GRE Issue分类

GRE Issue分类
GRE Issue分类

一、反思发展和当代文明7

1. As people rely more and more on technology to solve problems, the ability of humans to think for themselves will surely deteriorate.

26. The luxuries and conveniences of contemporary life prevent people from developing into truly strong and independent individuals.

33. As we acquire more knowledge, things do not become more comprehensible, but more complex and mysterious.

43. The increasingly rapid pace of life today causes more problems than it solves.

93. Unfortunately, in contemporary society, creating an appealing image has become more important than the reality or truth behind that image.

101. Although innovations such as video, computers, and the Internet seem to offer schools improved methods for instructing students, these technologies all too often distract from real learning.

109. Some people believe that scientific discoveries have given us a much better understanding of the world around us. Others believe that science has revealed to us that the world is infinitely more complex than we ever realized.

132. Some people believe that our ever-increasing use of technology significantly reduces our opportunities for human interaction. Other people believe that technology provides us with new and better ways to communicate and connect with one another.

二、主要城市3

2. To understand the most important characteristics of a society, one must study its major cities.

5. Claim: Governments must ensure that their major cities receive the financial support they need in order to thrive.

Reason: It is primarily in cities that a nation's cultural traditions are preserved and generated. 117. It is primarily in cities that a nation's cultural traditions are generated and preserved.

三、教育

I.studying field11

3.35.137. Educational institutions (have a responsibility to/should) dissuade students from pursuing fields of study in which they are unlikely to succeed.

15.98.135.136 Educational institutions should actively encourage their students to choose fields of study (that will prepare them for lucrative careers/in which jobs are plentiful).

20.32.129.(Some people believe that college students should consider only their own talents and interests when choosing a field of study. Others believe that) college students should base their choice of a field of study on the availability of jobs in that field.

39. College students should be encouraged to pursue subjects that interest them rather than the courses that seem most likely to lead to jobs.

II. planning courses3

40. Claim: When planning courses, educators should take into account the interests and suggestions of their students.

Reason: Students are more motivated to learn when they are interested in what they are studying.

47. Educators should find out what students want included in the curriculum and then offer it to them.

90. Educators should take students' interests into account when planning the content of the courses they teach.

III. the same national curriculum4

6.14.96.116. A nation should require all of its students to study the same national curriculum until they enter college.

IV.free university education2

12. Governments should offer a free university education to any student who has been admitted to a university but who cannot afford the tuition.

25. Governments should offer college and university education free of charge to all students.

V.variety of courses10

13.46.102.140. (Some people believe that) universities should require every student to take a variety of courses outside the student's field of study. (Others believe that universities should not force students to take any courses other than those that will help prepare them for jobs in their chosen fields.)

54. In order to become well-rounded individuals, all college students should be required to take courses in which they read poetry, novels, mythology, and other types of imaginative literature.

70. Claim: Universities should require every student to take a variety of courses outside the student's major field of study.

Reason: Acquiring knowledge of various academic disciplines is the best way to become truly educated.

73. Colleges and universities should require all faculty to spend time working outside the academic world in professions relevant to the courses they teach.

112. Requiring university students to take a variety of courses outside their major fields of study is the best way to ensure that students become truly educated.

142. Claim: Colleges and universities should specify all required courses and eliminate elective courses in order to provide clear guidance for students.

Reason: College students—like people in general—prefer to follow directions rather than make their own decisions.

143. No field of study can advance significantly unless it incorporates knowledge and experience from outside that field.

VI. education restrains our minds2

17.68. (Some people believe that the purpose of education is to free the mind and the spirit. Others believe that) formal education tends to restrain our minds and spirits rather than set them free.

VII.positive and negative actions3

24.52.29. The best way to teach(—whether as an educator, employer, or parent—)is to praise positive actions and ignore negative ones.

VIII. Teachers' salaries2

30.83. Teachers' salaries should be based on (their students' academic performance/the academic performance of their students).

IX. assessment of students' learning3

45. Competition for high grades seriously limits the quality of learning at all levels of education.

92. Educators should base their assessment of students' learning not on students' grasp of facts but on the ability to explain the ideas, trends, and concepts that those facts illustrate.

138. Some people believe that competition for high grades motivates students to excel in the classroom. Others believe that such competition seriously limits the quality of real learning.

XI.parents2

81.95. All parents should be required to volunteer time to their children's schools.

XII.study abroad4

82.97.100. Colleges and universities should require their students to spend at least one semester studying in a foreign country.

124. All college and university students would benefit from spending at least one semester studying in a foreign country.

XIII. special talents

37. Society should identify those children who have special talents and provide training for them at an early age to develop their talents.

XIV.teach facts

48. Educators should teach facts only after their students have studied the ideas, trends, and concepts that help explain those facts.

XV. the study of history

57. The main benefit of the study of history is to dispel the illusion that people living now are significantly different from people who lived in earlier times.

74.133.134.Claim: Knowing about the past cannot help people to make important decisions today.

Reason: (The world today is significantly more complex than it was even in the relatively recent past./We are not able to make connections between current events and past events until we have some distance from both.)

XVI. Learning is a matter of personal discipline

58. Learning is primarily a matter of personal discipline; students cannot be motivated by school or college alone.

四、艺术

I.funding of the arts

7. Some people believe that government funding of the arts is necessary to ensure that the arts can flourish and be available to all people. Others believe that government funding of the arts threatens the integrity of the arts.

80.88. Claim: Nations should suspend government funding for the arts when significant numbers of their citizens are hungry or unemployed.

(Reason: It is inappropriate—and, perhaps, even cruel—to use public resources to fund the arts when people's basic needs are not being met.)

II. work of art merit

55. In order for any work of art—for example, a film, a novel, a poem, or a song—to have merit, it must be understandable to most people.

五、保护环境6

10. Nations should pass laws to preserve any remaining wilderness areas in their natural state, even if these areas could be developed for economic gain.

31. Society should make efforts to save endangered species only if the potential extinction of those species is the result of human activities.

63. There is little justification for society to make extraordinary efforts—especially at a great cost in money and jobs—to save endangered animal or plant species.

67. Some people believe that society should try to save every plant and animal species, despite the expense to humans in effort, time, and financial well-being. Others believe that society need not make extraordinary efforts, especially at a great cost in money and jobs, to save endangered species.

125. Some people claim that a nation's government should preserve its wilderness areas in their natural state. Others argue that these areas should be developed for potential economic gain. 148. Nations should pass laws to preserve any remaining wilderness areas in their natural state.

六、科学研究4

23. Governments should place few, if any, restrictions on scientific research and development. 36.72. Governments should not fund any scientific research whose consequences are unclear. 59. Scientists and other researchers should focus their research on areas that are likely to benefit the greatest number of people.

91. The primary goal of technological advancement should be to increase people's efficiency so that they have more leisure time.

131.Claim: Researchers should not limit their investigations to only those areas in which they expect to discover something that has an immediate, practical application.

Reason: It is impossible to predict the outcome of a line of research with any certainty.

七、社会

I.scandal

4. Scandals are useful because they focus our attention on problems in ways that no speaker or reformer ever could.

II.question authority

18. The well-being of a society is enhanced when many of its people question authority.

42. Students should always question what they are taught instead of accepting it passively.

https://www.360docs.net/doc/6e7332723.html,ws

21. Laws should be flexible enough to take account of various circumstances, times, and places.

65. Every individual in a society has a responsibility to obey just laws and to disobey and resist unjust laws.

89. Claim: Many problems of modern society cannot be solved by laws and the legal system. Reason: Laws cannot change what is in people's hearts or minds.

IV.Heroes and role models

22. Claim: The best way to understand the character of a society is to examine the character of the men and women that the society chooses as its heroes or its role models.

Reason: Heroes and role models reveal a society's highest ideals.

44. Claim: It is no longer possible for a society to regard any living man or woman as a hero. Reason: The reputation of anyone who is subjected to media scrutiny will eventually be diminished.

75. In this age of intensive media coverage, it is no longer possible for a society to regard any living man or woman as a hero.

84. It is no longer possible for a society to regard any living man or woman as a hero.

122. The best way to understand the character of a society is to examine the character of the men and women that the society chooses as its heroes or its role models.

V.general welfare

28.127. The surest indicator of a great nation is (represented not by/not) the achievements of its rulers, artists, or scientists, but (by) the general welfare of (all) its people.

85. Some people believe that in order to thrive, a society must put its own overall success before the well-being of its individual citizens. Others believe that the well-being of a society can only be measured by the general welfare of all its people.

94.147. The effectiveness of a country's leaders is best measured by examining the well-being of that country's citizens.

113. Claim: The surest indicator of a great nation is not the achievements of its rulers, artists, or scientists.

Reason: The surest indicator of a great nation is actually the welfare of all its people.

120. Claim: The surest indicator of a great nation must be the achievements of its rulers, artists, or scientists.

Reason: Great achievements by a nation's rulers, artists, or scientists will ensure a good life for the majority of that nation's people.

121. Some people claim that you can tell whether a nation is great by looking at the achievements of its rulers, artists, or scientists. Others argue that the surest indicator of a great nation is, in fact, the general welfare of all its people.

145. The general welfare of a nation's people is a better indication of that nation's greatness than are the achievements of its rulers, artists, or scientists.

VI. step down3

8.111.149. In any (profession/field)—business, politics, education, government—those in power should (be required to)step down after five years.

(Reason: The surest path to success for any enterprise is revitalization through new leadership.)

八、政治

I.political leaders

16. Some people believe that in order to be effective, political leaders must yield to public opinion and abandon principle for the sake of compromise. Others believe that the most essential quality of an effective leader is the ability to remain consistently committed to particular principles and objectives.

50.115. Government officials should rely on their own judgment rather than unquestioningly carry out the will of the people they serve.

69. Some people believe it is often necessary, even desirable, for political leaders to withhold information from the public. Others believe that the public has a right to be fully informed.

86. Some people believe that government officials must carry out the will of the people they serve. Others believe that officials should base their decisions on their own judgment.

114. Any leader who is quickly and easily influenced by shifts in popular opinion will accomplish little.

139. Claim: Major policy decisions should always be left to politicians and other government experts.

Reason: Politicians and other government experts are more informed and thus have better judgment and perspective than do members of the general public.

https://www.360docs.net/doc/6e7332723.html,mon ground and reasonable consensus

60. Politicians should pursue common ground and reasonable consensus rather than elusive ideals.

III.Leaders are created

62. Leaders are created by the demands that are placed on them.

IV.ethical and moral standards.

104.107. To be an effective leader, a public official must maintain the highest ethical and moral standards.

V.immediate problems

19. Governments should focus on solving the immediate problems of today rather than on trying to solve the anticipated problems of the future.

VI.cooperation&competition

123. The best way for a society to prepare its young people for leadership in government, industry, or other fields is by instilling in them a sense of cooperation, not competition.

128. Some people argue that successful leaders in government, industry, or other fields must be highly competitive. Other people claim that in order to be successful, a leader must be willing and able to cooperate with others.

九、个人发展

11.99. People's behavior is largely determined by forces not of their own making.

78. People's attitudes are determined more by their immediate situation or surroundings than by society as a whole.

38. It is primarily through our identification with social groups that we define ourselves.

41. The greatness of individuals can be decided only by those who live after them, not by their contemporaries.

51.71. Young people should be encouraged to pursue long-term, realistic goals rather than seek immediate fame and recognition.

53. If a goal is worthy, then any means taken to attain it are justifiable.

61. People should undertake risky action only after they have carefully considered its consequences.

141. It is more harmful to compromise one's own beliefs than to adhere to them.

144. True success can be measured primarily in terms of the goals one sets for oneself.

十、不同意见

34. In any situation, progress requires discussion among people who have contrasting points of view.

49.76.118. Claim: We can (usually) learn much more from people whose views we share than from those whose views contradict our own.

(Reason: Disagreement can cause stress and inhibit learning.)

79.146. Claim: The best test of an argument is (its/the argument's) ability to convince someone with an opposing viewpoint.

(Reason: Only by being forced to defend an idea against the doubts and contrasting views of others does one really discover the value of that idea.)

十、其他

H. past achievements

9. In any field of endeavor, it is impossible to make a significant contribution without first being strongly influenced by past achievements within that field.

V. beginner and expert

27. In any field of inquiry, the beginner is more likely than the expert to make important contributions.

K1. discoveries or creations are accidental

56. Many important discoveries or creations are accidental: it is usually while seeking the answer to one question that we come across the answer to another.

R1. mind will always be superior to machines

64. The human mind will always be superior to machines because machines are only tools of

human minds.

66. People who are the most deeply committed to an idea or policy are also the most critical of it.

77. The most effective way to understand contemporary culture is to analyze the trends of its youth.

87. Claim: Any piece of information referred to as a fact should be mistrusted, since it may well be proven false in the future.

Reason: Much of the information that people assume is factual actually turns out to be inaccurate.

103. The best ideas arise from a passionate interest in commonplace things.

105. Claim: Imagination is a more valuable asset than experience.

Reason: People who lack experience are free to imagine what is possible without the constraints of established habits and attitudes.

106.126. In most professions and academic fields, imagination is more important than knowledge.

108.110. Critical judgment of work in any given field has little value unless it comes from someone who is an expert in that field.

119. When old buildings stand on ground that modern planners feel could be better used for modern purposes, modern development should be given precedence over the preservation of historic buildings.

130. Some people believe that corporations have a responsibility to promote the well-being of the societies and environments in which they operate. Others believe that the only responsibility of corporations, provided they operate within the law, is to make as much money as possible.

2020年高考物理试题分类汇编:电路(带详细解析)

2020年高考物理试题分类汇编:电路(带详细解析) 〔新课标卷〕19.电源的效率η定义为外电路电阻消耗的功率与电源的总功率之比.在测电源电动势和内电阻的实验中得到的实验图线如下图,图中U 为路端电压,I 为干路电流,a 、b 为图线上的两点,相应状态下电源的效率分不为a η、b η.由图可知a η、b η的值分不为 A 、34、14 B 、13、23 C 、12、12 D 、23、13 答案:D 解析:电源效率E U = η,E 为电源的总电压〔即电动势〕,依照图象可知U a =E 32 U b =E 3 1,因此选项D 正确。 〔上海理综〕41.中国馆、世博中心和主题馆等要紧场馆,太阳能的利用规模达到了历届世博会之最,总发电装机容量达到4.6×103kW 。设太阳能电池板的发电效率为18%,地球表 面每平方米接收太阳能的平均辐射功率为 1.353kW ,那么所使用的太阳能电池板的总面积为 m 2。 答案:1.9×1014 〔上海理综〕42.各场馆的机器人专门引人注目。在以下图设计的机器人模块中,分不填入传感器和逻辑门的名称,使该机器人能够在明亮的条件下,听到呼吁声就来为你服务。

答案:光;声;与〔&〕 〔上海理综〕44.在世博园区,运行着许多氢燃料汽车,其动力来源是氢燃料电池〔结构如图〕。 〔1〕以下是估测氢燃料电池输出功率的实验步骤: ①把多用表的选择开关调至电流档,并选择恰当量程,串联在电路中。读出电流I; ②把多用表的选择开关调至电压档,把红、黑表笔并联在电动机两端,其中红表笔应该接在图中〔填〝A〞或〝B〞〕端。读出电压U; ③重复步骤①和②,多次测量,取平均值; ④依照公式P= 运算氢燃料电池输出功率。 〔2〕在上述第②步中遗漏的操作是; 〔3〕假如该电动机的效率为η,汽车运动的速度为v,那么汽车的牵引力为。 答案:〔1〕A;UI;(2)选择恰当量程;〔3〕 UI v η 〔上海物理〕5. 在图的闭合电路中,当滑片P向右移动时,两电表读数的变化是 〔A〕○A变大,○V变大〔B〕○A变小,○V变大 〔C〕○A变大,○V变小〔D〕○A变小,○V变小答案:B

【高考真题】2016---2018三年高考试题分类汇编

专题01 直线运动 【2018高考真题】 1.高铁列车在启动阶段的运动可看作初速度为零的均加速直线运动,在启动阶段列车的动能() A. 与它所经历的时间成正比 B. 与它的位移成正比 C. 与它的速度成正比 D. 与它的动量成正比 【来源】2018年全国普通高等学校招生统一考试物理(新课标I卷) 【答案】 B 2.如图所示,竖直井中的升降机可将地下深处的矿石快速运送到地面。某一竖井的深度约为104m,升降机运行的最大速度为8m/s,加速度大小不超过,假定升降机到井口的速度为零,则将矿石从井底提升到井口的最短时间是 A. 13s B. 16s C. 21s D. 26s 【来源】浙江新高考2018年4月选考科目物理试题 【答案】 C

【解析】升降机先做加速运动,后做匀速运动,最后做减速运动,在加速阶段,所需时间 ,通过的位移为,在减速阶段与加速阶段相同,在匀速阶段所需时间为:,总时间为:,故C正确,A、B、D错误;故选C。 【点睛】升降机先做加速运动,后做匀速运动,最后做减速运动,根据速度位移公式和速度时间公式求得总时间。 3.(多选)甲、乙两汽车同一条平直公路上同向运动,其速度—时间图像分别如图中甲、乙两条曲线所示。已知两车在t2时刻并排行驶,下列说法正确的是() A. 两车在t1时刻也并排行驶 B. t1时刻甲车在后,乙车在前 C. 甲车的加速度大小先增大后减小 D. 乙车的加速度大小先减小后增大 【来源】2018年普通高等学校招生全国统一考试物理(全国II卷) 【答案】 BD 点睛:本题考查了对图像的理解及利用图像解题的能力问题

4.(多选)地下矿井中的矿石装在矿车中,用电机通过竖井运送至地面。某竖井中矿车提升的速度大小v随时间t的变化关系如图所示,其中图线①②分别描述两次不同的提升过程,它们变速阶段加速度的大小都相同;两次提升的高度相同,提升的质量相等。不考虑摩擦阻力和空气阻力。对于第①次和第②次提升过程, A. 矿车上升所用的时间之比为4:5 B. 电机的最大牵引力之比为2:1 C. 电机输出的最大功率之比为2:1 D. 电机所做的功之比为4:5 【来源】2018年全国普通高等学校招生统一考试物理(全国III卷) 为2∶1,选项C正确;加速上升过程的加速度a1=,加速上升过程的牵引力F1=ma1+mg=m(+g),减速上升过程的加速度a2=-,减速上升过程的牵引力F2=ma2+mg=m(g -),匀速运动过程的牵引力F 3=mg。第次提升过程做功W1=F1××t0×v0+ F2××t0×v0=mg v0t0;第次提升过 程做功W2=F1××t0×v0+ F3×v0×3t0/2+ F2××t0×v0 =mg v0t0;两次做功相同,选项D错误。

2019-2020高考数学试题分类汇编

2019---2020年真题分类汇编 一、 集合(2019) 1,(全国1理1)已知集合}242{60{}M x x N x x x =-<<=--<,,则M N = A .}{43x x -<< B .}42{x x -<<- C .}{22x x -<< D .}{23x x << 2,(全国1文2)已知集合{}{}{}1,2,3,4,5,6,72,3,4,52,3,6,7U A B ===,,,则U B A = A .{}1,6 B .{}1,7 C .{}6,7 D .{}1,6,7 3,(全国2理1)设集合A ={x |x 2–5x +6>0},B ={x |x –1<0},则A ∩B = A .(–∞,1) B .(–2,1) C .(–3,–1) D .(3,+∞) 4,(全国2文1)已知集合={|1}A x x >-,{|2}B x x =<,则A ∩B = A .(-1,+∞) B .(-∞,2) C .(-1,2) D .? 5,(全国3文、理1)已知集合2{1,0,1,2}{|1}A B x x =-=≤,,则A B = A .{}1,0,1- B .{}0,1 C .{}1,1- D .{}0,1,2 6,(北京文,1)已知集合A ={x |–11},则A ∪B = (A )(–1,1) (B )(1,2) (C )(–1,+∞) (D )(1,+∞) 7,(天津文、理,1)设集合{1,1,2,3,5},{2,3,4},{|13}A B C x x =-==∈≤∈R ,则A B = . 10,(上海1)已知集合{1A =,2,3,4,5},{3B =,5,6},则A B = . 一、 集合(2020) 1.(2020?北京卷)已知集合{1,0,1,2}A =-,{|03}B x x =<<,则A B =( ). A. {1,0,1}- B. {0,1} C. {1,1,2}- D. {1,2} 2.(2020?全国1卷)设集合A ={x |x 2–4≤0},B ={x |2x +a ≤0},且A ∩B ={x |–2≤x ≤1},则 a =( ) A. –4 B. –2 C. 2 D. 4 3.(2020?全国2卷)已知集合U ={?2,?1,0,1,2,3},A ={?1,0,1},B ={1,2},则()U A B ?=( ) A. {?2,3} B. {?2,2,3} C. {?2,?1,0,3} D. {?2,?1,0,2,3} 4.(2020?全国3卷)已知集合{(,)|,,}A x y x y y x =∈≥*N ,{(,)|8}B x y x y =+=,则A B 中元素的个数为( ) A. 2 B. 3 C. 4 D. 6 5.(2020?江苏卷)已知集合{1,0,1,2},{0,2,3}A B =-=,则A B =_____.

2019年高考真题分类汇编(全)

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2020年高考试题分类汇编 化学平衡

2020年高考试题分类汇编 化学平衡题 1.[2020全国新课标Ⅰ28](14分) 硫酸是一种重要的基本化工产品,接触法制硫酸生产中的关键工序是SO2的催化氧化: SO2(g)+1 2 O2(g)SO3(g) ΔH=?98 kJ·mol?1。回答下列问题: (1)钒催化剂参与反应的能量变化如图(a)所示,V2O5(s)与SO2(g)反应生成VOSO4(s)和V2O4(s)的热化学方程式为:_________________。 (2)当SO2(g)、O2(g)和N2(g)起始的物质的量分数分别为7.5%、10.5%和82%时,在0.5MPa、2.5MPa和5.0MPa压强下,SO2平衡转化率α随温度的变化如图(b)所示。反应在5.0MPa、550℃时的α=__________,判断的依据是__________。影响α的因素有__________。 (3)将组成(物质的量分数)为2m% SO2(g)、m% O2(g)和q% N2(g)的气体通入反应器,在温度t、压强p条件下进行反应。平衡时,若SO2转化率为α,则SO3压强为___________,平衡常数K p=___________(以分压表示,分压=总压×物质的量分数)。 (4)研究表明,SO2催化氧化的反应速率方程为: v=k(α α' ?1)0.8(1?nα') 式中:k为反应速率常数,随温度t升高而增大;α为SO2平衡转化率,α'为某时刻SO2转化率,n为常数。在α'=0.90时,将一系列温度下的k、α值代入上述速率方程,得到v~t 曲线,如图(c)所示。

曲线上v 最大值所对应温度称为该α'下反应的最适宜温度t m 。t t m 后,v 逐渐下降。原因是__________________________。 【答案】(1)2V 2O 5(s)+ 2SO 2(g)=2VOSO 4(s)+V 2O 4(s) ΔH =?351 kJ·mol ?1 (2)0.975 该反应气体分子数减少,增大压强,α提高。5.0MPa>2.5MPa = p 2,所以p 1= 5.0Mpa 温度、压强和反应物的起始浓度(组成) (3)2100m m p α α- 1.50.5 (1)()100p m m α αα-- (4)升高温度,k 增大使v 逐渐提高,但α降低使v 逐渐下降。t t m 后,k 增大对v 的提高小于α引起的降低 2.[2020全国新课标Ⅱ 28](14分) 天然气的主要成分为CH 4,一般还含有C 2H 6等烃类,是重要的燃料和化工原料。 (1)乙烷在一定条件可发生如下反应:C 2H 6(g)= C 2H 4(g)+H 2(g) ΔH ,相关物质的燃烧热数据如下表所示: ①ΔH 1=_________ kJ·mol ?1。 ②提高该反应平衡转化率的方法有 _________、_________。 ③容器中通入等物质的量的乙烷和氢气,在等压下(p )发生上述反应,乙烷的平衡转化率为α。反应的平衡常数K p =_________(用平衡分压代替平衡浓度计算,分压=总压×物质的量分数)。 (2)高温下,甲烷生成乙烷的反应如下:2CH 4??? →高温 C 2H 6+H 2。反应在初期阶段的速率方程为:r =k ×4CH c ,其中k 为反应速率常数。 ①设反应开始时的反应速率为r 1,甲烷的转化率为α时的反应速率为r 2,则r 2=_____ r 1。

2019年高考试题分类汇编:选考内容(文)

2019年高考试题分类汇编:选考内容 1.【2019高考陕西文15】(不等式选做题)若存在实数x 使|||1|3x a x -+-≤成立,则实数a 的取值范围是 . 【答案】42≤≤-a . 2.【2019高考陕西文15】(几何证明选做题)如图,在圆O 中,直径AB 与弦CD 垂直,垂足为E ,EF DB ⊥,垂足为F ,若6AB =,1AE =,则DF DB ?= . 【答案】5. 3.【2019高考陕西文15】(坐标系与参数方程)直线2cos 1ρθ=与圆2cos ρθ=相交的弦长为 .【答案】3. 4.【2019高考天津文科13】如图,已知AB 和AC 是圆的两条弦,过点B 作圆的切线与AC 的延长线相交于D .过点C 作BD 的平行线与圆交于点E ,与AB 相交于点 F ,3AF =,1FB =,3 2 EF = ,则线段CD 的长为 . 【答案】 3 4 5.【2019高考湖南文11】某制药企业为了对某种药用液体进行生物测定,需要优选培养温度,实验范围定为29℃~63℃.精确度要求±1℃.用分数法进行优选时,能保证找到最佳培养温度需要最少实验次数为_______.

【答案】7 【解析】用分数法计算知要最少实验次数为7. 【点评】本题考查优选法中的分数法,考查基本运算能力. 6.【2019高考湖南文10】在极坐标系中,曲线1C :sin )1ρθθ+=与曲线2C : a ρ=(0)a >的一个交点在极轴上,则a =_______. 7.【2019高考广东文14】(坐标系与参数方程选做题)在平面直角坐标系xOy 中,曲线1 C 和2C 的参数方程分别为x y θθ ?=??=??(θ为参数,02πθ≤≤ )和122 x y ?=-????=-??(t 为参 数),则曲线1C 和2C 的交点坐标为 . 【答案】(2,1) .8【2019高考广东文15】(几何证明选讲选做题)如图3所示,直线PB 与圆O 相切于点B , D 是弦AC 上的点,PBA DBA ∠=∠. 若AD m =,AC n =,则 AB = . 9.【2019高考辽宁文24】(本小题满分10分)选修4-5:不等式选讲 已知()|1|()f x ax a R =+∈,不等式()3f x ≤…的解集为{|2x -剎≤1x ≤…}。 (Ⅰ)求a 的值; (Ⅱ)若|()2()|2 x f x f k -≤…恒成立,求k 的取值范围。 【答案 】

2013-2017高考真题分类汇编集合

2017年高考数学文试题分类汇编—集合 【2017年北京卷第1题】已知U =R ,集合{|22}A x x x =<->或,则U A =e (A )(2,2)- (B )(,2)(2,)-∞-+∞ (C )[2,2]- (D )(,2][2,)-∞-+∞ 【2017年江苏卷第1题】已知集合{}=1,2A ,{}=+2,3B a a ,若 A B ={1}则实 数a 的值为________ 【2017年山东卷第1题】设集合{}11M x x =-<,{}2N x x =<,则M N = (A )()1,1- (B )()1,2- (C )()0,2 (D )()1,2 【2017年天津卷第1题】设集合{1,2,6},{2,4},{1,2,3,4}A B C ===,则()A B C = (A ){2}(B ){1,2,4}(C ){1,2,4,6}(D ){1,2,3,4,6} 【2017年浙江卷第1题】已知集合{}{}x -1,则( ) A .A B =3|2x x ??5}A x x B x x x =<<=<或,则A B = (A ){|2<<5}x x (B ){|<45}x x x >或 ( C ){|2<<3}x x ( D ){|<25}x x x >或 2、(2016年江苏省高考)已知集合{1,2,3,6},{|23},A B x x =-=-<<则=A B ________________.

2018年高考试题分类汇编_概率统计

概率统计 1(2017北京文)(本小题13分) 某大学艺术专业400名学生参加某次测评,根据男女学生人数比例,使用分层抽样的方法从中随机抽取了100名学生,记录他们的分数,将数据分成7组:[20,30),[30,40),┄,[80,90],并整理得到如下频率分布直方图: (Ⅰ)从总体的400名学生中随机抽取一人,估计其分数小于70的概率; (Ⅱ)已知样本中分数小于40的学生有5人,试估计总体中分数在区间[40,50)内的人数;(Ⅲ)已知样本中有一半男生的分数不小于70,且样本中分数不小于70的男女生人数相等.试估计总体中男生和女生人数的比例. 2(2017新课标Ⅱ理)(12分) 海水养殖场进行某水产品的新、旧网箱养殖方法的产量对比,收获时各随机抽取了100 个网箱,测量各箱水产品的产量(单位:kg).其频率分布直方图如下: (1)设两种养殖方法的箱产量相互独立,记A表示事件:“旧养殖法的箱产量低于50kg,新养殖法的箱产量不低于50kg”,估计A的概率;

(2)填写下面列联表,并根据列联表判断是否有99%的把握认为箱产量与养殖方法有关: (30.01). 附:, 22 ()()()()() n ad bc K a b c d a c b d -= ++++ 3(2017天津理)(本小题满分13分) 从甲地到乙地要经过3个十字路口,设各路口信号灯工作相互独立,且在各路口遇到红灯的概率分别为 111 ,,234 . (Ⅰ)设X 表示一辆车从甲地到乙地遇到红灯的个数,求随机变量X 的分布列和数学期望; (Ⅱ)若有2辆车独立地从甲地到乙地,求这2辆车共遇到1个红灯的概率. 4(2017新课标Ⅲ理数)(12分) 某超市计划按月订购一种酸奶,每天进货量相同,进货成本每瓶4元,售价每瓶6元,未售出的酸奶降价处理,以每瓶2元的价格当天全部处理完.根据往年销售经验,每天需求量与当天最高气温(单位:℃)有关.如果最高气温不低于25,需求量为500瓶;如果最高气温位于区间[20,25),需求量为300瓶;如果最高气温低于20,需求量为200瓶.为了确定六月份的订购计划,统计了前三年六月份各天的最高气温数据,得下面的频数分布表: 以最高气温位于各区间的频率代替最高气温位于该区间的概率。 (1)求六月份这种酸奶一天的需求量X (单位:瓶)的分布列;

历年高考试题分类汇编:名著阅读(2017-2019年)

历年高考试题分类汇编:名著阅读(2017-2019年) 【2019年高考】 一、【2019年高考江苏卷】下列有关名著的说明,不正确的两项是(5分)(选择两项且全答对得5分,选择两项只答对一项得2分,其余情况得0分) A.《三国演义》中,张飞在长板桥上睁圆环眼厉声大喝,吓退曹兵,然后迅速拆断桥梁,以阻追兵,可见张飞十分勇猛,又很有智谋。 B.《家》中,许倩如倡导女子剪发,带头剪掉自己的辫子,还以梅的遭遇来激发琴拒绝包办婚姻,鼓励琴做一个跟着时代走的新女性。 C.《狂人日记》中,狂人说将来的社会“容不得吃人的人”,最后喊出“救救孩子”,作者借此表达了对社会变革的强烈渴望。 D.《欧也妮?葛朗台》中,夏尔在父亲破产自杀后,不愿拖累心上人安奈特而写了分手信给她,这一良善之举让偷看信件的欧也妮发誓要永远爱他。 E.《老人与海》中,圣地亚哥经过生死搏斗最终将大马林鱼残骸拖回港口,有游客把它当成了鲨鱼骨,这一误会让小说结尾更意味深长。 【答案】AD 【解析】本题考查识记和理解名著的能力。解答本题,平时一定要熟读名著,识记其中的人物和情节。对于大纲要求的篇目,有时间时就要反复读,只有熟到一定的程度,类似题目才能应对自如。A项,“迅速拆断桥梁”“有智谋”错误。如果不拆断桥,曹军害怕其中有埋伏不敢进兵。现在拆断了桥,曹军会料定张飞心虚,必定前来追赶。故A项错误。D项,“这一良善之举让偷看信件的欧也妮发誓要永远爱他”表述错误。欧也妮发誓要永远爱夏尔的原因不止是这一点,还有信中夏尔表达的对欧也妮的好感和赞美。故D项错误。B、C、E项正确。故选AD。 二、【2019年高考江苏卷】简答题(10分) (1)《红楼梦》“寿怡红群芳开夜宴,死金丹独艳理亲丧”一回中,群芳行令,宝钗摇得牡丹签,上云“任是无情也动人”。请结合小说概括宝钗的“动人”之处。(6分) (2)《茶馆》第三幕,在得知来到茶馆的“老得不像样子了”的人是秦仲义时,王利发对他说:“正想去告诉您一声,这儿要大改良!”这里的“大改良”指的是什么?这句话表达了王利发什么样的情感?(4分) 【答案】(1)容貌妍丽,行止娴静;才能出众,处事得体;善解人意,关怀他人。 (2)“大改良”指的是茶馆将被小刘麻子、沈处长等霸占。这句话表达了王利发与茶馆及老友诀别时的悲愤。 【解析】(1)本题考查学生阅读名著的能力。文学名著阅读的考查,主要是考查课外阅读的积累,要求了解名著的故事情节和人物形象。本题考查宝钗的“动人”之处,实际上是考察宝钗的形象特点,这形象特点要结合宝钗的外在形象和内在性格来答,概括时要依托于人物的行动。 (2)本题考查学生阅读名著的能力。文学名著阅读的考查,主要是考查课外阅读的积累,要求了解名著的故事情节和人物形象。话剧《茶馆》截取了清朝末年、民国初年、抗战胜利后三个历史片段,将整个社会都浓缩到茶馆中,来展现三教九流的生死沉浮,折射整个社会的变迁。“大改良”指的是茶馆将被小刘麻子、沈处长等霸占。这句话表达了王利发与茶馆及老友诀别时的悲愤。

最新2021学年高考试题分类汇编:实验

高考试题分类汇编:实验 (全国卷1)Ⅰ.(6分)如图所示,两个质量各为m1和m2的小物块A和B,分别系在一条跨过定滑轮的软绳两端,已知m1>m2,现要利用此装置验证机械能守恒定律。 (1)若选定物块A从静止开始下落的过程中进 行测量,则需要测量的物理量有_________。 ①物块的质量m1、m2; ②物块A下落的距离及下落这段距离所用的时 间; ③物块B下落的距离及下落这段距离所用的时间; ④绳子的长度。 (2)为提高实验结果的准确程度,某小组同学对此实验提出以下建议: ①绳的质量要轻; ②在“轻质绳”的前提下,绳子越长越好; ③尽量保证物块只沿竖直方向运动,不要摇晃; ④两个物块的质量之差要尽可能小。 以上建议中确实对提高准确程度有作用的是_________。 (3)写出一条上面没有提到的对提高实验结果准确程度有益的建议:__________________________________________________________________ ____________。 答案:(1) ①②或①③;(2)①③;(3)例如:“对同一高度进行

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