吸引铁的性质叫磁性，但是磁铁隔着一些物体就不能吸铁了。 ③对于不同的动物，生命周期的长短和变化是相同的。 ④液态的水降到0℃时就开始凝固成冰。 ⑤人的一生有两副牙齿，一副乳牙，一副恒牙和一副磨牙。 ⑥养蚕、抽取蚕丝织成丝绸，是我国的伟大发明之一。； ⑦物体的冷热程度叫温度，通常用摄氏度℃来表示。 ⑧水在自然界中的三种形态是不能相互转化的。 3.我会选择，把正确答案的序号写在（ ）里（每题2分，共14分） ①自制的指南针为了便于携带，我们可以做成（ ） A.船形式 B.仿古指南鱼形式 C.盒式 ②植物生长所需要的养料大部分是( ) A.自己制造的 B.从土壤中吸收的 C.从空气中吸收的 ③种植凤仙花的正确顺序是（） A. 选种、放土、下种、浇水 B. 选种、下种、放土、浇水 C. 选种、放土、浇水、下种 ④两块不知道磁极的磁铁如果 那么下面判断正确的是：（） A. B. C ⑤蚕的一生经历了出生、生长发育、繁殖、死亡四个 阶段，这个全过程就是蚕的生命周期。蚕的生命周期大约为（）天。 A 、30 B 、56 C 、65 D 、365 ← → ← → → ← → ←
必修3第6章统计参考答案 6.1.1简单随机抽样 1．C2．C3．A4．抽签法，随机数表法，向上、向下、向左、向右 5． 21 6．60,30 7．相等，N n 8．略 9．（1）不是简单随机抽样，由于被抽取样本的总体的个数是无限的而不是有限的。 （2）不是简单随机抽样，由于它是放回抽样 10．选法二不是抽签法，因为抽签法要求所有的签编号互不相同，而选法二中39个白球无法相互区分。这两种选法相同之处在于每名学生被选中的概率都相等，等于40 1。 6.1.2系统抽样 1．A2．B3．B4．B5．A 、B 、D 6．2004 50 7．(一)简单随机抽样 (1) 将每一个人编一个号由0001至1003； (2) 制作大小相同的号签并写上号码； (3) 放入一个大容器，均匀搅拌； (4) 依次抽取10个号签
具有这十个编号的人组成一个样本。 (二)系统抽样 (1)将每一个人编一个号由0001至1003； (2)选用随机数表法找3个号，将这3个人排除； (3)重新编号0001至1000； (4)在编号为0001至0100中用简单随机抽样法抽得一个号L； (5)按编号将：L，100+L，…，900+L共10个号选出。 这10个号所对应的人组成样本。 8．系统抽样适用于总体中的个体数较多的情况；系统抽样与简单随机抽样之间存在着密切联系，即在将总体中的个体均分后的每一段进行抽样时，采用的是简单随机抽样；与简单随机抽样相同的是，系统抽样也属于等可能抽样。 9．是用系统抽样的方法确定的三等奖号码的，共有100个。 10．略(参考第7小题) 6.1.3分层抽样 Nm 1．B2．B3．1044． n 5．70,80 6．系统抽样，100个 7．总体中的个体个数较多，差异不明显； 总体由差异明显的几部分组成 中年：200人；青年：120人；老年：80人 8．分层抽样，简单随机抽样 9．因为总体共有彩电3000台，数量较大，所以不宜采用简单随机抽样，又由于三种彩电的进货数量差异较大，故也不宜用系统方法，而以分层抽样为妥。康佳：38台；海信：16台；熊猫：6台。其中抽取康佳，海信，熊猫彩电的时候可用系统抽样的方法 如果商场进的货是“康佳”“长虹”和“TCL”彩电，因为三者所占的市场分额差异不大，因此可以采用系统抽样法，具体方法略。 6.2.1频率分布表 1．C2．C3．A4．55．1206．0.47．0.148．略 9．频率分布表为：
洛阳市2015-2016学年第一学期期末考试 小学三年级科学（大象版）试卷 姓名：得分： 一、我会填空。（每空2分，共26分） 1、“白云淡，蓝天高，菊花开，落叶飘”，这句话说的是＿＿＿＿＿的景色。 2、人的五官是指＿＿＿、鼻、＿＿＿、＿＿＿、＿＿＿。 3、空气的温度叫＿＿＿，常用的温度单位是“＿＿＿＿”，用符号 “＿＿＿”表示。 4、果实的共同特征是里面都由＿＿＿＿＿和＿＿＿＿＿组成。 5、蚂蚁是群居的昆虫，它们喜欢甜味，用＿＿＿进行交流。 6、猫走路没有声音是因为猫爪上有厚厚的＿＿＿＿＿。 7、鲁班发现有一种草叶子的边缘长者许多小齿，并且会把手划破，受此启发发明＿＿＿。 二、慧眼巧分辨。（每题2分，共计20分） 1、下面是昆虫的是：（） A、蚯蚓 B、蜗牛 C、蜈蚣 D、蜻蜓 2、下列四位朋友中，不能参加过是大会的是：（） A、西瓜 B、葡萄 C、土豆 D、辣椒 3、以下动物不喜欢夜间活动的是：（）
A、公鸡 B、猫 C、蝙蝠 D、猫头鹰 4、下面哪种方法是读气温计的正确方法？（） 5、同一棵树上的树叶被风吹落时，（）叶片会落得慢一些。 A、大的 B、中等的 C、小的 6、下列人类活动中对土壤不会造成破坏的是（）。 A、喷洒农药 B、砍伐森林 C、施用有机肥 7、青蛙过冬的方式是：（） A、冬眠 B、迁徙 C、换毛 D、备粮 8、下面哪个因素不影响自转旋翼的下降速度？（） A、翅膀大小 B、下落高度 C、翅膀形状 D、自身重量 9、小明同学在观察裁员土壤时，不可能发现的物质是（）。 A 、小虫 B 、沙子 C 、蚊子 D 、枯树叶 10、用眼睛、鼻子、舌头辨别物体时的顺序，依次为（）。 A、先看后闻再尝 B、先看后尝再闻 C、先尝后看再闻 三、我当小法官。对的打“√”，错的打“×”（每题2分，共计20分） 1、在每组对比试验中只能有一个不同条件。（）
?哈弗曼编码 A method for the construction of minimum-re-dundancy codes, 耿国华1数据结构1北京:高等教育出版社,2005:182—190 严蔚敏,吴伟民.数据结构(C语言版)[M].北京:清华大学出版社,1997. 冯桂,林其伟,陈东华.信息论与编码技术[M].北京:清华大学出版社,2007. 刘大有,唐海鹰,孙舒杨,等.数据结构[M].北京:高等教育出版社,2001 ?压缩实现 速度要求 为了让它(huffman.cpp)快速运行，同时不使用任何动态库，比如STL或者MFC。它压缩1M数据少于100ms（P3处理器，主频1G）。 压缩过程 压缩代码非常简单，首先用ASCII值初始化511个哈夫曼节点： CHuffmanNode nodes[511]; for(int nCount = 0; nCount < 256; nCount++) nodes[nCount].byAscii = nCount; 其次，计算在输入缓冲区数据中，每个ASCII码出现的频率： for(nCount = 0; nCount < nSrcLen; nCount++) nodes[pSrc[nCount]].nFrequency++; 然后，根据频率进行排序： qsort(nodes, 256, sizeof(CHuffmanNode), frequencyCompare); 哈夫曼树，获取每个ASCII码对应的位序列： int nNodeCount = GetHuffmanTree(nodes); 构造哈夫曼树 构造哈夫曼树非常简单，将所有的节点放到一个队列中，用一个节点替换两个频率最低的节点，新节点的频率就是这两个节点的频率之和。这样，新节点就是两个被替换节点的父
Computers-知识点复习学案 核心单词 1. common adj. 共同的，普遍的；常见的 常用结构： in common 共有，公用(在句中多作状语） have nothing/little/a lot/something in common (with) sb. 与某人没有/许多/有些共同之处 in common with 和……一样 common sense/knowledge 常识 common welfare 公共福利 易混辨析 common/ordinary/usual/normal common 指“共有的，公共的；共同的；常见的”。反义词为rare。 common作“普通的”讲时可与ordinary换用。如“普通人”也可以说成common people。ordinary 意为“普通的，平淡无奇的”，指没有什么特别的地方。 usual 意为“平常的，通常的，一向的”，含惯例之意。 normal 意为“正常的”。 Jane and I have nothing in common. =I have nothing in common with Jane. 我与简毫无共同之处。 The problems are common to all societies. 这些问题是所有社会的通病。 In common with many young people, he prefers pop songs. 和许多年轻人一样，他喜欢流行歌曲。 He is in ordinary clothes. 他穿着平常的衣服。 We meet every day at the usual place. 我们每天在往常那个地方见面。 高手过招 单项填空 Harry visited the bookstore every week. He became such a customer that the bookseller gave him some books as presents. （2009·12·浙江桐庐检测） https://www.doczj.com/doc/6313941591.html,mon B. normal C. usual D. average 解析：选C。由“Harry visited the bookstore every week”可知，他是常客，含有“习惯，惯例”之意，故选C。 2. signal n. 信号；手势；声音；暗号 v. 发信号；用信号传达；用信号与……通讯 A red light is usually a signal for/of danger. 红灯通常是危险的信号。 He signaled (to) the waiter to bring the menu. 他示意服务员把菜单拿过来。 常用结构： signal to sb./sth. for sth.
必修三统计试题 一、选择题（每小题5分，共60分） 1．①某学校高二年级共有526人，为了调查学生每天用于休息的时间，决定抽取10%的学生进行调查；②一次数学月考中，某班有10人在100分以上，32人在90～100分，12人低于90分，现从中抽取9人了解有关情况；③运动会工作人员为参加4×100 m 接力赛的6支队伍安排跑道．就这三件事，恰当的抽样方法分别为( ) A ．分层抽样、分层抽样、简单随机抽样 B ．系统抽样、系统抽样、简单随机抽样 C ．分层抽样、简单随机抽样、简单随机抽样 D ．系统抽样、分层抽样、简单随机抽样 2. 某单位有840名职工，现采用系统抽样方法抽取42人做问卷调查，将840人按1,2，…，840随机编号，则抽取的42人中，编号落入区间[]481,720的人数为 （ ） A ．11 B ．12 C ．13 D ．14 3从2007名学生中选取50名参加全国数学联赛，若采用下面的方法选取：先用简单随机抽样从2007人中剔除7人，剩下的2000人再按系统抽样的方法抽取，则每人入选的可能性( ) A ．不全相等 B ．均不相等 C ．都相等，且为140 D ．都相等，且为50 2007 4. 某大学数学系共有学生5 000人，其中一、二、三、四年级的人数比为4∶3∶2∶1，要 用分层抽样的方法从数学系所有学生中抽取一个容量为200的样本，则应抽取三年级的学生人数为（ ） A.80 B.40 C.60 D.20 5．下列数字特征一定是数据组中数据的是( ) A ．众数 B ．中位数 C ．标准差 D ．平均数 6．某公司10位员工的月工资(单位:元)为1234,,,x x x x ，其均值和方差分别为x 和2 s ,若从下月起每位员工的月工资增加100元,则这10位员工下月工资的均值和方差分别为 （ ） A.2,s 100x + B. 22+100,s 100 x + C.2 ,s x D.2 +100,s x 7.一组数据中的每一个数据都乘以2，再减去80，得到一组新数据，若求得新的数据的平均数是1.2，方差是4.4，则原来数据的平均数和方差分别是( ) A ．40.6,1.1 B ．48.8,4.4 C ．81.2,44.4 D ．78.8,75.6 8.如图所示的茎叶图记录了甲、乙两组各5名工人某日的产量数据(单位:件).若这两组数据的中位数相等,且平均值也相等,则x 和y 的值分别为( ). A.3和5 B.5和5 C.3和7 D.5和7 9.如果在一次实验中，测得(x ，y )的四组数值分别是A (1,3)，B (2,3.8)，C (3,5.2)，
苏教版小学三年级科学下册期末测试2 一、填空 1、用纸巾包住土壤，用手使劲握一握，纸巾（湿）了，说明土壤里有（水分）。 2、将硬土块放入水中，会看到有（气泡）从土块中冒出，说明土壤中含有（空气）。 3、果实一般都有（果皮）和（种子）。 4、有（水分）、（空气）和（适宜的温度），种子才能萌发。 5、像（石头）、（橡皮）、（玻璃）、（塑料）、（丝巾）、（大树）、（螺帽）等形态的物体是（固体）。 6、固体的共同性质是（有固定的形状和体积，不会流动）。 7、我们可以从（气温）、（降水量）、（风向）、（风力）、（湿度）、（云量）等方面来描述天气。 8、150年前，人们预报天气靠（观察周围的）环境来进行。 9、风级歌：（零级）烟柱直冲天，（一级）青烟随风偏，（二级）轻风吹脸面，三级（叶动红旗展），（四级）枝摇飞纸片，五级（带叶小树摇），（六级）举伞步行艰，七级（迎风走不便），（八级）风吹树枝断，九级（屋顶飞瓦），（十级）拔树又倒屋，（十一二级）陆上很少见。 10、（气候特征）是一定地区的规律性天气现象。 二、选择 1、将下列物体的序号填在相应的括号内。 （1）盘子（2）玻璃球（3）果汁（4）大树（5）塑料杯（7）钥匙 （8）橡皮（9）洗发剂（10）钢笔水 固体：（⑴⑵⑷⑸⑺⑻） 液体：（⑶⑼⑽） 2、用腹足爬行的动物是（ｃ） A、蚯蚓 B、蟋蟀 C、蜗牛 13、水结冰的温度是（Ａ）℃。 A 0 B 50 C 100 4、蚕的一生经历了（Ｃ）个阶段。 A 2 B 3 C 4 5、地球上的空气中大约（Ｂ）是氧气。 A全都是B五分之一C五分之四 6、下列图中（ B ）温度计表示零下8摄氏度。
LZ77压缩算法实验报告 一、实验内容 使用C++编程实现LZ77压缩算法的实现。 二、实验目的 用LZ77实现文件的压缩。 三、实验环境 1、软件环境：Visual C++ 6.0 2、编程语言：C++ 四、实验原理 LZ77 算法在某种意义上又可以称为“滑动窗口压缩”，这是由于该算法将一个虚拟的，可以跟随压缩进程滑动的窗口作为术语字典，要压缩的字符串如果在该窗口中出现，则输出其出现位置和长度。使用固定大小窗口进行术语匹配，而不是在所有已经编码的信息中匹配，是因为匹配算法的时间消耗往往很多，必须限制字典的大小才能保证算法的效率；随着压缩的进程滑动字典窗口，使其中总包含最近编码过的信息，是因为对大多数信息而言，要编码的字符串往往在最近的上下文中更容易找到匹配串。 五、LZ77算法的基本流程 1、从当前压缩位置开始，考察未编码的数据，并试图在滑动窗口中找出最长的匹 配字符串，如果找到，则进行步骤2，否则进行步骤3。 2、输出三元符号组( off, len, c )。其中off 为窗口中匹
配字符串相对窗口边 界的偏移，len 为可匹配的长度，c 为下一个字符。然后将窗口向后滑动len + 1 个字符，继续步骤1。 3、输出三元符号组( 0, 0, c )。其中c 为下一个字符。然后将窗口向后滑动 len + 1 个字符，继续步骤1。 六、源程序 /********************************************************************* * * Project description: * Lz77 compression/decompression algorithm. * *********************************************************************/ #include Unit3 Computers知识点详解 Ⅰ. 常考单词必背 1．simplify vt. 简化 Try to simplify your explanation for the children. 设法让你的解释简易一些，让孩子们能听懂。 simplified adj. 简化的simplification n. 简化 2. sum n．总数；算术题；金额v．合计 In sum，the course is clear.总而言之，这个过程是清晰的。 in sum 总之，总而言之sum up 概括；合计 3．intelligence n．智力；聪明；智能 Computer scientists study artificial intelligence.计算机科研人员研究人工智能。intelligent adj. 智能的；聪明的 4. solve vt. 解决；解答Can you help me to solve this maths question? (1) solve/settle/deal with problems 解决问题 (2) solution n. 解决，解答 5．total adj. 总的；整个的n. 总数；合计 In total，they spent 420 hours on the project. totally adv. 完全地；整个地 6．application n．应用；用途；申请 There were more than 300 applications for the six jobs.有300多人申请这6份工作。apply v. 应用，运用，申请，请求 7. explore vt.&vi. 探索；探测；探究 The scientists are exploring all possible ways to improve food production. 科学家们正在探究所有可能提高食品产量的方法。 exploration n. 探索explorer n. 探险者 8. anyhow adv. (也作anyway)无论如何；即使如此 The fog was heavy that day, but anyhow he drove away. 那天的雾很大，但是即使如此他还是开车离开了。 somehow adv. 不知怎么地；以某种方式 somewhat adv. 稍微；有点 9. goal n．目标；目的；球门；(进球)得分 To become an excellent director is her life goal. 成为一名优秀的导演是她的人生目标。 小学三年级期末科学测试题 一、填空 1、绿色开花植物的新生命一般是从开始的，有些植物可以用、、繁殖后代。 2、植物的根能吸收土壤中的和，满足植物生长的需要，还能将植物在土壤中。 3、磁铁上磁力最强的地方叫＿＿＿磁铁有＿＿＿磁极。 4、植物的茎具有及运输和＿＿＿的作用。 5、温度计主要由＿＿＿、＿＿＿、＿＿＿三部分组成。 6、植物的生长过程中需要＿＿﹑＿＿＿﹑＿＿＿＿和＿＿等条件。 7、动物一生经了、、、和四个阶段。 8、蚕的一生经历了蚕卵、、、和四个阶段。是蚕生命周期的开始，的死亡是蚕生命的结束。这种变化叫做。 9、＿＿＿、＿＿＿、＿＿＿可以加快蒸发。 二、选择题 1、蚕蛹经过（）天后会变成蚕蛹。 A 7-8 B 10-15 C 20-25 2、植物的（）可以制造植物生长所需要的营养。 A 绿叶 B 花 C 根 3、36摄氏度可以写成（），零下9摄氏度可以写成（）。 A 36o B 36℃ C 9℃D-9o 4、夏天，在冰棍周围常常可以看到“白气”，这是（） A 冰棍周围的水蒸气B冰棍里水气变成水蒸汽 C 冰棍周围的水蒸气冷却形成的雾状小水滴。 5、在自然条件下，（）植物可以用根﹑茎﹑叶繁殖后代。 A、有些 B、很多 C、6全部 6、蚕的生命是从（)开始的。 A、蚁蚕 B、蚕蛾 C、蚕卵 7、下列动物要经历变态的是（） A、猫 B、鲸 C、蝴蝶 8、测量人体体温的温度计刻度一般在（）之间。 A、0℃---100℃ B、0℃--42℃ C、3℃--42℃ 9、人的一生有（）副牙齿。 A、1. B、2. C、无数 三、判断（对的打“√”，错的打“×”） 1、所有的绿色植物只能用种子来繁育后代。 （） 2、不同植物的种子，它们的形状、大小、颜色等各不相同（） 实验名称：LZSS压缩算法实验报告 一、实验内容 使用Visual 6..0 C++编程实现LZ77压缩算法。 二、实验目的 用LZSS实现文件的压缩。 三、实验原理 LZSS压缩算法是词典编码无损压缩技术的一种。LZSS压缩算法的字典模型使用了自适应的方式，也就是说，将已经编码过的信息作为字典， 四、实验环境 1、软件环境：Visual C++ 6.0 2、编程语言：C++ 五、实验代码 #include -- need byte-swap function for big endian CPU */ #define READ_LE32(X) *(uint32_t *)(X) #define WRITE_LE32(X,Y) *(uint32_t *)(X) = (Y) /* this assumes sizeof(long)==4 */ typedef unsigned long uint32_t; /* text (input) size counter, code (output) size counter, and counter for reporting progress every 1K bytes */ static unsigned long g_text_size, g_code_size, g_print_count; /* ring buffer of size N, with extra F-1 bytes to facilitate string comparison */ static unsigned char g_ring_buffer[N + F - 1]; /* position and length of longest match; set by insert_node() */ static unsigned g_match_pos, g_match_len; /* left & right children & parent -- these constitute binary search tree */ static unsigned g_left_child[N + 1], g_right_child[N + 257], g_parent[N + 1]; /* input & output files */ static FILE *g_infile, *g_outfile; /***************************************************************************** initialize trees *****************************************************************************/ static void init_tree(void) { unsigned i; /* For i = 0 to N - 1, g_right_child[i] and g_left_child[i] will be the right and left children of node i. These nodes need not be initialized. Also, g_parent[i] is the parent of node i. These are initialized to NIL (= N), which stands for 'not used.' For i = 0 to 255, g_right_child[N + i + 1] is the root of the tree for strings that begin with character i. These are initialized to NIL. Note there are 256 trees. */ for(i = N + 1; i <= N + 256; i++) g_right_child[i] = NIL; for(i = 0; i < N; i++) g_parent[i] = NIL; } /***************************************************************************** Inserts string of length F, g_ring_buffer[r..r+F-1], into one of the trees (g_ring_buffer[r]'th tree) and returns the longest-match position and length via the global variables g_match_pos and g_match_len. If g_match_len = F, then removes the old node in favor of the new one, because the old one will be deleted sooner. 《Unit 3 Computers》知识点归纳 一、重点单词（词性变化） 1.order(n.)---(v.) order（命令，点菜） https://www.doczj.com/doc/6313941591.html,pare（v.) ---(n.)comparison 3. speaker(演讲者)---(v.)speak 4.tiny---近义词sm all 5.depend---(adj.)dependent---independent 6.operate---(n.)operation 7.sell---(过去式) sold 8.popular---(n.)popularity 9.aware---(反义词) unaware 10.expensive--- (反义词) cheap 11.mouse---（复数）mice 12.type--- (名词) typist 13.inch--- (复数) inches https://www.doczj.com/doc/6313941591.html,pany---（复数） companies 二、同义词（组）： 1.tiny=very small 2.depend on=need help from 3.operate=make…work 4. realize---notice; know about 5.in addition=besides 6.be good at=do well in 三、重点短语： 1. be unaware of 2. depend on 依靠 3. more than 超过 4. do with 处理 12. have nothing to do 无所事事*17 be made of 5. happen to 发生 6. operate railways 7. in addition 另外 四、重点句子： 1. In t he 1940s, the first computers were bigger than cars. 在20世纪40年代，第一批电脑比汽车还大。 2. You may be unaware of them. 你也许没有意识到他们。 3.You depend on computers more than you realize.你比你意识到的更依赖电脑。 4. What can we do with computers ?我们可以用电脑处理什么？ 5. We can use computers to calculate.我们可以用电脑计算。 6. In addition, computers can do important jobs like ope rating railways and flying planes and spaceships.另外，电脑可以做重要的工作比如操控火车、飞机和飞船。 7. For example, they may be better than doctors at doing their job. 比如，他们比医生更擅长做他们的工作。 8.What will happen to us if computers can do all our jobs?Will we have nothing to do? 如果电脑可以完成我们所有的工作，那我们会发生什么事？我们会不会无事可做？ 五、语法：形容词和副词比较级和最高级的不规则变化 1. good/well---better---the best 2. bad/ill---worse---the worst 3.. much/many---more---the most 4. little ---less---the least 5.. far---farther(further)---the farthest(furthest) More to learn: 1. much, far, a lot (比…得多) a little, a bit(比…一点) even甚至更+比较级 表示不同程度的比较e.g. much older 年长得多 Unit 3 Computers Period 4 Using language教学设计 (ANDY— THE ANDROID) Aims To discuss about IT To write a report about IT To read about androids or robots Procedures I. Warming up by talking about IT What is Information technology? Information technology (IT) or information and communication technology (ICT) is the technology required for information processing. In particular the use of electronic computers and computer software to convert, store, protect, process, transmit, and retrieve information from anywhere, anytime. II. Listening and writing Turn to page 21. Look at the pictures and listen to a conversation about different kinds of information technology or IT, discuss and write down in groups the advantages and disadvantages of each kind. III. Speaking and writing Suppose you and your partner are going to help choose computers for your school. Now talk about the special things each of the computer can do and write a report to your headmaster. IV. Reading, underlining and speaking It is said that computers could be put into androids or robots. Read the text Andy—The Android, 第二章 必修三统计单元测试 一、选择题(本大题共12小题，每小题5分，共60分) 1．从某年级1 000名学生中抽取125名学生进行体重的统计分析，就这个问题来说，下列说法正确的是( ) A ．1 000名学生是总体 B ．每个被抽查的学生是个体 C ．抽查的125名学生的体重是一个样本 D ．抽取的125名学生的体重是样本容量 2．由小到大排列的一组数据x 1，x 2，x 3，x 4，x 5，其中每个数据都小于－1，那么对于样本1，x 1，－x 2，x 3，－ x 4，x 5的中位数可以表示为( ) A.12(1＋x 2) B.12(x 2－x 1) C.12(1＋x 5) D.1 2 (x 3－x 4) 3．某单位有老年人27人，中年人54人，青年人81人，为了调查他们的身体状况的某项指标，需从他们中间抽取一个容量为36的样本，则老年人、中年人、青年人分别应抽取的人数是( ) A ．7,11,19 B ．6,12,18 C ．6,13,17 D ．7,12,17 4．对变量x ，y 有观测数据(x i ，y i )(i ＝1,2，…，10)，得散点图1；对变量u ，v 有观测数据(u i ，v i )(i ＝1,2，…，10)，得散点图2.由这两个散点图可以判断( ) A ．变量x 与y 正相关，u 与v 正相关 B ．变量x 与y 正相关，u 与v 负相关 C ．变量x 与y 负相关，u 与v 正相关 D ．变量x 与y 负相关，u 与v 负相关 5．已知一组数据x 1，x 2，x 3，x 4，x 5的平均数是2，方差是1 3 ，那么另一组数3x 1－2,3x 2－2,3x 3－2,3x 4－2,3x 5－2 的平均数，方差分别是( ) A ．2，13 B ．2,1 C ．4，2 3 D ．4,3 6．某学院有4个饲养房，分别养有18,54,24,48只白鼠供实验用．某项实验需抽取24只白鼠，你认为最合适的抽样方法是( ) A ．在每个饲养房各抽取6只 B ．把所有白鼠都加上编有不同号码的颈圈，用随机抽样法确定24只 C ．从4个饲养房分别抽取3,9,4,8只 D ．先确定这4个饲养房应分别抽取3,9,4,8只，再由各饲养房自己加号码颈圈，用简单随机抽样的方法确定 7．下列有关线性回归的说法，不正确的是( ) A ．相关关系的两个变量不一定是因果关系 B ．散点图能直观地反映数据的相关程度 C ．回归直线最能代表线性相关的两个变量之间的关系 D ．任一组数据都有回归直线方程 8．已知施肥量与水稻产量之间的回归直线方程为y ^ ＝4.75x ＋257，则施肥量x ＝30时，对产量y 的估计值为( ) A ．398.5 B ．399.5 C ．400 D ．400.5 9．在发生某公共卫生事件期间，有专业机构认为该事件在一段时间内没有发生大规模群体感染的标志为“连续10天，每天新增疑似病例不超过7人”．根据过去10天甲、乙、丙、丁四地新增疑似病例数据，一定符合该标志的是( ) A ．甲地：总体均值为3，中位数为4 B ．乙地：总体均值为1，总体方差大于0 C ．丙地：中位数为2，众数为3 D ．丁地：总体均值为2，总体方差为3 10．某高中在校学生2 000人，高一与高二人数相同并都比高三多1人．为了响应“阳光体育运动”号召，学校举行了“元旦”跑步和登山比赛活动．每人都参加而且只参与了其中一项比赛，各年级参与比赛人数情况如下表：Unit3 Computers知识点详解
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