2020年桂林市高考第二次调研考试试卷及其答案
2020届广西省桂林、崇左、贺州市高三(下)第二次联合调研物理试题(解析版)
变压器的输出电压减小；根据功率表达式
P U2 R
可知用电器消耗的功率减小，故 C 错误； D．当 f 减小时，输入电压和输出电压不变，输出功率不变，故变压器的输入功率不变，故 D 错误。 故选 B。 4.甲、乙两物体沿同一直线运动，运动过程的位移－时间图象如图所示，下列说法正确的是（ ）
故选 C。 5.如图所示，正方形导线框 abcd 和菱形 MNPQ 在同一水平面内，ab＝MN＝MP＝L，ab⊥NQ，N 位于 ab 的中点，菱形区域存在方向竖直向上的匀强磁场，使线框从图示位置沿 NQ 方向匀速穿过菱形区域，规定电 流逆时针为正，则线框中的电流 i 随位移 x 变化的图象可能是( )
A. 相遇时 A 的速度一定不为零 B. 两位同学抛球时对 A、B 做功一样多 C. 从抛出到相遇 A、B 动能的变化量不同 D. 从抛出到相遇 A、B 两篮球重力势能的变化量相同 【答案】AD 【解析】
ቤተ መጻሕፍቲ ባይዱ
【详解】A．A 分解为竖直向的匀减速直线运动与水平向的匀速直线运动，相遇时 A 达到最高点则其竖直向 的速度为零，水平向速度不变，合速度不为零，故 A 正确； B．两位同学抛球的初速度不同，根据动能定理可知，两位同学抛球时对 A、B 做功不一样多，故 B 错误； C．根据动能定理可知，从抛出到相遇 A、B 两个物体的重力做功相同，因此动能的变化量相同，故 C 错误； D．A、B 质量相等且上升高度相等，所以从抛出到相遇 A、B 两篮球重力势能的变化量相同，故 D 正确。 故选 AD。 7.如图甲所示，小物块 A 静止在足够长的木板 B 左端，若 A 与 B 间动摩擦因数为µ1＝0.6，木板 B 与地面 间的动摩擦因数为µ2＝0.2，假设各接触面间的最大静摩擦力等于滑动摩擦力。某时刻起 A 受到 F＝3t 的水 平向右的外力作用，测得 A 与 B 间摩擦力 f 随外力 F 的变化关系如图乙所示，则下列判断正确的是（ ）
2020届广西桂林、贺州、崇左三市高三第二次联合调研考试语文试卷(精品)
广西桂林、贺州、崇左三市高三第二次联合调研考试语文【注意事项】1．本试题共150分，考试时间150分钟。
2．答卷前，考生务必将自己的姓名和座号填写在答题卡上。
3．回答选择题时，选出每小题答案后，用2B铅笔把答题卡对应题目的答案标号涂黑。
回答非选择题时，用黑色笔将答案写在答题卡上。
写在本试卷上无效。
4．考试结束后，将本试卷和答题卡一并交回。
一、现代文阅读（35分）（一）论述类文本阅读（本题共3小题，9分）阅读下面的文字，完成1-3题文化自信不仅在于自己的决心有多大,声音有多高,历史有多久,还在于人家是否信服,有没有“他信”。
在当今时代,面对大发展大变革的世界格局,面对各种思想文化更加频繁的交流、交融、交锋,谁占据了文化发展的制高点,谁就能够更好地在激烈的国际竞争中掌握主动权。
近些年来,西方学术界逐渐认识到,人类中心主义是导致包括生态危机在内的全球性危机的罪魁祸首。
人类中心主义以人的利益为认识、实践的出发点和归宿,认为自然的价值在于其对人类的有用性,而没有给予自然足够的人文关怀。
生态思想家帕斯莫尔认为,基督教鼓励人们把自己当作自然的绝对主人,对人来说所有的存在物都是为他安排的。
这正是当今西方文化的死穴。
人类文明今天已走到由量变到质变的临界点,克服人类中心主义成为人类文明发展的当务之急。
英国历史学家汤因比指出：避免人类自杀之路,在这一点上现在各民族中具有最充分准备的,是两千年来培育了独特思维方法的中华民族。
什么是“独特思维方法”?就是以“中”为度、以“和”为贵。
《中庸》有云:“中者,天下之大本也；和者,天下之达道也。
”“中”“和”二字是中华文化的精髓所在。
在如何摆正人与自然关系方面,中华文化积累了丰富的中道智慧,是克服人类中心主义的一剂良方。
中华文化一方面注重人在天地之间的地位与作用,强调“惟人,万物之灵”；另一方面注重天地本身的价值,所谓“人法地,地法天,天法道,道法自然”,认为人必须遵从自然规律。
2020届广西省桂林、崇左、贺州市高三(下)第二次联合调研物理试题(解析版)
A. 星球 A 的周期比星球 B 的大
B. 星球 A 的向心加速度比星球 B 的小
C. 两星球的轨道半径 rA：rB＝3：1 【答案】D
D. 两星球的轨道速度大小 vA：vB＝9：1
【解析】
【详解】A．双星系统具有相同的角速度，所以星球 A 的周期与星球 B 的周期相等，故 A 错误；
B．根据万有引力提供向心力
D．根据
v r
可得两星球的轨道速度大小
故 D 周期。
vA：vB＝9：1
故选 D。 3.如图所示，理想变压器的原线圈接有频率为 f、电压为 U 的交流电，副线圈接有光敏电阻 R1、用电器 R2(纯 电阻)。下列说法正确的是
A. 当光照减弱时，变压器的输入功率增大 B. 当光照增强时，流过用电器 R2 的电流不变 C. 当滑动触头 P 向上滑动时，用电器消耗的功率增大 D. 当 f 减小时，变压器的输入功率减小 【答案】B 【解析】 【详解】A．当光照减弱时，光敏电阻的电阻值增大，故变压器的输出功率减小，所以输入功率也减小，故 A 错误； B．当光照增强时，变压器的匝数比不变，所以输出电压不变，则流过用电器 R2 的电流不变，故 B 正确； C．当滑动触头 P 向上滑动时，原线圈匝数增加，根据
G
mAmB L2
mAaA
mBaB
可得星球 A 的向心加速度与星球 B 的加速度之比为
aA : aB mB : mA 9 :1
故 B 错误；
C．双星靠相互间的万有引力提供向心力A 2
mBrB 2
可得两星球的轨道半径
故 C 错误；
rA：rB＝9：1
2020 年高考桂林崇左贺州市联合调研考试理科综合能力测试物理部分
一、选择题
1.下列说法正确的是（ ） A. 汤姆孙通过研究阴极射线发现了电子，并提出了原子的“枣糕模型” B. 光电效应中光电子的最大初动能与入射光的频率成正比 C. 一群氢原子在第四能级最多能向外辐射四种不同频率的光子 D. 太阳辐射的能量主要来自太阳内部的链式反应 【答案】A 【解析】 【详解】A．汤姆孙通过研究阴极射线发现了电子，并提出了原子的“枣糕模型”，故 A 符合题意； B．根据爱因斯坦光电效应方程
2020届桂林中学高三英语第二次联考试卷及参考答案
2020届桂林中学高三英语第二次联考试卷及参考答案第一部分阅读（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A、B、C、D四个选项中选出最佳选项ASome colleges have started offering their own gap year programs to support students who want to take a year off in a meaningful way. Below, we’ll look at four of these programs.American University Gap ProgramWhen to apply: By July 15 or November 15Is there funding available? No.In American University Gap Program, students spend three days per week with a government or business organization in the city. Students go on field trips, listen to guest speakers, take part in hands-on lessons and work on service projects as a group. Students who complete the program can earn seven credits.Duke University Gap Year ProgramWhen to apply: By early May of each yearIs there funding available? Yes, $5,000 to $15,000.Though Duke University has no course of study or experience for its gap year program, it encourages students to have an independent plan for their year off, particularly one that promotes personal growth. Independent experiences may include community service, personalized experiential learning opportunities and others.Florida State University Gap YearWhen to apply: By February 24Is there funding available? Yes, up to $5,000.Florida State University offers gap year funding to students wishing to work or volunteer before starting college. In order to get the momey, students must explain their plans for their gap year. The experience must last over one year.St Norbert College Bridge Year ExperienceWhen to apply: not specifiedIs there funding available? Not specified.Students taking part in the Bridge Year Experience can travel to locations such as New Mexico, Wisconsin and Guatemala during the fall term, where they learn about the local cultures, take courses and get serviceopportunities.1.What does Duke University advise students to do during their gap year?A.Focus on their personal growth.B.Be independent of their parents.C.Apply before the end of November.D.Contact some off-campus organization.2.How can students get gap year funding from Florida State University?A.By having extra credits.B.By organizing several projects.C.By showing their gap plans.D.By doing volunteer work.3.If you are interested in travelling, you can choose ________.A.Florida State University Gap YearB.American University Gap ProgramC.Duke University Gap Year ProgramD.St. Norbert College Bridge Year ExperienceBWhen I was young, my mother didn't have the money to send me to school, but she thought it was important for me to keep up with education.So she decided to teach me extra lessons herself.But because she had to go to work, the only time she could do it was at 4：30 inthe morning.We needevery one of you to develop your talents and your skills so that you can help us old folks solve our most difficult problems. If you quit on school—you're not just quitting on yourself, but you're quitting on your country. No one's written your destiny(命运)for you, because you write your own destiny. You make your own future.That's why today I'm calling on each of you to set your own goals for your education and do everything you can to meet them.Your goal can be something as simple as doing all your homework, paying attention in class, or spending some time reading a book.But whatever you decide to do, I want you to commit to it.I want you to really work at it.I know that sometimes you get that sense from TV that you can be rich and successful without any hard work—that your ticket to success is through rapping or basketball or being a reality TV star.No one's born being good at all things. You become good at things through hard work.You're not a good athlete the first time you play a new sport.You don't hit every note the first time you sing a song.You've got to practise.4. What can we learn from the first paragraph？A. The writer's home was very rich.B. The writer's mother was a teacher.C. The writer was born in a poor family.D. The writer didn't like reading books.5. What does the writer want everyone to do by improving their talents and skills？A. To quit on their country to earn more money.B. To help solve the most difficult problems.C. To write their own new destiny by working as a TV star.D. To spend some time writing books about their own life.6. Why does the writer call on everyone to set his/her own goal？A. Because everyone's future is determined by themselves.B. Because eyeryone's future is to do simple work.C. Because everyone should do their homework.D. Because everyone should pay attention in class.7. How can people realise their great dreams？A. By rapping.B. By playing basketball.C. By being a reality star.D. By working hard.CChildren's average daily time spent watching television or using mobile device increased from 53 minutes at age 12 months to more than 150 minutes at 3 years, according toan analysis by researchers at the National Institutes of Health (NIH). By age 8, children were more likely to log the highest amount of screen time if they had been in home-based children or were born to first-time mothers.“Our results indicate that screen habits begin early, ”said Edwina Yeung, an investigator in National Institute of Child Health and Human Development (NICHD).“This finding suggests that interventions(干涉) to reduce screen time could have a better chance of success if introduced early.”In the research, mothers of 4, 000 children responded to questions on their kids' media habits when they were 12, 18, 24, 30, and 36 months of age.TheAmericanAcademyof Pediatrics recommends avoiding digital media exposure for children under 18 months of age, introducing children 18 to 24 months of age to screen media slowly, and limiting screen time to an hour a day for children from 2 to 5 years of age. In the current study, researchers found that 87% of the childrenhad screen time exceeding (超过) these recommendations. However, while screen time increased throughout toddlerhood, by age 7 and 8, screen time fell to under 1.5 hours per day. The researchers believe this decrease relates to time consumed by school-related activities.The study authors classified the children into two groups based on how much their average daily screen time increased from age 1 to age 3. The first group, 73% of the total had the lowest increase, from an average of nearly 51 minutes a day to nearly an hour and 47 minutes a day. The second group, 27% of the total, had the highest increase, from nearly 37 minutes of screen time a day to about 4 hours a day. Higher levels of parental education were associated with lower odds of inclusion in the second group.8. Who use mobile device longest according to the NIH's analysis?A. 10-year-old born to first-time mothers.B. 3-year-old children in low income families.C. 8-year-old children in home-based childcare.D. 1-year-old children with parents poorly educated.9. What does the research suggest according to Edwina?A. Parents should stop their children using media.B. Parents should limit the use of digital media themselves.C. Parents should reduce their children's screen time earlier.D. Parents should avoid their children using digital media at infancy (婴儿期).10. Why does children's screen time fall when they age 7 and 8?A. They are studying at school.B. They can control themselves.C. They are tired of using them.D. They are forbidden to use them.11. Which of the following may be the best title?A. Keep Away from MediaB. Screen Habits Begin EarlyC. Urgency of Parental EducationD. Harm of Home-based ChildcareDA new study finds almost one third of the world’s population is overweight. Since 1980, obesity rates(肥胖率)in children and adults have doubled in 73 countries, making people more worried. And rates are increasing in many other countries. Obesity is increasing faster in children than adults in many nations, including Algeria, Turkey and Jordan, the report said. But the world's weight problem is growing in both rich and poor countries alike. Researchers say an increasing number of people are dying of related health problems in what they called a"disturbing global public health problem."Researchers studied health information from 1980 through 2015. They examined obesity rates, average weight gain in 195 countries. They found that obesity rates are three times greater among youth and young adults in countries like China, Brazil and India. Almost 108 million children and more than 600 million adults were found to be overweight. Egypt had the highest number of overweight adults in 2015. Vietnam had the least. In the same year, the United States had the highest number of overweight children, and Bangladesh had the least.Yet hunger remains a problem in many areas. The United Nations said that almost 800 million people, including 300 million children, go to bed hungry each night. Experts said poor diets and lack of physical activity are mainly to blame for the rising numbers of overweight people.Growing populations have led to rising obesity rates in poor countries. Often, poor people will eat processed(加工的) foods instead of choosing a diet rich in vegetables.The London-based Overseas Development Institute studied the price of food in five countries: Britain, Brazil, China, Mexico and South Korea. It found that the cost of processed foods like ice creamand hamburgers has fallen since 1990. But the cost of fresh fruits and vegetables has gone up.12. What do we know about obesity in the world?A. It is worryingB. It is given no attentionC. It has been successfully solvedD. It is more serious among old people13. Which country has the most overweight children in 2015?A. AmericaB. VietnamC. EgyptD. Bangladesh14. What is one of the reasons why people get overweight?A. HungerB. Poor dietC. Diets with vegetablesD. Eating too much fruit15. Which ofthe following can be the best title for the text?A. It’s Important to Have a Balanced DietB. How Can We Lose Weight and Keep Fit?C. Is It Necessary for Us to Eat Fresh Vegetables?D. Nearly One Third of People in the World Are Overweight.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。
广西桂林崇左贺州市2020届高三(5月)下学期第二次联合调研考试 英语 试题(含答案)
绝密★启用前2020年高考桂林崇左贺州市联合调研考试英语(考试时间120分钟，满分150分)注意事项：1.本试卷分第I卷(选择题)和第II卷(非选择题)两部分。
2.答卷前，考生务必用黑色字迹的钢笔或签字笔将自己的姓名和考生号、试室号、座位号填写在答题卡上，并用2B铅笔在答题卡上的相应位置填涂考生号。
3.选择题每小题选出答案后，用2B铅笔把答题卡上对应题目选项的答案信息点涂黑，如需改动，用橡皮擦干净后，再选涂其他答案，答案不能答在试卷上。
4.非选择题必须用黑色字迹钢笔或签字笔作答，答案必须写在答题卡各题目指定区域内相应位置上；如需改动，先划掉原来的答案，然后再写上新的答案；不准使用铅笔和涂改液。
不按以上要求作答的答案无效。
第一部分听力(共两节，满分30分)做题时，先将答案标在试卷上。
录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到答题卡上。
第一节(共5小题；每小题1.5分，满分7.5分)听下面5段对话。
每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项。
听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。
每段对话仅读一遍。
1. Who will probably hold a party?A. The woman's friend.B. The man.C. The man's friend.2. What was the weather like in Australia then?A. Rainy.B. Nice.C. Terrible.3. Where will the woman go first?A. To a beach.B. To a hank.C. To a ladies' room.4. What does the woman mean?A. The man forgets to do his hair.B. The man forgets to put on a tie.C. The man is wearing clothes that don’t match.5. Why does the woman dislike the film?A. It was boring.B. It was violent.C. It was badly-written.第二节(共15小题；每小题1.5分，满分22.5分)听下面5段对话或独白。
广西桂林、崇左、贺州2020届高三第二次联合考试语文试题含答案
2020年高考桂林、崇左、贺州联合调研考试语文第I卷(阅读题)一、现代文阅读(36分)(一)论述类文本阅读(本题共3小题，9分)阅读下面的文字，完成1-3题。
明清小说命名方法呈现多元化的特征，站在我们今天的角度来看，其命名对我们当今的文学尤其是小说创作、出版、传播具有一定的启示意义。
首先，小说命名体现鲜明的中国特色和中国元素。
不少明清小说以“忠”“忠烈”“孝”“喻世”“警世”“醒世”等字词加入小说书名，藉以宣扬儒家伦理道德规范，强化小说社会功用，《红楼梦》第四十二回提到，凤姐之女因是农历七月七日所生，所以刘姥姥为她取名“巧姐”，反映出小说创作与民间风俗文化的关系密切；《水浒传》《红楼梦》等小说中反映了不少民间寄名、绰号等风俗习惯，这些均体现着鲜明的中国特色和中国元素，为我们当今的小说创作、出版、传播提供了借鉴意义。
党的十九大报告指出：“推动中华优秀传统文化创造性转化、创新性发展”“不忘本来、吸收外来、面向未来，更好构筑中国精神、中国价值、中国力量，为人民提供精神指引”。
中国传统文化博大精深，应该成为我们当代包括小说在内的文学创作与传播取之不尽、用之不竭的源泉。
其次，小说命名关注现实，具有鲜明的时代特色。
小说创作与当时的社会背景和时代风气之间有着密不可分的关系，这从小说命名方面可以得到一定的印证。
明末奸臣当道，党争激烈，面临着内忧外患。
在这种特定的历史形势下，实学思潮十分兴盛，提倡经世致用、崇黜虚。
这在明清小说命名中有着集中体现，《魏忠贤小说斥奸书》《皇明中兴圣烈传》《警世阴阳梦》等明末时事小说将“斥奸”“烈”“警世”等字词嵌入小说书名，体现出歌颂忠臣、贬斥奸佞的创作意图。
近代中国内忧外患，文人志士积极入世，关注国家命运，因而在小说书名上普遍运用“痛”“恨”“耻”“仇”等字眼，表达对国家、民族的担忧，对外敌入侵以及对腐败无能的清政府的仇恨，如《恨海》《痛史》《仇史》等。
同时，近代小说多以“新”命名，反映当时人们渴求变革的心理，如《新纪元》《新三国志》《新水浒》《新西游》《新中国未来记》等。
广西桂林、崇左、贺州市2020届高三下学期第二次联合调研考试 地理 Word版含答案
绝密★启用前2020年高考桂林崇左贺州市联合调研考试文科综合地理部分注意事项：1.本试卷分第I卷(选择题)和第II卷(非选择题)两部分，共12页。
2.答题前，考生务必在答题卡上用直径0.5毫米的黑色字迹签字笔将自己的姓名、准考证号填写清楚，并贴好条形码。
请认真核准条形码上的准考证号、姓名和科目。
3.答第I卷时，选出每小题答案后，用2B铅笔把答题卡上对应题目的答案标号涂黑。
如需改动，用橡皮擦干净后，再选涂其他答案标号。
答在本试卷上无效。
4.答第II卷时，请用直径0.5毫米的黑色字迹签字笔在答题卡上各题的答题区域内做答。
答在本试卷上无效。
5.第43、44题为地理选考题，第45、46、47题为历史选考题，请按题目要求从每科中分别任选一题做答，并用2B铅笔在答题卡上把所选题目题号后的方框涂黑。
6.考试结束后，将本试卷和答题卡一并交回。
第I卷(选择题共140分)桂林市某县雪梨是中国农产品地理标志产品。
该县通过成立水果产销专业合作社，实施雪梨套袋(果农把幼果装入特制纸袋中，如图1)、科学采摘、统一包装、统一标识等措施后，雪梨不仅深受国内消费者青睐，还远销加拿大、东南亚一带。
据此完成1～3题。
1.雪梨套袋最主要的目的是A.防止低温冻害B.防止感染病虫害C.减少果皮外伤D.提高雪梨产量2.该县雪梨采用统一包装、统一标识的目的是A.享受政府补贴B.降低生产成本C.节省包装时间D.扩大品牌影响3.该县雪梨远销加拿大、东南亚等地的主要原因是A.海运运费低B.雪梨产量大C.雪梨品质好D.国内需求小受季节性海平面、入海径流流量和河床高度等因素影响，令海水倒灌，咸淡水混合造成上游河道水体变咸，即形成咸潮(又称咸潮上溯、盐水入侵)。
读钱塘江口咸潮入侵次数年变化(2009-2018年)月份分布图，据此回答4～6题。
4.图中12月至次年3月咸潮入侵次数较少的原因可能是①季节性海平面较低②降水较少③河流流量较大④河道淤积A.①②B.①④C.②③D.③④5.图中8-11月咸潮入侵次数较多，其中2013年8-10月共发生了两次较严重的咸潮入侵，原因可能是①季节性海平面较高②台风侵袭③天文大潮的影响④河道变宽A.①②③B.①②④C.①③④D.②③④6.严重的咸潮入侵对钱塘江口附近地区的生产活动影响最大的是A.河道运输B.水厂取水C.工厂排水D.农田灌溉耶罗岛又名“费罗岛”，是火山岛，属加那利群岛。
2020年桂林中学高三英语第二次联考试卷及答案解析
2020年桂林中学高三英语第二次联考试卷及答案解析第一部分阅读（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A、B、C、D四个选项中选出最佳选项AAQUILA Children’s Magazine is the most intelligent read for curious kids. Full of enthusiastic articles and challenging puzzles, every issue covers science, history and general knowledge. AQUILA is a quality production, beautifully illustrated with contemporary artwork throughout.● Intelligent reading for 8-12 year-olds● Cool science and challenging projects● Inspires self-motivated learning● Exciting new topic every issueAQUILA is created and owned by an independent UK company. It has 28 pages,printed on high-quality paper and there are no advertisements or posters. Instead it is full of well-written articles, thought-provoking ideas and great contemporary artwork. Each monthly issue is centred around a new topic.AQUILA works as a superb learning extension to current primary (or KS2 and KS3) curriculum (课程), but it is much more than that! Entertaining and always surprising, AQUILA is recommended because it widens children’s interest and understanding, rather than encouraging them to concentrate only on their favourite subjects. It gives children a well-rounded understanding of the world, in all its complexity.The concepts in AQUILA can be challenging, requiring good comprehension and reading skills. 8 years is usually a good age to start. Some gentle interest from an adult is often helpful at the start.In 2020 AQUILA will have been in publication for 28 years, but it has never appeared in newsstands or shops. We are subscription only.AQUILA SubscriptionUK: 12 Months £55 - 4 Months £30Europe: 12 Months £60 -4 Months £35World: 12 Months £70 - 4 Months £35BirthdaysSelect the Birthday option, write a gift message and choose the birthday month. We will dispatch to arrive at the start of the month you have entered. The package posts in a blue envelope marked ‘Open on your birthday’.1.What is special about AQUILA?A.It is available in shops.B.It is for kids of all ages.C.It has no advertisements.D.It prints readers’ artworks.2.What does AQUILA offer its readers?A.Articles on modern art.B.Family reading materials.C.Ideas on improving readingskills.D.Knowledge beyond school subjects.3.AQUILA is intended for ________.A.foreign language learnersB.children with learning difficultiesC.parent-child reading loversD.curious kids with good comprehensionBJapan is known to have higher than average rates of stomach cancer. Recently, the town of Kaneyama in Yamagata Prefecture decided to get its 6, 000 residents (居民) tested.However, the frozen urine samples (尿样) are not tested in conventional ways. Instead, Professor Masao Miyashita and his team are using them in a trial to determine if specially trained cancer-sniffing dogs can accurately detect the disease. Though the study is still in its early stages, Miyashita is thrilled with the results. He said, “In our research so far, cancer detection dogs have been able to find signs of cancer with an accuracy of nearly 100 percent.”Researchers have known about the animals’ superior sensory skills for decades. However, their ability to detect cancer in humans came to light in 1989, after a dog sniffed out early-stage malignant melanoma (恶性黑色素瘤) on a patient’s leg in London. Since then, scientists from many countries have conducted studies to test dogs’ great skill at identifying cancer chemicals.While most dogs can be trained for the task researchers say the best candidates are dogs that are precise, quiet, and perhaps even a little shy. The training process is similar to how dogs are taught to learn any trick — by rewarding them with treats! However, it takes much longer because the dogs have to learn to separate the “cancer scent (气味)”from the thousands of organic compounds (有机化合物) in the human body. Researchers begin by exposing the dogs to urine samples from people with cancer, people with other diseases, and patients with nohealth issues, Once the dogs are able to accurately identify cancer, they are further trained to detect particular kinds of cancer.Successful as they may be, experts think dogs are unlikely to replace conventional tests. For one, it takes about seven years and costs as much as $45,000 to train a single dog. Klaus Hackner, a researcher and physician who studies dogs detecting cancer in breath samples at Krems University Hospital in Austria, is also not convinced dogs can be relied upon alone. Patients, therefore, have to receive further tests to confirm if they have the disease.4. What do we know about the cancer-sniffing dogs mentioned in Paragraph 2?A. They have done a great job.B. They are trained in a special way.C. They can easily learn to distinguish cancer.D. They can be seen in many Japanese hospitals.5. What does the author intend to do in Paragraph 3?A. Offer readers some advice.B. Add some background information.C. Summarize the previous paragraphs.D. Introduce a new topic for discussion.6. What kind of dog is suitable for the cancer-sniffing job?A. Smart and brave.B. Active and faithful.C. Strong and patient.D. Careful and peaceful.7. What is Klaus Hackner’s opinion on cancer-sniffing dogs?A. They should work as a team.B. They need to receive more training.C. They can replace doctors in detecting cancer.D. They should be used together with traditional tests.CSomeday soon an emoji (表情符号)might really save lives.Hiroyuki Komatsu is a Google engineer who suggested adding a series of new emojis to the standard emoji library. It could help those with food allergies (过敏)understand what they are eating anywhere inthe world. Emojis should cover characters representing major food causing allergies. They make people understand what areused in foods even in foreign countries and safely select meals.Emojis are universal because they are chosen and developed by the Unicode Consortium, a non-profit company that oversees, develops and maintains how text is represented. This is in regards to all software products and standards. It's thanks to the Unicode Standard that when you text a friend six pizza emojis, they’ll see those six pizza pieces on their phone. This is true regardless of whether they use an iPhone or an Android.Because emojis are everywhere and visual(视觉的),they could be helpful for restaurants and food packaging designers. They can communicate whether a product is made with common causing-allergy food. But as Komatsu’s advice argues, many of the most common causing-allergy foods are missing or poorly represented by the present emoji library. For example, there is an emoji for octopus, but nothing for squid. There is a loaf of bread that could symbolize grain, but a picture of wheat could be clearer. The emojis can be more direct when symbolizing foods.It’s not uncommon for the Unicode Consortium to add new emojis to the library: several food-related emojis were put into use last June, including some long-waited food emojis. Apple included support for multiracial emojis in a recent iOS update. An artist even recreated Moby-Dick in emoji characters. Some might be sorry for the continuing death of the written word if Komatsu’s suggestion is accepted, but look on the bright side: if you ever see that happy poop on a box, you’ll know to stay away.8. How will emojis save lives according to the text?A. By showing what the food contains visually.B. By telling the safest places in the world.C. By teaching people how to treat allergies.D. By adding standard emojis about safety.9. What does paragraph 3 mainly tell us?A. Emojis have the same meanings around the world.B. The Unicode Consortium is a non-profit company.C. What emojis represent is different in different places.D. Different mobile operating systems have different emojis.10. What can be the reason for Komatsu’s advice?A. Emojis are easy to mix up.B. Present emojis are not enough.C. Emojis can't interest most users.D. Emojis can't represent foods directly.11. What is the author’s attitude to Komatsu's suggestion?A. Doubtful.B. Worried.C. Supportive.D. Uninterested.DWatching what you eat can be easier said than done, but a recent study shows it might not just be about what's on your plate — it could be about how quickly it disappears.Japanese researchers followed 1,083 adultsfor five years, splitting them into three categories based on how quickly they ate: slow, normal, and fast. They also answered a questionnaire at the beginning of the study, sharing their diet, physical activity, and medical history. In the beginning, none of the volunteers had metabolic syndrome (新陈代谢综合征) - meaning at least three risk factors — which can lead to health problems like heart conditions and diabetes.When the participants reported back five years later 84 had been diagnosed (诊断) with metabolic syndrome — and their eating speed was a major predictor, according to the results in the journal Circulation. The fast eaters were 89 percent more likely to have metabolic syndrome than slow and normal eaters. Just 2.3 percent of slow eaters received the diagnosis, compared to 11.6 percent of fast eaters. But that's not all. Fast eaters also saw more weight gain, larger waistlines, and higher blood sugar levels than slow eaters.The researchers saygobblingmakes it easier not to take notice of fullness before your body has a chance to signal you to stop. “So when people eat fast they are more likely to overeat,” said Takayuki Yamaji, MD, study author and cardiologist at Hiroshima University in Japan in a statement.Previous research backs up the weight benefits of slow eating, too. One study of New Zealand women found fast eaters have higher body-mass indexes (指数), and a Chinese study found that both healthy and fat men ate less when told to chew 40 times instead of 15 times before swallowing. Initial research even suggests chewing your food longer could bum more calories - up to about 1,000 extra every month.12. What are the participants divided by?A. Medical history.B. Health condition.C. Physical activity.D. Eating speed.13. Which may be the result of the study?A. Fast eaters are 4 times more likely to have metabolic syndrome.B. Normal and slow eaters don’t have metabolic illness.C. 89% of fast eaters have higher blood pressure.D. Slow caters are healthier than fast eaters.14. What does the underlined word “gobbling” in Paragraph 4 best mean?A. Tasting slowly.B. Digesting quickly.C. Eating greedily.D. Cooking carefully.15. What does the last paragraph tell us?A. The importance of eating speed.B. The advantage of eating slowly.C. The result of a Chinese study.D. Fast eating and overeating.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。
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_______．
16．某校13 名学生参加军事冬令营活动，活动期间各自扮演一名角色进行分组游戏，角色按级别从小到大
共 9 种，分别为士兵、排长、连长、营长、团长、旅长、师长、军长和司令。游戏分组有两种方式，
可以 2 人一组或者 3 人一组。如果 2 人一组，则必须角色相同；如果 3 人一组，则 3 人角色相同或者 3 人
为级别连续的 3 个不同角色。已知这13 名学生扮演的角色有 3 名士兵和 3 名司令，其余角色各1 人，现
在新加入1 名学生，将这14 名学生分成 5 组进行游戏，则新加入的学生可以扮演的角色的种数为
_______．
第2页,共11页
三、解答题：共 70 分，解答应写出文字说明、证明过程或演算步骤.第 17~21 题为必考题，每个试题考生
第1页,共11页
A． 5
B． 6
C． 7
D． 8
9．设 m ln 2 ， n lg 2 ，则
A． m n mn m n
B． m n m n mn
C． m n mn m n
D． m n m n mn
10．过抛物线 C : y2 4x 的焦点 F ，且斜率为 3 的直线交 C 于点 M （在 x
C．
7 9
D．
7 18
5．设平面 与平面 相交于直线 m ，直线 a 在平面 内，直线 b 在平面 内，且 b m ，则“ ”是“ a b ”
的
A．充分不必要条件
B．必要不充分条件
C．充分必要条件
D．既不充分也不必要条件
6．函数
f
(x)
sin
2x
3
0
x
5 12
的值域为
A．
第Ⅰ卷（选择题
一、选择题：本题共 12 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．
i
是虚数单位，复数
1
i
i
在复平面上对应的点位于
A．第一象限
B．第二象限
C．第三象限
D．第四象限
2．等差数列 {an} 中，已知 a1 a9 10 ，则 a3 a4 a5 a6 a7
人进行问卷调查.已知高一被抽取的人数为 36 人，那么高三被抽取的人数为_______人．
15．点 P 在双曲线
x2 a2
y2 b2
1(a
0,b 0)
的右支上，其左、右焦点分别为 F1 、 F2 ，直线 PF1 与以坐标原点
O 为圆心、 a 为半径的圆相切于点 A ，线段 PF1 的垂直平分线恰好过点 F2 ，则该双曲线的离心率为
轴上方），l 为 C 的准线，点 N 在 l 上且 MN l ，则点 M 到直线 NF 的 距离为
A． 2 3
B． 3 3
C． 5
D． 2 2
11．已知函数 f (x) ln x ,若 0 a b ,且 f (a) f (b) ,则 2a b 的取值范围是
A． (2 2, )
B．[2 2, )
1 2
,1
B．
0,
1 2
C． 0,1
D．
1 2
,
0
7．在区间 1,1 上随机取一个实数 k ，使直线 y k (x 3) 与圆 x2 y2 1相交的概率为
A．
1 2
B．
1 4
C． 2 2
D． 2 4
8．很多关于整数规律的猜想都通俗易懂，吸引了大量的数学家和数学爱好者，有些猜想已经被数学家证
2020 年桂林市高考第二次调研考试
文科数学
注意事项：
1．答题前，考生先将自己的姓名、准考证号码填写清楚，将条形码准确粘贴在条形码区域内. 2．选择题必须使用 2B 铅笔填涂；非选择题必须使用 0.5 毫米黑色字迹的签字笔书写，字体工整、笔迹清楚. 3．请按照题号顺序在答题卡各题目的答题区域内作答，超出答题区域书写的答案无效；在草稿纸、试卷上答题无效. 4．作图可先使用铅笔画出，确定后必须用黑色字迹的签字笔描黑. 5．保持卡面清洁，不要折叠、不要弄破、弄皱，不准使用涂改液、修正带、刮纸刀.
A． 5
B．10
3．已知集合 A x x 1 ， B x ex 1 ，则
C．15
D． 25
A． A B x x 1
B． A B x x e
C． A (ðR B) R
D． ðR B A x 0 x 1
4．已知
满足
sin
1 3
，则
cos 2
A．
7 9
B．
7 18
B. 4712
C. 4713
D. 4715
第Ⅱ卷（非选择题 共 90 分）
二、填空题：本题共 4 小题，每小题 5 分，共 20 分.
13．已知向量 a 2, 6 ， b 3, m ，若 a b a b ，则 m _______．
14．某校为了解学生学习的情况，采用分层抽样的方法从高一 2400 人、高二 2000 人、高三 n 人中，抽取 90
y
关于开关旋钮旋转的
弧度数 x 的回归方程类型?(不必说明理由) （2）根据判断结果和表中数据，建立 y 关于 x 的回归方程；
明，如“费马大定理”，但大多猜想还未被证明，如“哥德巴赫猜想”、“角谷猜想”.“角谷猜想”的内容是：
对于每一个正整数，如果它是奇数，则将它乘以 3 再加1 ；如果它是偶数，则对它除以 2 ；如此循环，
最终都能够得到1 。下图为研究“角谷猜想”的一个程序框图.若输入 n 的值为10 ，则输出 i 的值为
C． (3, )
D． [3, )
12．在一个数列中，如果 n N* ，都有 anan1an2 k ( k 为常数)，那么这个数列叫做等积数列， k 叫做这
个数列的公积．已知数列{an} 是等积数列，且 a1 1 ， a2 2 ，公积为 8 ，则 a1 a2 a2000
A. 4711
x
y
10 xi xHale Waihona Puke 210 wi w210
xi x yi y
10
wi w yi y
i 1
i 1
i 1
i 1
1.47 20.6 0.78
2.35
0.81
－19.3
16.2
表中 wi
1 xi2
，
w
1 10
10
wi
i 1
．
（1）根据散点图判断，y
a
bx
与
y
c
d x2
哪一个更适宜作烧开一壶水时间
都必须作答.第 22、23 题为选考题，考生根据要求作答. （一）必考题：共 60 分 17．（本小题满分 12 分）
某学生为了研究煤气灶烧水如何节省煤气的问题设计了一个实验，并获得了煤气开关旋钮旋转的弧度 数 x 与烧开一壶水所用时间 y 的一组数据，且作了一定的数据处理(如下表)，得到了散点图(如下图)．