2018届北京市各区高三英语一模二模试卷题型分类专题汇编--阅读理解C篇 -学生版(已校对)

第二部分：阅读理解（共两节，40分）

第一节（共15小题；每小题2分，共30分）

阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

C

You can?t walk into the office without Rihanna?s voice singing “work work work work work work” in your head. And that one line from Lady Gaga?s “Bad Romance” still makes you want to scream. These are commonly known as earworm songs—those sticky tunes that continue to play in your head. A recent study finds that more than 90% of adults report hearing earworm songs on a weekly basis.

Fortunately, most people report earworm songs as pleasant. But others find them annoying or even maddening. “Some people are troubled by them to the point that it disturbs life,” says Elizabeth Hellmuth Margulis, a professor at the University of Arkansas who has studied earworm songs.

Margulis says earworm songs tend to have some predictable characteristics. For one thing, they tend to be small parts of a song—not the whole track. And “the songs you?ve heard recently also have the most possibility to get stuck in your memory,” she says.

But sometimes something strange and unpredictable can also start a track playing in your head. “Once I was at the doctor?s office and saw a poster of a man who I thought looked like Gaston—a character from Beauty and the Beast,” Margulis recalls. A coupl e minutes passed, and she realized she couldn?t get “Be Our Guest”, the song in the movie, out of her head, even though she hadn?t thought of the tune in years. In that instance, she was able to identify her earworm?s trigger: the Gaston-looking man in the poster. “But the connections can be really unclear,” she says.

Margulis points out that, in all of human history, recorded music is a very new phenomenon. She says some have inferred that earworm songs are also new—the unintended consequence of being able to hear the same song played everywhere in the same way over and over again. So far, the convincing explanation for why human beings experience earworm songs remains a mystery. But there are some well-established ways to cast off the earworm songs.

“Fi nding a mentally demanding task and putting your mind on it usually shifts attention away

from internal music. People tend to get earworms when performing tasks that don?t require their full attention—stuff like doing the dishes,” Margulis says.

Chewing gu m can also help. When a song is stuck in our heads, it?s almost like we?re singing along with it. If you make your mouth do something else—chewing gum, eating a meal or talking with a friend—that can kick out the earworm.

You could also face your enemy. By listening to the full track that includes the passage stuck in your head, you may find “closure” and relief.

43. Which of the following is most likely to be an earworm song?

A. A song made up of simple words.

B. A song heard frequently these days.

C. A song sung by a most famous singer.

D. A song learned during one?s childhood.

44. What does the underlined word “trigger” in Paragraph 4 mean?

A. Type.

B. Tune.

C. Cause.

D. Characteristic.

45. We can infer that earworm songs may _______.

A. result from modern technology

B. be experienced over meals

C. help regain lost memories

D. hurt one?s hearing

46. What is mainly talked about in the last three paragraphs?

A. Why we hear earworm songs.

B. Where to find earworm songs.

C. When we hear earworm songs.

D. How to get over earworm songs.

第二部分：阅读理解（共两节，40分）

第一节（共15小题；每小题2分，共30分）

阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

C

"When I grow up, I want to be a runner. " These words are spoken by thousands of Kenyan children. 50 percent of the Kenyan top runners are members of Kalenjin, one minority race of the country. They make up less than two percent of Kenya's population. This fact has puzzled sports

scientists. They have spent considerable time and effort trying to answer one question: What enables the Kalenjin people to run so fast?

Although the question seems simple, finding the answer has proven to be difficult and controversial. A team of Danish sports scientists spent 18 months and discovered the Kalenjins had remarkably slow heart rates even when running long distances. The Kalenjins live in high-elevation（高海拔）villages in the Rift Valley in western Kenya. People living at high elevations produce more red blood cells, which aid in the transport of oxygen throughout the body. Because the air is thinner and contains less oxygen at high elevations, the body produces more red blood cells. Scientists believe there is a connection between increased red blood cells and low heart rates and that both may enable high-altitude athletes to outperform those who train at low altitudes. The Danish scientists also studied the bodies of the Kalenjins and compared them to those of the Danes. They found that the Kalenjins have longer "birdlike" legs. The Kalenjins also have lower body mass indexes (a measure of body fat based on weight and height) and shorter bodies than Danish people.

As a result of the Danish study, some scientists made the conclusion that the Kalenjins possess what is called a "speed gene(基因)". However, Kenyan runners were offended by this conclusion They credited their success to hard work and endless hours of training.

Although the controversy over the "speed gene" remains unsolved, British runner Mo Farah's experience offers an interesting perspective on the subject. In 2005, he realized he wasn't meeting his potential as a runner. A group of Kenyan runners were training in England then. After he accidentally observed the Kenyans' strict training routines and dedication to their sport, Farah said it was like a switch had been turned on in his head. He began eating healthy foods, going to bed early, and training harder than he had ever trained in his life. As a result, Farah's running career exploded. He has won seven world and Olympic titles in the 5000m and regularly beats Kenya's top runners!

Farah's story proves what Kenyans have known all along. Regardless of genetics, their success would not be possible without hard work, dedication, sacrifice, and mental toughness. Their "secret" is simple. Train hard, run fast, and never give up.

43. What interested the sports scientists?

A. Kenyan sports history.

B. Kanlenjins' running ability.

C. Kanlenjins' training methods.

D. Kenyans' enthusiasm for sport.

44. According to Danish scientists, what leads to the Kanlenjins' success?

A. Physical condition.

B. Living style.

C. Hard training.

D. Strong will.

45. How did Kenyan runners think about Danish research result?

A. Convincing.

B. Unacceptable.

C. Astonishing.

D. Important.

46. Why is Mo Farah's story mentioned in the passage?

A. To show running methods count.

B. To encourage British athletes.

C. To prove effort pays off.

D. To support gene theory.

第二部分：阅读理解（共两节，40分）

第一节（共15小题；每小题2分，共30分）

阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

C

The online takeaway industry is growing in China along with the rapid development of the Internet economy. But environmental activists complain that the huge volume of plastic utensils (用具), wrapping and containers presents a great challenge to the environment, and that the heavy use of throwaway wooden chopsticks is reducing natural resources.

On September 1, the Beijing No.4 Intermediate People?s Court accepted a lawsuit filed by the Chongqing Green Volunteer League, an environmental non-government organization (NGO), against the country?s three largest food delivery platforms—Baidu Waimai, Ele.me and Meituan. The NGO stated that the companies failed to provide customers with the choice to not receive throwaway plastic utensils along with their food deliveries. Meanwhile, these utensils have created large amounts of rubbish and caused serious ecological damage.

In response, both Meituan and Ele.me, which acquired Baidu Waimai in August, have promised to take measures to reduce plastic waste. Meituan announced that it would appoint a chief environmental officer to oversee environmental issues from plastic waste and upgrade its smartphone app to provide consumers with the option of ordering food without single-use chopsticks, spoons or napkins. Ele.me followed by offering a similar choice and putting forward a

plan to introduce suppliers of degradable (可降解的) plastic utensils to restaurants in the long term.

Is there a possible way out? Combined efforts by delivery platforms, consumers, restaurants and government departments are required to address plastic waste pollution.

For platforms, promoting environmental protection and introducing this idea to consumers are a meaningful move. Moreover, in the future, they should also make strict rules on the use of plastic utensils. For example, no more than one plastic bag should be used to wrap soup dishes, and all plastic products should be degradable. It is a long and difficult task for them, and the recent reactions from Ele.me and Meituan are just beginnings.

Considering most takeout food packaging is thrown into garbage bins and then taken away along with other household garbage, sorting of waste also becomes more important. Government departments could play a major role in this, and by recycling some materials, waste pollution could be reduced and resources saved. Furthermore, there have been growing calls that the government should also invest more in developing degradable plastic products or environmentally friendly alternatives.

Though consumers enjoy the convenience yet also suffer exposure to the pollution, many of them have paid little attention to the plastic waste problem. Environmental groups suggest that consumers change their habits a little by using their own utensils and dishes and refusing unnecessary plastic containers.

43. The Chongqing Green Volunteer League accused the three food delivery platforms of ______.

A. causing damage t o people?s health

B. violating environmental standards

C. using many wooden chopsticks

D. offering no utensil option

44. The author suggests food delivery platforms _____.

A. Raise people?s awareness.

B. Research possible alternatives.

C. Upgrade their application design.

D. Hire a chief environmental officer.

45. Who probably plays a more important role in promoting the categorization of rubbish?

A. government departments

B. food delivery platforms

C. environmental groups

D. fast food restaurants

46. The passage is mainly concerned with _____.

A. why environmental problems arise

B. who food delivery platforms affect most

C. how plastic utensil pollution can be solved

D. what efforts environmental groups have made

第二部分：阅读理解（共两节，40分）

第一节（共15小题；每小题2分，共30分）

阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

C

British anthropologists Russell Hill and Robert Barton of the University of Durham, after studying the results of one-on-one boxing, tae kwon do, Greco-Roman wrestling and freestyle wrestling matches at the Olympic Games, conclude that when two competitors are equally matched in fitness and skill, the athlete wearing red is more likely to win.

Hill and Barton report that when one competitor is much better than the other, colour has no effect on the result. However, when there is only a small difference between them, the effect of colour is enough to tip the balance. The anthropologists say that the number of times red wins is not simply by chance, but that these results are statistically significant.

Joanna Setchell, a primate (灵长目动物) researcher at the University of Cambridge, has found similar results in nature. She studies the large African monkeys known as mandrills. Mandrills have bright red noses that stand out against their white faces. Setchell?s work shows that the powerful males—the ones who are more successful with females—have a brighter red nose than other males.

As well as the studies on primates by Setchell, another study shows the effect of red among birds. In an experiment, scientists put red plastic rings on the legs of male zebra finches and this increased the birds? success with female zebra finches. Zebra finches already have bright red beaks (鸟喙), so this study suggests that, as with Olympic athletes, an extra flash of red is significant. In fact, rese archers from the University of Glasgow say that the birds? brightly coloured beaks are an indicator of health. Jonathan Blount, a biologist, and his colleagues think they have found proof that bright red or orange beaks attract females because they mean that the

males are healthier. Nothing in nature is simple, however, because in species such as the blue footed booby, a completely different colour seems to give the male birds the same advantage with females.

Meanwhile, what about those athletes who win in their events while wearing red? Do their clothes give them an unintentional advantage? Robert Barton accepts that “that is the implication” of their findings. Is it time for sports authorities to consider new regulations on sports clothing?

43. According to their research, Hill and Barton conclude that ________.

A. the colour of clothing has an effect on most sport events

B. red should be the choice of colour for clothing in sports

C. red plays a role when competitors are equally capable

D. athletes performbetter when surrounded by bright red

44. The underlined word “tip” in Paragraph 2 is closest in meaning to ________.

A. achieve

B. seek

C. keep

D. change

45. The example of the blue footed booby proves that __________.

A. male birds use different body parts to draw attention

B. red is not the only colour to attract female birds

C. blue gives female birds the same advantage

D. blue can indicate how healthy a bird is

46. What is the best title for the passage?

A. What Colour Implies More Power?

B. A Tip on Clothing

C. Need to Change the Rules in Sports?

D. Red Is for Winners

第二部分：阅读理解（共两节，40分）

第一节（共15小题；每小题2分，共30分）

阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

C

Senses That Work Together

When we think about how our senses work, we usually imagine them operating separately: you sniff a flower, and the smell is delivered uninterrupted from nose to brain. However, it? s

more complex than that. Most evidence for cross-modal perception (知觉) comes from studies into sound and vision (视觉).But research that shows other senses crossing over is coming out all the time, and it seems that even sound and smell sometimes form an unlikely pairing.

When New York researchers, Daniel Wesson and Donald Wilson, tried to find out the truth about a “ mysterious” area of the brain called the olfactory tubercle, they had to deal with this fact. Originally,they only intended to measure how olfactory tubercle cells in mice responded to smell. But during testing,Wesson noticed that every time he put his coffee cup down, the mouse cells jumped in activity. In fact,the olfactory tubercle is well-placed to receive both smell and sound information from the outside https://www.wendangku.net/doc/e016961700.html,ter they found that among separate cells, most responded to a smell but a significant number were also active when a sound was made. Some cells even behaved differently when smell and sound were presented together, by increasing or decreasing their activity.

Of course, mice aren? t people, so research team has been carrying out further experiments. They pulled together a group of people and gave them various drinks to smell. Participants were asked to sniff the drinks, and then match them to appropriate musical instruments and produce the notes at different levels. The results were interesting: piano was regularly paired with fruity fragrances; strong smells sounded like the instruments that are made of metal.

Further research found that listening to different sounds can change your perceptions. Studying taste this time, the team ordered some special toffee (太妃糖) and put together “ soundscapes” corresponding to bitterness and sweetness. Participants tasted similar pieces of toffee while listening to each soundscape, and found the toffee more bitter or sweeter, depending on which soundtrack they were listening to.

Studies like this are helping scientists correctly describe our understanding of the senses, and how the brain combines them with its advantage. The consequences are worth considering. Could we see musicians work together with chefs to produce sound-improved food and drink? Will you be ordering a coffee with a soundtrack to bring out your favorite smell? Come to think of it, that could be one th ing you hope coffee shop chains don? t get round to.

43. What does the underlined part in Paragraph 2 refer to?

A. A lot of research focuses on the senses.

B. Sound and vision are relatively easy to study.

C. There can be a link between sound and smell.

D. Evidence about the way senses work is hard to obtain.

44. In Wesson and Wilson? s research, ______.

A. the mice were affected more significantly by sound

B. the result confirmed what the researchers had suspected

C. the mice seemed to be afraid of certain sounds or smells

D. the connection between sound and smell was found by chance

45. What is the main idea of Paragraph 3?

A. Participants took an active part in the experiments.

B. The purpose of the further experiments was totally different.

C. The result failed to support what was found in previous experiments.

D. Experiments showed that links between sound and smell were consistent.

46. How does the author feel about the effect of the research?

A. She is excited about the creative chances.

B. She is surprised at the recent developments.

C. She is convinced that the findings will be used soon.

D. She is worried about how the knowledge can be applied.

第二部分：阅读理解（共两节，40分）

第一节（共15小题；每小题2分，共30分）

阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

C

No student of a foreign language needs to be told that grammar is complex. By changing the order of the words and by adding a range of auxiliary verbs (助动词) and suffixes (后缀), we can turn a statement into a question, state whether an action has taken place or is soon to take place, and perform many other word tricks to convey different meanings. However, the question which many language experts can?t understand and explain is—who created grammar?

Some recent languages evolved due to the Atlantic slave trade. Since the slaves didn?t know each other?s languages, they developed a make-shift language called a pidgin. Pidgins are strings

of words copied from the language of the landowners. They have little in the way of grammar, and speakers need to use too many words to make their meaning understood. Interestingly, however, all it takes for a pidgin to become a complex language is for a group of children to be exposed to it at the time when they learn their mother tongue. Slave children didn?t simply copy the strings of words used by their elders. They adapted their words to create an expressive language. In this way complex grammar systems which come from pidgins were invented.

Further evidence can be seen in studying sign languages for the deaf. Sign languages are not simply a group of gestures; they use the same grammatical machinery that is found in spoken languages. The creation of one such language was documented quite recently in Nicaragua. Previously, although deaf children were taught speech and lip reading in the classrooms, in the playgrounds they began to invent their own sign system, using the gestures they used at home. It was basically a pidgin and there was no consistent grammar. However, a new system was born when children who joined the school later developed a quite different sign language. It was based on the signs of the older children, but it was shorter and easier to understand, and it had a large range of special use of grammar to clarify the meaning. What?s more, they all used the signs in the same way. So the original pidgin was greatly improved.

Most experts believe that many of the languages were pidgins at first. They were initially used in different groups of people without standardization and gradually evolved into a widely accepted system. The English past tense－“ed” ending－may have evolved from the verb “do”. “It ended” may once have been “It end-did”. It seems that children have grammatical machinery in their brains. Their minds can serve to create logical and complex structures, even when there is no grammar present for them to copy.

43. What can be inferred about the slaves? pidgin language?

A. It was difficult to understand.

B. It came from different languages.

C. It was created by the landowners.

D. It contained highly complex grammar.

44. What is the characteristic of the new Nicaraguan sign language?

A. No consistent signs were used for communication.

B. Most of the gestures were made for everyday activities.

C. The hand movements were smoother and more attractive.

D. The meaning was clearer than the previous sign language.

2018年全国各地高考数学试题及解答分类汇编大全

2018年全国各地高考数学试题及解答分类汇编大全 （08三角函数 三角恒等变换） 一、选择题 1．（2018北京文）在平面坐标系中，?AB ，?CD ，?EF ，?GH 是圆22 1x y +=上的四段弧（如图），点P 在其中一段上，角α以Ox 为始边，OP 为终边， 若tan cos sin ααα<<，则P 所在的圆弧是（ ） A ．?A B B ．?CD C ．?EF D ．?GH 1．【答案】C 【解析】由下图可得，有向线段OM 为余弦线，有向 线段MP 为正弦线，有向线段AT 为正切线． 2．（2018天津文）将函数sin(2)5y x π=+的图象向右平移10π 个单位长度，所得图象对应的函数（ ） （A ）在区间[,]44ππ - 上单调递增 （B ）在区间[,0]4π 上单调递减 （C ）在区间[,]42 ππ 上单调递增 （D ）在区间[,]2 π π 上单调递减 2．【答案】A 【解析】由函数sin 25y x π? ?=+ ?? ?的图象平移变换的性质可知： 将sin 25y x π? ?=+ ?? ?的图象向右平移10π个单位长度之后的解析式为： sin 2sin 2105y x x ?ππ? ??=-+= ???? ???． 则函数的单调递增区间满足：()22222 k x k k ππ π-≤≤π+∈Z ， 即()44 k x k k ππ π- ≤≤π+∈Z ， 令0k =可得函数的一个单调递增区间为,44ππ?? -????，选项A 正确，B 错误； 函数的单调递减区间满足：()322222 k x k k ππ π+≤≤π+∈Z ， 即()344k x k k πππ+≤≤π+∈Z ，令0k =可得函数的一个单调递减区间为3,44ππ?? ???? ， 选项C ，D 错误；故选A ．

上海市静安区2018届高三英语二模试卷及答案

静安区高三年级英语期中（二模）测试卷（2018.5） I. Listening Comprehension Section A Directions: In Section A, you will hear ten short conversations between two speakers. At the end of each conversation, a question will be asked about what was said. The conversations and the questions will be spoken only once. After you hear a conversation and the question about it, read the four possible answers on your paper, and decide which one is the best answer to the question you have heard. 1. A. By the seaside. B. In a restaurant. C. In a supermarket. D. At home. 2. A. Driving the private car costs little. B. Taking subway requires a special pass. C. It’s more convenient to carry canned fish by pri vate cars. D. It’s uncomfortable to take the subway. 3. A. A phone company clerk. B. A mechanic. C. A travel agent. D. A marriage consultant. 4. A. The woman should go out to work. B. The woman should take charge of the cleaning herself. C. Maids are not very trustworthy these days. D. He contributes a lot to the family economy. 5. A. He is not clever enough for the math club. B. He doesn’t have enough enthusiasm to explore math. C. He lacks former experiences in math study. D. He will be sooner or later admitted into the math club. 6. A. 2. B. 3. C. 5. D. 7. 7. A. The woman was mistaken about where she lost her ipad. B. The woman’s ipad might be kept well in the library. C. There’s a very slight chance of finding back her ipad. D. Her ipad is for public use so she might as well buy a new one. 8. A. As a science fiction fan, she has already seen the film. B. She will go to deal with a dental problem then. C. She will go for a business appointment then. D. She is not very happy to go to see a film with the man. 9. A. Her personal feeling quite contrasts with the research finding. B. Reading books is teenagers’ favourite activity. C. All the researches are offering misleading information. D. Mobile phones have taken none of teenagers’ leisure time. 10. A. Previous customers have bought up the ovens on sale. B. Many other goods on sale are still available. C. The man can buy the oven through other channels. D. The oven is now sold at regular price. Section B Directions: In Section B, you will hear two passages and one longer conversation. After each passage or conversation, you will be asked several questions. The passages

英语阅读理解高频词汇(分类整理)

经济类高频词 1.accelerate vt （使）加速，增速 例：accelerate the rate of economic growth加速经济增长 派：acceleration n 加速accelerating a 加速的 2.boost vt 提高，推动，使增长n 推动，增长 例：boost the economy推动经济增长 派：booster n 支持者，推动器 3.mushroom vi 迅速成长n 蘑菇 例：sth mushroom …快速成长/增加 4.flourish vi 繁荣，茂盛； vt挥动 例：the nation’s economy will flourish国家经济将繁荣发展 5.thrive vi 兴旺，繁荣 例：The company managed to thrive after a recession经济衰退后该公司设法兴旺起来6.impose vt 把…强加于；征税 考：impose on/upon把…强加于 例：to impose local tax征收地方税 派：imposing a 壮观的，令人难忘的 7.restore vt 恢复，修复；归还，交还 例： restore the economy to full strength完全恢复经济发展 派：restoration n 修复 revive v 使复苏vi 恢复 例：The economy of these areas is beginning to revive这些地方的经济开始复苏 8.soar vi 猛增，高飞；（情绪）高涨 例：Oil prices have soared in recent weeks石油价格最近几周飚升 9.squeeze vt 挤，压榨；n 拮据，紧缺；握手 例：financial squeeze财政困难 10.exceed vt 超过，越出 例：The benefits exceed $10 million利润超过1千万美元 派：exceeding a 超过的；exceedingly ad 非常

2018年高考数学试题分类汇编-向量

1 2018高考数学试题分类汇编—向量 一、填空题 1.（北京理6改）设a ，b 均为单位向量，则“33-=+a b a b ”是“a ⊥b ”的_________条件（从“充分而不必要”、“必要而不充分条件”、“充分必要”、“既不充分也不必要”中选择） 1.充分必要 2.（北京文9）设向量a =（1,0），b =（?1,m ）,若()m ⊥-a a b ，则m =_________. 2．-1 3.（全国卷I 理6改）在ABC △中，AD 为BC 边上的中线，E 为AD 的中点，则EB = _________. （用,AB AC 表示） 3．3144 AB AC - 4.（全国卷II 理4）已知向量a ，b 满足||1=a ，1?=-a b ，则(2)?-=a a b _________. 4．3 5.（全国卷III 理13．已知向量()=1,2a ，()=2,2-b ，()=1,λc ．若()2∥c a+b ，则λ=________． 5. 12 6.（天津理8)如图，在平面四边形ABCD 中，AB BC ⊥，AD CD ⊥，120BAD ∠=?，1AB AD ==. 若点E 为边CD 上的动点，则AE BE ?uu u r uu u r 的最小值为_________. 6. 2116 7.（天津文8）在如图的平面图形中，已知 1.2,120OM ON MON ==∠= ,2,2,BM MA CN NA == 则· BC OM 的值为_________. 7.6- 8.（浙江9）已知a ，b ，e 是平面向量，e 是单位向量．若非零向量a 与e 的夹角为π 3，向量b 满足b 2?4e · b +3=0，则|a ?b |的最小值是_________. 8.3?1 9.（上海8）.在平面直角坐标系中，已知点(1,0)A -，(2,0)B ，E 、F 是y 轴上的两个动点，且2EF = ，则AE BF ? 的最小值为_________. 9.-3

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三角函数 1.（2018年全国1文科·8）已知函数()2 2 2cos sin 2f x x x =-+，则 B A ．()f x 的最小正周期为π，最大值为3 B ．()f x 的最小正周期为π，最大值为4 C ．()f x 的最小正周期为2π，最大值为3 D ．()f x 的最小正周期为2π，最大值为4 2.（2018年全国1文科·11）已知角α的顶点为坐标原点，始边与x 轴的非负半轴重合，终 边上有两点()1A a ， ，()2B b ，，且2 cos 23 α=，则a b -= B A ． 15 B C D ．1 3.（2018年全国1文科·16）△ABC 的内角A B C ，，的对边分别为a b c ， ，，已知sin sin 4sin sin b C c B a B C +=，2228b c a +-=，则△ABC 的面积为 ． 4. （2018年全国2文科·7）．在中， ，，则 A A ． B C D ． 5. （2018年全国2文科·10）若在是减函数，则的最大值是 C A ． B ． C ． D ． 6．（2018年全国2文科·15）已知，则 ． 7.（2018年全国3文科·4）若，则 B A ． B ． C ． D ． 8.（2018年全国3文科·6）函数 的最小正周期为 C A ． B ． C ． D ． 9. （2018年全国3文科·11）的内角，，的对边分别为，，．若的面积为，则 C ABC △cos 2C =1BC =5AC =AB =()cos sin f x x x =-[0,]a a π 4 π2 3π4 π5π1tan()45 α-=tan α=1 sin 3 α= cos 2α=8 9 79 7 9 -89 - 2tan ()1tan x f x x =+4 π2 ππ2πABC △A B C a b c ABC △222 4 a b c +-C =

2018年高考数学试题分类汇编_选修 精品

十五、选修4 1.（山东理4）不等式|5||3|10x x -++≥的解集是 A ．[-5，7] B ．[-4，6] C ．(][),57,-∞-+∞ D ．(][),46,-∞-+∞ 【答案】D 2.（北京理5）如图，AD ，A E ，BC 分别与圆O 切于点D ，E ， F ，延长AF 与圆O 交于另一点 G 。给出下列三个结论： ①AD+AE=AB+BC+CA ；②AF· AG=AD·AE ③△AFB ～△ADG 其中正确结论的序号是A ．①② B ．②③C ．①③ D ．①②③ 【答案】A 3.（安徽理5）在极坐标系中，点θρπ cos 2)3,2(=到圆的圆心的距离为 （A ）2 （B ）942π+ （C ）9 12π+ （D ）3【答案】D 4.（北京理3）在极坐标系中，圆ρ=-2sinθ的圆心的极坐标系是 A ．(1,)2π B ．(1,)2π - C ． (1,0) D ．(1，π)【答案】B 5.（天津理11）已知抛物线C 的参数方程为28,8. x t y t ?=?=?（t 为参数）若斜率为1的直线经过抛物线C 的焦点，且与圆()2 224(0)x y r r -+=>相切，则r =________.【答 6.（天津理12）如图，已知圆中两条弦AB 与CD 相交于点F ，E 是AB 延长 线上一点，且::4:2:1.DF CF AF FB BE ===若CE 与圆相切，则线 段CE 的长为__________. 【答案】2 7.（天津理13）已知集合{}1|349,|46,(0,)A x R x x B x R x t t t ??= ∈++-≤=∈=+-∈+∞????，则集合A B ?=________.【答案】{|25}x x -≤≤ 8.（上海理5）在极坐标系中，直线(2cos sin )2ρθθ+=与直线cos 1ρθ=的夹角大小为 。 【答案】arccos 5 9.（上海理10）行列式a b c d （,,,{1,1,2}a b c d ∈-）的所有可能值中，最大的是 。【答案】6 （陕西理15）（考生注意：请在下列三题中任选一题作答，如果多做，则按所做的第一题评10.分） A ．（不等式选做题）若关于x 的不等式12a x x ≥++-存在实数解，则实数a 的取值范围是 。 B ．（几何证明选做题）如图，,,90B D AE B C AC D ∠=∠⊥∠= ，且6,4,12A B A C A D ===，则B E = 。 C ．（坐标系与参数方程选做题）直角坐标系xoy 中，以原点为极点，x 轴的正半轴为极轴建立极坐标系，设点A ，

北京市东城区2018届高三统测(二模)英语试题

北京市东城区2018届高三统测(二模)英语试题 2018.5 英语 本试卷共120分。考试时长100分钟。考生务必将答案答在答题卡上，在试卷上作答无效。考试结束后，将本试卷和答题卡一并交回。 第一部分：知识运用（共两节，45分） 第一节单项填空（共15小题；每小题1分，共15分） 从每题所给的A、B、C、D四个选项中，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。 1.—It’s lucky of you to get your new job! —A friend told me about it, so I _________ and got it. A. apply B. have applied C.applied D. was applying 2. I can clearly remember the first time I met Ms. Lee, _________it’s over 10 years ago. A. unless B. since C. after D. although 3. They will fly to London, ______ they plan to stay for two or three weeks. A. which B. that C. when D. where 4. Dogs have a far wider hearing range than humans, _________ them able to detect sounds far above a human’s hearing limit. A. making B. made C. having made D. to be made 5. —When do you want to visit Mr. Smith with me? —Whenever you _________ time. A. have B. will have C. have had D. had 6. Considered poisonous for many years in Europe, tomatoes _________for decoration only. A. grow B. are grown C. grew D. were grown 7. The snowstorm has lasted for several days _________ it is freezing cold now. A. for B. and C. but D. or 8. In A Brief History of Time, Stephen Hawking wrote _________non-technical terms about the origin and development of the universe. A. from B. by C. in D. with 9. It is almost impossible for planes _________ in such a heavy fog. A. take off B. to take off C. to have taken off D. having taken off 10. According to the Public Library’s regulations, each reader _________borrow at most five books at a time. A. should B. must C. may D. would 11. The book covers the knowledge I wish I ______ five years ago. A. knew B. had known C. would know D. would have known 12. The new theme park, ______ last year, has received 27 million visitors so far. A. open B. opened C. being opened D. to open 13. It is generally believed _________ modern technology and mass media are helping to break traditional cultural boundaries. A. that B. if C. why D. how 14. Jim started to play the guitar at the age of 12 when his uncle gave _________ to him as a present. A. this B. one C. it D. that 15. The ability to make and use tools is one of the most basic characteristics of _________ it means to be human. A. whether B. how C. what D. when 第二节完形填空（共20小题；每小题 1.5分，共30分） 阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项，并在 答题卡上将该项涂黑。 Kate Meyer and Adam Jankowski had just returned to the U.S. after honeymooning in Africa and were waiting out a 10-hour connecting time at Washington-Dulles before they changed the plane to their home in South Carolina. It had been a dream 16 . Along with their memories, they also brought back a