2020届广东省茂名市五校联盟2017级高三第二次联考理科综合试卷及答案

2017年茂名市高三级第二次综合测试理科综合化学试卷7．化学与生活密切相关，下列说法错误的是A．人工分子筛（多孔硅铝酸盐）可以用作吸附剂和催化剂B．硅胶可以用作食品、药品的干燥剂C．利用风能、太阳能等能源代替化石燃料，有利于节约能源保护环境D．蚕丝、腈纶和涤纶既属于化学纤维又属于高分子化合物8．下列实验，对应的现象以及结论都正确且两者具有因果关系的是9．设N A为阿伏加德罗常数值，下列有关叙述正确的是A.常温下，5.6g金属铁投入足量的浓硫酸中，电子转移数为0.3N AB. 18g D2O所含的中子数为10N AC．标准状况下，8 gSO3所含原子数为0.4N AD．常温下，1.0LpH=13的Ba (OH) 2溶液中含有的OH-数目为0.2N A10.短周期元素X、Y、Z、W的原子序数依次递增，其原子的最外层电子数之和为15。

X与Y、Z、W位于相邻周期，Z最外层电子数与周期数相等，W的一种氧化物是主要的大气污染物。

下列叙述正确的是A．原子半径的大小顺序：r (W) > r (Z) > r (Y) > r (X)B．最高价氧化物对应的水化物的碱性：Y > ZC. X、W的简单气态氢化物都易溶于水D. Z的最高价氧化物对应的水化物一定能溶于X的最高价氧化物对应的水化物11．下述实验能到达预期目的的是12．乙醇、正戊烷、苯是常见有机物，下列说法正确的是A．苯和溴水共热生成溴苯B.2，2-二甲基丙烷是正戊烷的同系物C．乙醇、正戊烷、苯均可通过石油的分馏得到D.乙醇、正戊烷、苯均能发生取代反应和氧化反应13．连二次硝酸(H2N2O2)是一种二元酸。

常温下，向10mL 0.01mol · L-1的H2N2O2溶液滴加0.01mol/L的NaOH溶液，测得H2N2O2溶液pH与NaOH溶液体积的关系如图所示。

下列说法正确的是A.由a点到n点水的电离程度依次增大B. a点时，c (H2N2O2) > c (Na+)C. m 点时，c(OH -)+c(N 2O 22-)=c(H 2N 2O 2) + c (H +)D. m 点到n 点，)()O HN ()(22222---⋅OH c c O N c 比值增大非选择题26、（14分）某学习小组利用以下装置进行电解氯化铵溶液的实验，其中X 为铁，Y 为石墨，a 为wg 质量分数为40%的NH4Cl 溶液（滴有酚酞）。

2020届广东省七校联合体2017级高三第二次联考理科综合试卷★祝考试顺利★(含答案)注意事项：1．答卷前,考生务必将自己的姓名、准考证号填写在答题卡上。

2．回答选择题时,选出每小题答案后,用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,再选涂其它答案标号。

回答非选择题时,将答案写在答题卡上,写在本试卷上无效。

3．考试结束后,将本试卷和答题卡一并交回。

可能用到的相对原子质量：H－1 C－12 O－16 Ca－40 Ti－48 Cu－64第I卷（选择题共126分）一、选择题：本大题共13小题,每小题6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．下列有关细胞代谢的叙述中,错误的是（）A无论有氧呼吸还是无氧呼吸,释放的能量大部分都是以热能的形式散失B人体细胞中的CO一定在细胞器中产生2C酶制剂适于在低温下保存,且不是所有的酶都在核糖体上合成D酶能降低化学反应的活化能,因此具有高效性2．HIV能通过细胞表面的CD4（一种受体蛋白）识别T细胞,如果给AIDS患者大量注射用CD4修饰过的红细胞,红细胞也会被HIV识别、入侵。

因HIV在红细胞内无法增殖,红细胞成为HIV的“陷阱细胞”,这为治疗AIDS提供了新的思路。

下列相关叙述正确的是（）A吡罗红能使HIV的遗传物质呈现红色B入侵到成熟红细胞内的HIV会利用其核糖体合成蛋白质C由于成熟红细胞内没有线粒体,HIV缺少能量而无法增殖D蛋白CD4是成熟红细胞合成的一种抗体,与双缩脲试剂反应呈紫色3．如图甲、乙、丙是某高等动物体内发生的细胞分裂模式图,图丁为某一时刻部分染色体行为的示意图,在无基因突变的情况下,下列说法正确的是（）A若丁发生在丙细胞形成的过程中,最终产生的子细胞基因组成有2种或4种B若A基因在图甲中的1号染色体上,则a基因在4号和8号染色体上C由于同源染色体分离,非同源染色体自由组合,乙细胞可分裂产生两种子细胞D若丁图表示发生在减数第一次分裂的四分体时期,则①和②都发生了染色体变异4．关于生物实验中“对照”及“变量”的相关叙述错误的是（）A质壁分离与复原实验中,滴加蔗糖属于自变量,滴加清水属于无关变量,原生质层位置变化为因变量B探究生长素类似物对扦插枝条生根的最适浓度实验中,生长素类似物浓度为自变量,生长素类似物种类和处理方法应相同,为无关变量C探究酵母菌呼吸方式实验中,两组装置均为实验组,无空白对照组D探究温度对淀粉酶活性影响实验中,不同温度条件下淀粉遇碘变蓝程度是因变量5．冬泳是一项深受大众喜爱的体育运动。

绝密★启用前广东省茂名市普通高中2020届高三毕业班下学期笫二次综合测试(二模)理综-化学试题(解析版)2020年5月可能用到的相对原子质量：H-1 Li- 7 C- 12 N-14 O-16 Na-23 S-32Cl-35.5 Ti-48 Fe-56 Ni-59 I-127 Ge-731.2020 年全球多个国家出现新型冠状病毒，此病毒具有非常强的传染性。

一次性医用口罩、84 消毒液、75%的医用酒精、过氧乙酸等是防疫期间常用物品。

下列说法正确的是A. 口罩用 84 消毒液消毒后可重复使用B. 生产口罩的关键材料聚丙烯属于新型无机材料C. 过氧乙酸和 84 消毒液均具有较强氧化性D. 75%的医用酒精和 84 消毒液混合使用效果更好【答案】C【解析】【详解】A. 84 消毒液的主要成分为次氯酸钠，具有强氧化性，口罩用 84 消毒液消毒后不可重复使用，故A错误；B.聚丙烯属于新型有机材料，故B错误；C. 过氧乙酸CH3COOOH和 84 消毒液（NaClO）均具有较强氧化性，故C正确；D. 75%的医用酒精和 84 消毒液混合使用会降低其消毒能力，酒精有还原性，次氯酸钠有强氧化性，两者可能发生反应生成有毒的氯气,故D错误；故答案选：C。

2.有机化合物 X()是合成重要医药中间体的原料。

下列关于化合物X说法错误的是A. 分子中有 7 个碳原子共平面B. 能使酸性 KMnO溶液褪色4C. 能与 HBr 发生加成反应D. X的同分异构体中不存在芳香族化合物【答案】A 【解析】【详解】A. 分子中存在碳碳双键,根据乙烯分子中有6个原子共面,可知该分子中有 5个碳原子共平面,分子中的六元环上的碳原子不能全部共面,故A错误；溶液褪色,故B正确；B. 含碳碳双键的有机物能使酸性 KMnO4C. 含碳碳双键的有机物能与 HBr 发生加成反应,故C正确；D. X含有2个环和一个碳碳双键,共3个不饱和度,苯环中含有4个不饱和度,则X 的同分异构体中不存在芳香族化合物,故D正确；故答案选：A。

2020年茂名市高三级第二次综合测试理科综合试卷第I卷一、选择题:本题共有8小题，每小题6分。

在每小题给出的四个选项中，第1～4题只有一项符合题目要求，第5～8题有多项符合要求。

全部选对的得6分，选对但不全的得3分，有选错的得0分。

1.下列说法中正确的是（）A. 一定强度的入射光照射某金属发生光电效应时，入射光的频率越高，单位时间内逸出的光电子数就越多B. 放射性的原子核发生衰变后产生的新核从高能级向低能级跃迁时，辐射出x射线C. 德布罗意在爱因斯坦光子说的基础上提出物质波的概念，认为只有高速运动的粒子才具有波粒二象性D. 核子是通过核力束缚在原子核内的【答案】D【解析】【详解】A．发生光电效应时，入射光的频率影响的是光电子的最大初动能，光强度影响单位时间内发出光电子的数目，故A错误；B．放射性的原子核发生衰变后产生的新核从高能级向低能级跃迁时，辐射出γ射线，故B 错误；C．德布罗意在爱因斯坦光子说的基础上提出物质波的概念，认为所有运动的粒子都具有波粒二象性，故C错误；D．核力只存在于相邻的核子之间．核力将核子束缚在核内，故D正确；故选D。

2.如图所示，在倾角为θ的光滑斜面上，用轻弹簧连接质量为2m的小球M和质量为m的小球N，N再用细线连接在斜面顶端，M、N都处于静止状态。

现用剪刀剪断细线，在用剪刀剪断细线的瞬间，两小球加速度大小为（）A. a M =gB. a M =gsinθC. a N =gsinθD.a N =3g sinθ【答案】D【解析】【详解】AB ．在剪断细绳的瞬间，弹簧的伸长量还没有来得及改变，恢复原状需要一个过程，所以在剪断细绳瞬间，弹簧的弹力不变，则M 的受力情况不变，合力仍为0，加速度仍为0，故AB 错误；CD ．在剪断绳子之前，对M 分析知，弹簧的弹力大小F =2mg sin θ 剪断细绳瞬间，N 受到重力、弹簧对它斜向下的拉力、支持力，根据牛顿第二定律得sin 3sin N mg F a g m+==θθ 故D 正确，C 错误；故选D 。

广东省茂名市五校联盟2020届高三第二次联考英语试题茂名市2020届五校联盟高三级第二次联考英语试卷本试题卷共 8 页。

全卷满分 120 分。

考试用时 100 分钟。

注意事项：l.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。

第一部分阅读理解（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 A、B、C 和 D 四个选项中，选出最佳选项。

AWith summer break coming up for children across the United States, now it's time to plan a fantastic summer trip for your family. Here ar e a few of the best places you can take your family to this year and any y e ar for that matter.Montgomery, AlabamaMontgome1y is an important site for learning about the history of the Civil Rights Movement. Childr e n with their families can visit the Civil Rights Memorial Center to take a tour of the exhibits and learn about the hopes and dreams and the struggle for equality in the country.Kenai Peninsula, AlaskaIf you are looking for a wonderful outdoor adventure, the Kenai Peninsula in Alaska is a fantastic trip. While visiting this region of Alaska, you can explore th e Kenai Mountains in Kenai Fjords (峡湾）Nation al Park, where your kids can see gla c iers , fjords and especiall y the Harding Icefield. Fishin g is another wonderful activity to enjoy at this destination.Channel Islands, CaliforniaThe Channel I s lands are an amazing archipelago （群岛）off the coast of California. Here visitors can enjoy the Channel Islands National Park. The Channel Islands National Park protects five of the islands. Within th e protection of the park there is a wide variety of wildlife, as well as natural and cultural resources. You should keep an eye out for seals, sea lions, dolphins, and many more.Memphis, TennesseeMemphis is a fantastic de s tination for families that enjoy music. This city played a gr e at role in the evolution of Blu e s music. You certainly won't want to mi s s out on a trip to Graceland while exploring Memphis. Th e home of Elvis Presley is open to visitors for tours, where you can trav e l through th e life and rise of Elvis.1.Where can you enjoy exhibitions during your trip?A. Montgomery.B. Kenai Peninsula.Channel Islands.D. Memphis.2.What can you do in the Kenai Peninsula?A .Listen to some music.B. Explore various wildlife.C. Try risking outdoors.D. Watch all kinds of fishes.3.What's the main purpose of the text?A. To give children some instructions.B. To introduce some trip sites for families.C. To adverti s e some famous attractions.D. To encourage children to learn in summer.BAbout 10 years ago, I sat in my office, struggling to write an annual progr e ss report for my leader. I enjoy writing scientific papers that engage my creativity and further my research.But report writing doesn’t come with any reward apart from the momentary satisfaction of finishing something. Like other routine paperwork, I find it hard to get through. So that day, I offered myself a reward: When I finished the report, I’d give myself 2 hours to examine slides（载玻片） der the microscope — a task I've always loved but never had much time for as a staff member. It's a strategy I call "just for fun".The strategy was born out of challenges I experienced in graduate school. I usually delayed putting together reports for university administrators until threatening letters arrived. I nev e r felt that paperwork was advancing my science, but rather sapping my energy and time for research. One of my committee members recognized and understood m y difficulties. Then he told me about his strategy of rewarding himself with a fun project when he completed a task that he didn't particularly enjoy. He advised me to think about doing something similar. I immediately liked the idea.Over the course of my career, this strategy helped me complete and move past the parts of my job that I didn'tparticularly enjoy. The rewards I gave myself provided a way to relax andreminded me why I love being a scientist.As for that annual report, I spent an ordinary morning on it but got it don e. Then I hurried over to the mi c roscope, e ager to insp e ct a series of slides that my collaborators（合作者）had sent a couple of weeks earlier. To others, it may have looked like work. But to me, it was just for fun.4.Why does the author dislike report writing?A. He receives too little from it.B. It is extremely easy to finish.C. It needs too much creativity.D. He doesn't major in writing.5.What does the underlined word "sapping" in Paragraph 2 probably mean?A. Acquiring.B. Consuming.C. Lacking. ·D. Providing.6.How did the author get his strategy?A. Through the inspiration of his report writing.B. Through the reward of his collaborators.C. Through the instructions of university administrators.D. Through a co mmi ttee mem ber’s suggestion.7.What can we learn from the author's experience?A. Choose a career you really like.B. Seek fun when doing science research.C. Motivate yourself to finish boring tasks.D. Reward yourself with a new strategy.CLegos have been a kind of popular toys for children for more than 60 years. When children get older, boxes of plastic Lego bricks often end up unused and stored in out-of-the-way places around the homes. Parents sometimes end up throwing the·Legos away.Now, the Lego Group toy company is testing a program to mak e sure the unwanted bricks do not go to waste. The program is called Lego Replay. It aims to make sure the unwanted building blocks continue to make children happy.Tim Brooks is the Lego company's vice president of environmental sustainability. He said, "Nearly all Lego bricks we see that are out there have lots more play value in them - multi-generation of play value. It's a waste of energy and resources to grind them up（碳碎）and make new bricks. "Brooks said the idea came from parents who do not know what to do with the old bricks. Placing old Legos in waste containers is not a good answer. Birds and other wildlife may try to eat what looks like colorful food - with deadly results.With the Lego Replay program, parents load unwanted Legos of all shapes and colors into boxes. Then, they go to the program website and print out a mailing label. The boxes ar e sent to processing centers, where the bricks are sorted, cleaned and shipped to aid groups and donation centers.The Lego Replay test program is set to last through March. If it is successful, the program may be expanded to include other Lego products.The Lego Group is also looking at other materials to use in their toys. While plastic has proved to be the strongest material, Lego has begun making some bricks out of sugar cane（甘庶）．8.What's the main purpose of Lego Replay?A. To entertain those children without toys.B. To make unwanted Lego bricks reused.C. To prevent parents to throw the Legos away.D. To avoid using unwanted bricks by storing them.9.Where are unwanted Lego bricks sorted and cleaned according to Lego Replay?A. At processing centers.B. At donation centers.C. On the program website.D. In the owners' homes.10.What does Brooks probably agree with?A. Lego bricks waste too many resources.B. Unwanted Lego bricks still have value.C. We should store old Legos in waste containers.D. Lego bricks are favorite food of some birds.11.What does the Lego Group explore according to the last paragraph?A. More other Lego products.B. Proper use of plastics.C, Similar products to sugar cane.D. New materials of producing bricks.DEngineers at the University of California San Diego have developed a new method that doesn't require any special equipment and works in just minutes to create soft, flexible, 3D-printed robots.The innovation comes from rethinking the way soft robots are built: instead of figuring out how to add soft materials to a rigid robot body, the UC San Diego researchers started with a soft body and added rigid features to key components. Thestructures were inspired by insect exoskeletons, which have both soft and rigid parts - the researchers called their creations " flexoskeletons（柔性外骨骼）”．The new method allows for the construction of softcomponents for robots in a small hit of the time previously needed and for a small bit of the cost." We hope that these flexoskeletons will lead to. the creation of a new class of soft robots, ” said Nick Gravish, a mechanical engineering professor at the Jacobs School of Engineering at the UC San Diego and the paper's senior author. "We want to make soft robots easier to build for researchers all over the world. "The new method makes it possible to build large groups of flexoskeleton robots with little hand assembly（装配）as well as assemble a library of Lego-like components so that robot parts can be eas ily swapped.Researchers detail their work in the April 7 issue of the journal Soft Robotics. The team plans to make their designs available to researchers at other institutions as well as high schools.One flexoskeleton component takes 10 minutes to print and costs less than $1. Flexoskeleton printing can be done on most low-cost commercially available printers. Printing and assembling a whole robot takes under two hours.The final goal is to create an assembly line that prints whole flexoskeleton robots without any need for hand assembly. These small robots could do as much work as one massive robot on its own ---- or more.12.What does Paragraph 2 mainly talk about?A. The origin of the new method.B. The function of the new method.C. The advantages of the new method.D. The cost of the new method.13.What's Nick's attitude towards flexoskeletons?A. Indifferent.B. Skeptical.C. Curious.D. Hopeful.14.What will researchers intend to do with flexoskeletons?A. Benefit most students.B. Produce a lot of flexoskeleton robots.C. Build robots by hand.D. Create many larger ones.15.What can be the best title for the text?A. New Robots Made of Special Equipment and MaterialsB. A New Method of Building Giant, Soft and Flexible RobotsC. Flexoskeletons Make Soft Robots Faster and Cheaper to MakeD. Flexoskeletons Create Lots of Soft Robots with Hand Assembly第二节（共5 小题；每小题 2 分，满分10 分）根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。

7．化学与生活密切相关，下列说法正确的是（）A．石油分馏可获得乙烯、丙烯和丁二烯B．淀粉、油脂和蛋白质都是高分子化合物C．煤经过气化和液化等物理变化可以转化为清洁燃料D．食盐可作调味剂，也可作食品防腐剂8．设NA为阿伏伽德罗常数的值，下列叙述正确的是（）A．标准状况下，中含有硫原子的数目为B．常温常压下，乙烯与丙烯的混合物中含有氢原子的数目为NAC． 50ml，L浓硫酸与足量铜充分反应，生成SO2分子的数目为D．某密闭容器盛有1molO2和2molSO2，在一定条件下充分反应，转移电子的数目为4NA 9．四种短周期主族元素W、X、Y、Z的原子序数依次増大，W、X的简单离子具有相同电子层结构，X的原子半径是短周期主族元素中最大的，W与Y同族，Z与X形成二元化合物的水溶液呈中性。

下列说法正确的是（）A．简单离子半径：W<X<Z B．W与X形成的化合物溶于水后溶液呈碱性C．气态氢化物的沸点：W<Y D．最高价氧化物的水化物的酸性：Y>Z 10．2013年3月我国科学家报道了如图所示的水溶液锂离子电料体系。

下列叙述正确的是（）A．b为电池的正极B．电池放电时，总反应为Li1-xMn2Ox+xLi=LiMn2O4C．放电时，a极锂的化合价发生变D．充电时，溶液中Li+从b向a迁移11．下列坐标图均涉及平衡原理，其中相关表述正确的是（）A．图①表示室温下，用·L-1氨水吸收HCl气体时，实线表示c(NH3·H2O)，虚线表示c(NH4+)，处M点的溶液呈中性B．图②表示2SO2(g)+O2(g) 2SO3(g) △H＜0正逆反应的平衡常数K随温度的变化C．图③表示恒温恒压2NH3(g) 3H2(g)+N2(g)达平衡时，N2的物质的量与通入NH3的物质的量的变化关系D．图④表示AgCl(s) Ag+(aq)+Cl-(aq)的离子的浓度关系，当处于b点时，蒸发部分的水后，可以到达平衡线的a点处选项实验目的主要仪器试剂A 分离Br2和CCl4混合物分液漏斗、烧杯Br2和CCl4混合物、蒸馏水B 探究淀粉的水解程度试管、烧杯、酒精灯淀粉溶液、银氨溶液C探究石蜡油分解产物是否含有不饱和烃硬质试管、酒精灯，铁架台、导管石蜡油、碎瓷片、酸性高锰酸钾溶液D 测定NaOH溶液浓度酸式滴定管、碱性滴定管、锥形瓶、烧杯NaOH溶液、L盐酸选项实验现象结论A将稀硝酸加入过量铁粉中，充分反应后滴加KSCN溶液有气体生成，溶液呈血红色稀硝酸将Fe氧化为Fe3+B 将铜粉加·L-1Fe2(SO4)3溶液中溶液变蓝、有黑色固体出现金属铁比铜活泼C用坩埚钳夹住一小块用砂纸仔细打磨过的铝箔在酒精灯上加热熔化后的液态铝滴落下来金属铝的熔点较低D往含有等浓度MgSO4溶液与CuSO4溶液的混合溶液中，逐滴入NaOH溶夜至不再有沉淀产生先有浅蓝色沉淀生成，后有白色沉淀Cu(OH)2的溶度积比Mg(OH)2的小26．（14分）氮化镁（Mg3N2）是工业上应用广泛的离子化合物，常温下为浅黄色粉末，极易与水反应。

2020届广东省茂名市高三下学期5月第二次综合模拟考试理科综合物理试卷★祝考试顺利★（解析版）第I卷一、选择题:本题共有8小题,每小题6分。

在每小题给出的四个选项中,第1～4题只有一项符合题目要求,第5～8题有多项符合要求。

全部选对的得6分,选对但不全的得3分,有选错的得0分。

1.下列说法中正确的是（）A. 一定强度的入射光照射某金属发生光电效应时,入射光的频率越高,单位时间内逸出的光电子数就越多B. 放射性的原子核发生衰变后产生的新核从高能级向低能级跃迁时,辐射出x射线C. 德布罗意在爱因斯坦光子说的基础上提出物质波的概念,认为只有高速运动的粒子才具有波粒二象性D. 核子是通过核力束缚在原子核内的【答案】D【详解】A．发生光电效应时,入射光的频率影响的是光电子的最大初动能,光强度影响单位时间内发出光电子的数目,故A错误；B．放射性的原子核发生衰变后产生的新核从高能级向低能级跃迁时,辐射出γ射线, 故B错误；C．德布罗意在爱因斯坦光子说的基础上提出物质波的概念,认为所有运动的粒子都具有波粒二象性,故C错误；D．核力只存在于相邻的核子之间．核力将核子束缚在核内,故D正确；故选D。

2.如图所示,在倾角为θ的光滑斜面上,用轻弹簧连接质量为2m的小球M和质量为m的小球N,N再用细线连接在斜面顶端,M、N都处于静止状态。

现用剪刀剪断细线,在用剪刀剪断细线的瞬间,两小球加速度大小为（）A. a M =gB. a M =gsinθC. a N =gsinθD. a N =3g sinθ【答案】D 【详解】AB ．在剪断细绳的瞬间,弹簧的伸长量还没有来得及改变,恢复原状需要一个过程,所以在剪断细绳瞬间,弹簧的弹力不变,则M 的受力情况不变,合力仍为0,加速度仍为0,故AB 错误；CD ．在剪断绳子之前,对M 分析知,弹簧的弹力大小F =2mg sin θ 剪断细绳瞬间,N 受到重力、弹簧对它斜向下的拉力、支持力,根据牛顿第二定律得sin 3sin N mg F a g m+==θθ 故D 正确,C 错误；故选D 。

二、选择题：共8小题，每小题6分，在每小题给出的四个选项中，第14~17题只有一项符合题目要求，第18~21题有多项符合题目要求，全部选对得6分，选对但不全的得3分，有选错的得0分14．一质点做匀变速直线运动，已知初速度大小为v ，经过一段时间速度大小变为2v ，加速度大小为a ，这段时间内的路程与位移之比为5：3，则下列叙述正确的是A ．这段时间内质点运动方向不变B ．这段时间为3v aC ．这段时间的路程为232v aD ．再经过相同时间质点速度大小为3v14．B 这段时间内质点的路程与位移不同，加速度又恒定，质点一定是做类似竖直上抛的运动，A 错误；末速度与初速度方向相反，所以时间2()3v v v t a a--==，B 正确；根据2202t v v as -=可计算出路程为252v a ，位移为232v a，C 错误；再经过相同时间质点速度大小为5v ，D 错误。

15．如图甲所示为研究某金属光电效应的电路图，图乙为采用不同频率的光照射时遏止电压c U 与入射光频率v 的关系图，图中频率12νν、，遏制电压12C C U U 、及电子的电荷量e 均为已知，则下列说法正确的是A ．普朗克常量()2121C C e U U h νν-=-B ．普朗克常量()2121C C e U U h νν+=- C ．该金属的截止频率为2112021C C C C U U U U ννν+=-D ．该金属的截止频率为1221021C C C C U U U U ννν-=- 15．A 根据爱因斯坦光电效应放出0k E h W ν=-及动能定理c k eU E =可得0c hh U e eνν=-，结合图像可知2112112C C C U U U h k e νννν-===--，普朗克常量，()2121C C e U U h νν-=-，2112021C C C C U U U U ννν-=-，A 正确BCD 错误； 16．2018年12月9日新浪网报道，为了预防太空垃圾的撞击，国际空间站安装了太空碎片传感器（简称SDS ）。

2020届广东省茂名市高三下学期第二次综合模拟考试英语试卷★祝考试顺利★(解析版)本试卷共8页,三大题,满分120分。

考试用时120分钟。

注意事项：1.答卷前,考生务必将自己的姓名、考生号、考场号和座位号填写在答题卡上。

因测试不考听力,从第二部分的“阅读理解”开始,试题序号从“21”开始。

2.回答选择题时,选出每小题答案后,用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。

回答非选择题时,将答案写在答题卡上。

写在本试卷上无效。

3.考试结束后,将本试卷和答题卡一并交回。

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A、B、C和D四个选项中,选出最佳选项。

AThere are many reasons to choose a career. Talent ranks highly, as does interest- and of course, you need to get paid enough money to live on. For some, their career path is also guided by a sense of altruism （利他主义）. They are looking for a job where they can make a difference in their communities and the world. There are some jobs here for every altruistic soul.Occupational Therapist（疗法专家）People with this job help patients young and old improve the sill they need for everyday living.Patients might be children on the autism（自闭症）,mature adults recovering from physical illness or injury, and everyone in between. This job requires a master’s degree and professional license.Median Annual Salary：$65,185Job Outlook（2016-26）：24 percent growthDietitianDietitians advise clients on healthy eating with a variety of goals,from supporting medical treatment, weight loss to managing illnesses like diabetes（糖尿病）.Dietitians typically have a bachelor's degree, and their pay may rise with specific skill sets.Median Annual Salary：$51,982Job Outlook（2016-26）：15 percent growthRegistered NurseNurses provide patient care in a variety of in-patient and out-patient settings, including hospi tals, doctor’s offices, clinics, and patients' homes. They also help care and educate patients and their families about health and disease management. Many hospitals now require bachelor's degrees for their nurses. All registered nurses must be licensed.Median Annual Salary：$62,962Job Outlook（2016-26）：15 percent growthDoctorPhysicians and surgeons obviously make a real difference in patients' lives and contribute to the health of the community at large. They also get paid well：depending on their specialty, they can earn well over $200,000 a year. On the other hand, they may need that money to pay off their school fees: doctors undergo nine years or more of post- secondary education and training.Median Annual Salary：$140,506Job Outlook（2016-26）：13 percent growth1. If you want to become an occupational therapist, you should________.A. have a bachelor’s degreeB. have a master's degreeC. be experienced in curing the autismD. be only aware of the medical condition2. Which kind of job has the lowest outlook?A. An occupational therapist.B. A dietitian.C. A registered nurse.D. A doctor.。

2020 年茂名市高三级第二次综合测试理科综合试卷生物部分一、选择题1.下列有关叙述，正确的是（）A.细胞的线粒体、叶绿体和核糖体中都能产生水B.磷脂、蛋白质、核酸是T2 噬菌体重要的有机物C.动物体的内质网中合成的磷脂可以转运到核糖体D.人体细胞的细胞质基质中可通过细胞呼吸产生CO22.酵母菌和大肠杆菌是生物研究的模式微生物。

我国完成了酿酒酵母体内部分染色体的人工合成。

对此有关叙述错误的是（）A.这些模式微生物的遗传密码都是通用的B.人工合成染色体增加了酵母菌的遗传多样性C.酿酒酵母和大肠杆菌的遗传信息在细胞核中转录D.人工酵母与天然酵母细胞中的染色体不完全相同3.研究发现新型冠状病毒外有包膜，这层包膜主要来源于宿主细胞膜，还含有病毒自身的糖蛋白S,从而使病毒识别并侵入其宿主细胞。

下列相关说法正确的是（）A.病毒外包膜的成分与肺炎双球菌的荚膜成分相同B.宿主细胞如癌变，其黏着性减弱是因为糖蛋白S减少C.新型冠状病毒进入细胞的过程体现了生物膜的选择透过性D.新型冠状病毒蛋白质变性后仍会与双缩脲试剂发生颜色反应4.GABA 是一种中枢抑制性神经递质，当GABA 与突触后膜上的相应受体结合，使受体蛋白的结构发生变化，导致Cl-通过该蛋白内流。

药物BZ能提高该蛋白对Cl-的通透性。

下列对此分析正确的是（）A.GABA 能提高神经细胞的兴奋性B.GABA 的受体具有转运功能C.BZ 会提高肌肉对神经递质的应答反应D.Cl-内流使突触后膜两侧电位差减小5.科学家在对黄化豌豆幼苗切段的实验研究中发现，切段内一定浓度的生长素会促进细胞的伸长，当生长素浓度达到一定值后就会促进乙烯的合成，而乙烯含量的增高，反过来又抑制了生长素促进切段细胞的伸长 作用。

该事实说明（ ）A. 生长素是合成乙烯的原料B. 乙烯主要作用是促进果实成熟C. 高浓度乙烯抑制生长素的极性运输D. 生长素和乙烯在促进植物生长中表现6. 如图为某单基因遗传病在一个家庭中的遗传图谱。