已知平行四边形中，，，则此平行四边形面积的最大值为_____．

以下物质间的每步转化通过一步反应能实现的是（ ）
A. Al－Al2O3－Al(OH)3－NaAlO2 B. N2－NH3－NO2－HNO3
C. Cu－CuO－Cu(OH)2－CuSO4 D. Na－Na2O2－Na2CO3－NaOH

《孙子兵法》说：“凡战者，以正合，以奇胜。”对于当前我国经济改革，“守正”是遵循、顺应、乃至敬畏市场力量和规律，“出奇”是不能简单照搬其他市场经济体制的经验和我们以前探索市场经济的初步经验，必须在创新开拓中“出奇制胜”。下列正确理解的是：
①在“守正”中“出奇”，树立了创新意识
②“守正”与“出奇”相反相成、和合共生
③“守正”是必要前提，“出奇”是必然结果
④“守正”与“出奇”相互联结，“守正”包含“出奇”
A. ①② B. ③④ C. ①③ D. ②④

在平面内，A，B是两个定点，C是动点，若，则点C的轨迹为（    ）

A. 圆                                B. 椭圆                             C. 抛物线                         D. 直线

如图是不同类型国家的进出口依存度变化示意图。该图适合用来说明

A. 发展中国家经济高速增长                                      B. 世界经济区域化的发展

C. 发达国家经济陷入了滞胀                                      D. 世界贸易全球化加强

下列有关化学反应的叙述正确的是

A. 室温下，Na在空气中反应生成Na₂O₂

B. 室温下，Al与4.0 mol﹒L^-1NaOH溶液反应生成NaAlO₂

C. 室温下，Cu与浓HNO₃反应放出NO气体

D. 室温下，Fe与浓H₂SO₄反应生成FeSO₄

痤疮是一种常见的皮肤病，又被称为“青春痘”。雄性激素与皮脂腺细胞内的受体结合，进入细胞核，引起脂质分泌。雄性激素水平升高导致脂质分泌增多，堵塞毛囊口，形成痤疮。由于毛囊内的痤疮丙酸杆菌大量繁殖，因此痤疮通常会伴随炎症的发生。青少年是痤疮的常发人群。下列有关叙述错误的是(　　)
A. 痤疮丙酸杆菌是一种厌氧微生物，繁殖所需的能量只能来自细胞质
B. 雄性激素的受体在细胞内，通过调节脂质合成代谢影响脂质的分泌
C. 痤疮患者体内通常能检测到抗痤疮丙酸杆菌抗体的存在
D. 痤疮发生的直接原因是雄性激素水平升高和痤疮丙酸杆菌异常增殖

People have grown taller over the last century, with South Korean women shooting up by more than 20cm on average, and Iranian men gaining 16.5cm. A global study looked at the average height of 18-year-olds in 200 countries 1914 and 2014. The results show that while Swedes were the tallest people in the world in 1914, Dutch men have risen from l2th place to claim top spot with an average height of 182.5cm. Larvian women, meanwhile, rose from 28th place in 1914 to become the tallest in the world a century later, with an average height of 169.8cm. James Bentham, a co-author of the research says the global trend is likely but once you average over whole populations, genetics plays a less key role," he added.
But while height has increased around the world, the trend in many countries of north and sub-Saharan Africa causes concern, says Elio Riboli of Imperial College. While height increased in Uganda and Niger during the early 20th century, the trend has reversed in recent years, with height decreasing among 18-year-olds.
"One reason for these decreases in height is the economic situation in the 1980s," said Professor Alexander. The nutritional and health problems that followed the policy of structural adjustment, he says, led to many children and teenagers failing to reach their full potential in terms of height.
Bentham believes the global trend of increasing height has important implications. "How tall we are now is strongly influenced by the environment we grew up in," he said. "If we give children the best possible start in life now, they will be healthier and more productive for decades to come."
【1】What can be learned from Paragraph I?
A.The increase in women’s height is much bigger than men’s in the last century.
B.The last century has seen a great increase in people’s height in most countries.
C.Genetics plays a key role in the increase of people’s height in the last century.
D.Dutch and Swedes are ranked first and second in height in the world nowadays.
【2】The underlined word "reversed" in Paragraph 2 can be replaced by .
A.slowed down. B.gone upwards. C.changed to the contrary. D.come to life again.
【3】According to the text,James Bentham suggests that .
A.The economic situation of some countries should be improved.
B.Environment protection should be attached great importance to.
C.The global trend of increasing height should be closely watched.
D.Children’s proper nutrition and healthcare should be guaranteed.

据报道，2014年3月4日英国兰开夏郡的一名13岁学生杰米·爱德华兹在学校实验室里成功完成了一项核实验，成为世界上实现聚变的最年轻的人，引起人们对氢元素、氢的同位素、核反应的热议．下列说法错误的是（ ）
A. 氢原子光谱是线状谱
B. 氘()可以发生衰变
C. 是核聚变
D. 核裂变是可控的

(2019·浙江杭州一次质检)A child, if actively ________ (engage) in classroom activities, can be taught many things.

请认真阅读下面的图表，然后用一个转折关系的句子写出民办和公办幼儿园两者的变化趋势及比较情况。要求：不得出现具体数字，不超过50字。

下图为某几何体的三视图，则该几何体的表面积是（    ）

A. 6+4                        B. 4+4                         C. 6+2                         D. 4+2

We are the products of evolution, and not just evolution that occurred billions of years ago. As scientists look deeper into our genes (基因), they are finding examples of human evolution in just the past few thousand years. People in Ethiopian highlands have adapted to living at high altitudes. Cattle -raising people in East Africa and northern Europe have gained a mutation (突变) that helps them digest milk as adults.

On Thursday in an article published in Cell, a team of researchers reported a new kind of adaptation - not to air or to food, but to the ocean. A group of sea-dwelling people in Southeast Asia have evolved into better divers. The Bajau, as these people are known, number in the hundreds of thousands in Indonesia, Malaysia and the Philippines. They have traditionally lived on houseboats; in recent times, they’ve also built houses on stilts (支柱) in coastal waters. “They are simply a stranger to the land,” said Redney C. Jubilado, a University of Hawaii researcher who studies the Bajau.

Dr. Jubilado first met the Bajau while growing up on Samal Island in the Philippines. They made a living as divers, spearfishing or harvesting shellfish. “We were so amazed that they could stay underwater much longer than us local islanders,” Dr. Jubilado said. “I could see them actually walking under the sea.”

In201, Melissa Ilardo, then a graduate student in genetics at the University of Copenhagen, heard about the Bajau. She wondered if centuries of diving could have led to the evolution of physical characteristics that made the task easier for them. “it seemed like the perfect chance for natural selection to act on a population,” said Dr. Ilardo. She also said there were likely a number of other genes that help the Bajau dive.

32. What does the author want to tell us by the examples in paragraph 1?

A. Environmental adaptation of cattle raisers.                 B. New knowledge of human evolution.

C. Recent findings of human origin.                              D. Significance of food selection.

33. Where do the Bajau build their houses?

A. In valleys.                      B. Near rivers.                    C. On the beach.                 D. Off the coast.

34. Why was the young Jubilado astonished at the Bajau?

A. They could walk on stilts all day.                              B. They had a superb way of fishing.

C. They could stay long underwater.                              D. They lived on both land and water.

35. What can be a suitable title for the text?

A. Bodies Remodeled for a Life at Sea                           B. Highlanders’ Survival Skills

C. Basic Methods of Genetic Research                            D. The World’s Best Divers

以下涉及物理学史上的四个重大发现,其中说法 不 正确的是
A. 卡文迪许通过扭秤实验,测定出了万有引力常量
B. 奥斯特通过实验研究,发现了电流周围存在磁场
C. 牛顿根据理想斜面实验,提出力是改变物体运动状态的原因
D. 纽曼、韦伯在对理论和实验资料进行严格分析后,总结出后人称之为法拉第电磁感应定律的结论

The Lake District Attractions Guide

Dalemain Mansion & Historic Gardens

History, Culture & Landscape（景观）. Discover and enjoy 4 centuries of history, 5 acres of celebrated and award-winning gardens with parkland walk. Owned by the Hasell family since 1679, home to the International Marmalade Festival. Gifts and antiques, plant sales, museums & Mediaeval Hall Tearoom.

Open：29 Mar-29 Oct，Sun to Thurs.

Tearoom，Gardens & Gift Shop：10.30-17.00（16.00 in Oct）.

House：11.15-16.00（15.00 in Oct）

Town: Pooley Bridge & Penrith

Abbot Hall art Gallery & Museum

Those viewing the quality of Abbot Hall’s temporary exhibitions may be forgiven for thinking they are in a city gallery. The impressive permanent collection includes Turners and Romneys and the temporary exhibition programme has Canaletto and the artists from St Ives.

Open: Mon to Sat and Summer Sundays. 10.30 -17.00 Sumner.10.30 -16.00 Winter.

Town：Kendal

Tullie House Museum & Art Gallery

Discover, explore and enjoy award-winning Tullie House, where historic collections, contemporary art and family fun are brought together in one impressive museum and art gallery. There are four fantastic galleries to visit from fine art to interactive fun, so there’s something for everyone!

Open: High Season 1 Apr – 31 Oct: Mon to Sat 10.00 – 17.00, Sun 11.00 – 17.00.

      Low Season 1 Nov – 31 Mar: Mon to Sat 10.00 – 16.30, Sun 12.00 – 16.30.

Town: Carlisle

Dove Cottage & The wordsworth Museum

Discover William Wordsworth’s inspirational home. Take a tour of his Lakeland cottage, walk through his hillside garden and explore the riches of the collection in the Museum. Visit the shop and relax in the café. Exhibitions, events and family activities throughout the year.

Open: Daily, 09.30 – 17.30 (last admission 17.00).

Town: Grasmere

21. When is the House at Dalemain Mansion & Historic Gardens open on Sundays in July?

A.09.30—17.30.    B.10.30—16.00.         C. 11.15—16.00.        D.12.00—16.30

22. What can visitors do at Abbot Hall Art Gallery & Museum?

A. Enjoy Ronney’s works.

B. Have some interactive fun.

C. Attend a famous festival.

D. Learn the history of a family

23. Where should visitors go if they want to explore Wordsworth’s life?

A. Penrith.                  B. Kendal.                      C. Carlisle.                     D. Grasmere.

阅读下面的文字，完成小题。
朱震，字子发，荆门军人。登政和进士第，仕州县以廉称。胡安国一见大器之，荐于高宗，召为司勋员外郎，震称疾不至。会江西制置使赵鼎入为参知政事，上谘以当世人才，鼎曰：“臣所知朱震，学术深博，廉正守道，士之冠冕，使位讲读，必有益于陛下。”上乃召之。既至，上问以《易》《春秋》之旨，震具以所学对。上说，擢为祠部员外郎，兼川、陕、荆、襄都督府详议官。震因言：“荆襄之间，沿汉上下，膏腴之田七百余里。若选良将领部曲镇之招集流亡务农种谷寇来则御寇去则耕不过三年兵食自足观衅而动，席卷河南，此以逸待劳，万全计也。”迁秘书少监兼侍经筵，转起居郎。建国公出就傅，以震为赞读。迁中书舍人兼翊善。时郭千里除将作监丞，震言：“千里侵夺民田，曾经按治，愿寝新命。”从之。转给事中兼直学士院，迁翰林学士。是时，虔州民为盗，天子以为忧，选良太守往慰抚之。将行，震曰：“使居官者廉而不扰，则百姓自安，虽诱之为盗，亦不为矣。愿诏新太守到官之日，条具本郡及属县官吏有贪墨无状者，一切罢去，听其自择慈祥仁惠之人，有治效者优加奖劝。”上从其言。故事，当丧无享庙之礼。时徽宗未袱庙①，太常少卿吴表臣奏行明堂之祭。震因言：“《礼记》云：‘丧三年不祭，惟天地社稷为越绋②而行事。’《春秋》书‘夏五月乙酉，吉，禘③于庄公’，《公羊传》曰‘讥始不三年也’。国朝景德二年，真宗居明德皇后丧，既易月而除服。当时未行三年之丧，专行以日易月之制可也，在今日行之则非也。”七年，震谢病丐祠，旋知礼部贡举，会疾卒。
（节选自《宋史·朱震传》）
（注）①袱庙：安葬逝者之前，先在祖庙祭祀，并安放逝者的牌位。②越绋：指不受私丧限制，参加祭祀天地社稷的典礼。③古代帝王或诸侯在始祖庙里对祖先的一种盛大祭祀
【1】下列对文中画波浪线部分的断句，正确的一项是
A. 若选良将领/部曲镇之/招集流亡/务农种谷/寇来则御/寇去则耕/不过三年/兵食自足/
B. 若选良将领/部曲镇之/招集流亡/务农种谷/寇来则御寇/去则耕/不过三年/兵食自足/
C. 若选良将/领部曲镇之/招集流亡/务农种谷/寇来则御寇/去则耕/不过三年/兵食自足/
D. 若选良将/领部曲镇之/招集流亡/务农种谷/寇来则御/寇去则耕/不过三年/兵食自足/
【2】下列对文中加点词语的相关内容的解说，不正确的一项是
A. 明堂，古代帝王宣明政教、举行大典的地方。朝会、祭祀等大典，都在此处举行。
B. 经筵，古代帝王为研习佛经而专门设立的御前讲席。汉代发轫，但宋代始称经筵。
C. 丐祠，请任祠禄官。祠禄官为主管祭祀的闲职，一般由年老不能任事的大臣担任。
D. 《公羊传》，传为战国时齐人公羊高所著，与《左传》《谷梁传》合称春秋三传。
【3】下列对原文有关内容的概括和分析，不正确的一项是
A. 朱震为官清廉，受到赏识。胡安国非常器重他，曾将他推荐给宋高宗。赵鼎入朝担任参知政事，也向皇上推荐了朱震。
B. 朱震学识渊博，得到恩宠。受召见时，他的回答得到皇帝认可，授任祠部员外郎，兼任川、陕、荆、襄都督府详议官。
C. 朱震聪明智慧，头脑灵活。他认为造成虔州百姓偷盗成风的原因在于各级官员贪腐扰民，建议皇上由当地百姓选任官吏。
D. 朱震坚持礼制，敢于直言。徽宗去世后尚未安葬，吴表奏请朝廷举行明堂祭祀大典，朱震认为丧期未满，不应该举行。
【4】把文中画横线的句子翻译成现代汉语。
（1）千里侵夺民田，曾经按治，愿寝新命。
（2）七年，震谢病丐祠，旋知礼部贡举，会疾卒。

阅读下面的文字，完成下列小题。
文明是多彩的，人类文明因多样才有交流互鉴的价值。阳光有七种颜色，世界也是多彩的。一个国家和民族的文明是一个国家和民族的集体记忆。人类在漫长的历史长河中，发展和创造了多姿多彩的文明。从茹毛饮血到田园农耕，从工业革命到信息社会，构成了 的文明图谱，书写了激荡人心的文明华章。“一花独放不是春，百花齐放春满园。”如果世界上只有一种花朵，就算这种花朵再美，那也是单调的。不论是中华文明，还是世界上存在的其它文明，都是人类文明创造的成果。
文明是平等的，人类文明因平等才有交流互鉴的前提。各种人类文明在价值上是平等的，都________，也各有不足。世界上不存在十全十美的文明，也不存在 的文明，文明没有高低、优劣之分。
（ ）。海纳百川，有容乃大。人类创造的各种文明都是劳动和智慧的结晶。每一种文明都是独特的。在文明问题上，生搬硬套、________不仅是不可能的，而且是十分有害的。一切文明成果都值得尊重，一切文明成果都要珍惜。
【1】依次填入文中横线上的成语，全都恰当的一项是（ ）
A. 气冲霄汉 各得其所 一无是处 因噎废食
B. 波澜壮阔 各有千秋 一无是处 削足适履
C. 气冲霄汉 各有千秋 一无所取 因噎废食
D. 波澜壮阔 各得其所 一无所取 削足适履
【2】下列在文中括号内补写的语句，最恰当的一项是（ ）
A. 文明是包容的，人类文明因包容才有互鉴交流的源泉。
B. 文明是前进的，这使得人类文明有了交流互鉴的动力。
C. 文明是包容的，人类文明因包容才有交流互鉴的动力。
D. 文明是前进的，这使得人类文明有了互鉴交流的源泉。
【3】文中画横线的句子有语病，下列修改最恰当的一项是（ ）
A. 在漫长的历史长河中，人类多姿多彩地发展和创造了文明。
B. 人类在漫长的历史长河中，多姿多彩地创造和发展了文明。
C. 在漫长的历史长河中，人类发展和创造了多姿多彩的文明。
D. 人类在漫长的历史长河中，创造和发展了多姿多彩的文明。

如图所示，A球在B球的斜上方，两球相向水平抛出。若要使两球在与两球抛出的距离相等的竖直线上相遇，则

A. A、B两球要同时抛出
B. B球要先抛出
C. A球抛出时的速度大于B球抛出时的速度
D. A球抛出时的速度小于B球抛出时的速度

阅读下面材料，根据要求写一篇不少于800字的作文。
在美国，波浪谷绝对算得上一个奇特的景点，不仅因为它景观奇特，而且因为它每天只卖20张门票。波浪谷位于美国亚利桑那州北部，是一个朱红悬崖的峡谷，那里有五彩缤纷的奇石，砂岩上的纹路像波浪一样，波浪谷也因此而得名。为了能亲眼看到这令人窒息的美景，世界各国的旅游者纷至沓来。许多旅游开发商见此情景，立刻想到要把波浪谷开发成一个旅游景点。就在此时，美国政府出面坚定地提出：波浪谷是地球的财富，是全人类的财富，我们要做的就是保护、保护、再保护！我们坚决不能让它们成为一两代人的玩具，而要留给千秋万代。但是怎样做才能既使波浪谷不受到破坏，又能让众多旅游者欣赏到它的美呢？在地质学家和环境保护专家的意见指导下，美国政府作出了一个两全其美的规定：波浪谷每天只发放20张门票，全球不分国家、种族、信仰、贫富，均可通过现场申请或网上申请的方式索票，机会均等。
要求：选准角度，明确立意，自拟题目；不要脱离材料内容及含意的范围作文，不要套作，不要抄袭。

2018年11月26日，南方科技大学教授贺建奎宣布，一对基因编辑婴儿健康诞生。基因编辑是应对遗传性疾病的一种潜在治疗办法，但由于基因编辑技术仍然存在严重“脱靶”风险，并对人类的基因会产生不可预测、无法控制的严重影响，会引发严重的伦理危机。基因编辑技术的运用极具争议，国内外不少专家表示强烈造责。这体现的认识论道理有
①对基因编辑婴儿的认识受主客观因素的制约，具有主体差异性
②知识结构和立场的不同决定了不同专家对基因编婴儿持有不同态度
③从基因编辑婴儿的诞生到专家们提出质疑，体现了认识具有反复性
④基因编辑技术存在严重“脱靶”风险，需要在实践中继续检验和完善
A. ①② B. ①④ C. ②③ D. ③④