针对性训练检测答案
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翰林卷浙教版八年级针对性训练答案一、积累运用(38分)选择题1—6题。
(1 4分)1.以下加点字的注音,全部恰当的一组就是(2分后)a.氛围(fēn) 脊梁(jǐ) 污秽(suì) 扣人心弦(xián)b.喷溅(bèng) 嶙峋(lín) 少脉(qiǎn) 恹恹欲睡(yān)c.香醇(chún) 跻身(jī) 飞窜(cuàn) 争妍斗艳(yán)d.为重(chèn) 模样(mú) 倾听(línɡ) 卷帙浩繁(yì)2. 下列文句的空缺处,依次填入的词语恰当的一组是(2分)①春天去了,天气暖化,冰雪已经开始融化,树枝上也绽出了嫩芽。
②如果对中国人民的严正声明和强烈抗议,一意孤行,必将自食其果。
③小自然用“死去”的物质了这样丰富多彩的生命,而人类却无法出来一个哪怕就是最简单的生物。
a.逐步置之不理创造制造b.逐渐置之度外制造创造c.逐步置之度外生产缔造d.逐渐置之不理缔造生产3. 下列各句中,加点的成语使用错误的一项是(2分)a. 从新城区至老城区,沿街庄严优雅的建筑,精巧中那股秀气的园林,温文尔雅、质朴守礼的市民并使外地游客的喜悦之情油然而生。
b. 新来的王老师为人不苟言笑,只有校长有时还能跟他开点无伤大雅的玩笑。
c. 网络交友已就是许多人玩腻了的游戏,可以有些年轻人依然乐此不疲,一个个前赴后继地乌进来。
d. 有些干部不注重调查研究,到了基层,下车伊始就发议论,提意见。
4. 下面句子中,没语病的一句就是(2分后)a.为了防止地球环境不恶化,我们应站在可持续发展的高度,合理开发和利用自然资源。
b.居里夫人为科学而奉献的精神和品质就是应该我们自学的榜样。
c.“中国梦”记录着中华民族从饱受屈辱到赢得独立解放到改革开放。
d. 生活存有多宽广,语文就存有多宽广。
因此,我们不仅必须在课堂上学语文,还要在生活中学语文。
2022中考社会法治总复习《针对性训练》检测一1、【单选题】坚持和发展(),实现中华民族的伟大复兴,是当代中国最大的现实,也是全体中国人民共同的社会理想。
[单选题] *A.社会主义B.中国特色社会主义(正确答案)C.市场经济D.中华优秀传统文化2、法律至上尤其指()至上,因为它具有最高的法律效力,是其他一切法律的依据。
[单选题] *A、宪法(正确答案)B、国际条约C、行政法规D、基本法律3、【单选题】自由、平等、公正、法治,这一价值追求回答了我们要建设什么样的社会的重大问题,反映了人们对美好社会的期望和憧憬,是(). [单选题] *A.衡量现代社会是否充满活力又和谐有序的重要标志(正确答案)B.判断社会性质的主要标志C.社会进步的根本内容D.衡量社会进步的根本尺度4、某顾吝在商场挑选商品时花了很长时间,仍然犹豫不决。
这时售货员可能有以下几种不同的说法,你认为最符合"服务群众"这一职业道德要求的是()。
[单选题] *"选好了没有?”"选好了吗?那边还有好多顾客等着呢!""需要帮忙吗?"(正确答案)“所有商品的质量都是一样的。
”5、全体公民必须遵循的基本行为准则,是维护公共生活秩序的重要条件。
全面依法治国需要人人遵纪守法,树立规则意识,增强法治观念。
体现的是社会公德的()[单选题] *A、文明礼貌B、助人为乐C、爱护公物D、遵纪守法(正确答案)6、关于遵纪守法,你认为正确的说法是()。
[单选题] *只要品德端正,学不学法无所谓金钱对人的诱感力要大于法纪对人的约束力法律是由人执行的,执行时不能不考虑人情和权力等因素遵纪守法与职业道德要求具有一致性(正确答案)7、【单选题】()是民族最闪亮的坐标。
[单选题] *A、英雄(正确答案)B、精神C、历史D、文化8、现行宪法规定,有权修改宪法的机关是()。
[单选题] *全国人民代表大会(正确答案)全国人大常委会全国人大及其常委会全国人大法律委员会9、在我国,司法机关是指国家()。
绝密☆启用并使用完毕前高考针对性训练英语试题本试卷共10页。
满分120分。
考试用时100分钟。
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考生信息条形码粘贴区。
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. 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。
第一部分阅读(共两节,满分50分)第一节(共15小题;每小题2. 5分,满分37. 5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。
AWelcome to the hands-down Big 5 game reserve in South Africa. V olunteering in our camp in the African bush is definitely a rewarding and convenient way to help you gain a sense of devotion and satisfaction with no extra material rewards.Why to joinIt's a once-in-a-lifetime experience, where you get to give back to the natural environment and the local community. It not only is an extremely satisfying feeling when you know that you've helped to protect this incredible part of the world for generations to come, but enables you to gain invaluable skills and knowledge in conservation.RequirementsPriority will be given to those candidates with great patience and devotion. Rich experience for wildlife conservation as well as a certificate in wildlife protection is not necessarily important. Refusal goes to animal abusers.What to expectWorking alongside trained forest protectors, conservation staff and other volunteers from Monday to Friday (8: 30 a. m. -4: 30 p. m. ) , you're expected to help with fence guards to keep animals safe from poachers (偷猎者) , feed animals, and even help catch animals for medical treatment. During term-time, you may also work with the local community, delivering meals with nutrition to local children.EntertainmentAfter work, you'll have plenty of time to relax on the reserve. Be bathed in the sun by the reserve's pool, play a few rounds of tennis or relax in the common room with your new friends. The program contains various overnight short-distance journeys in the surrounding areas such as Port Elizabeth, Jeffreys Bay and Grahamstown, where youcan go hiking, windsurfing, whale-watching, horse-riding and much more.1. What will participants acquire in the program?A. Survival skills in wilderness.B. Knowledge of wildlife protection.C. Certificates of animal conservation.D. Experience in community management.2. What should a volunteer do in the camp?A. Give food to animals.B. Keep animals in cages.C. Study diseases of animals.D. Train animals for research.3. What is an advantage of volunteering in the camp?A. Material rewards are plentiful.B. Accommodations are top-class.C. Flexible working hours are allowed.D. Recreational activities are provided.BOver 40 students with low vision study at a school in Gandhinagar, Gujarat. It was designed by Anand Sonecha, founder of an architecture company. Featuring a bright yellow entrance door, which stands out against the white walls, the school is decorated with a variety of sweet-smelling plants everywhere. Inside the classrooms, the walls feel smooth in contrast to the rough outside of the building. These all help students familiarize themselves with the area straightforwardly, without any trouble.The school provides an open space serving as a platform for the visually-challenged students to play, perform, or celebrate festivals and the students are easy to orient themselves according to the sound, smell, sight and touch. “The idea behind the design was to make the school more accessible to the students,” Sonecha says, “They come from remote villages and towns in Gujarat, and I am eager to help them.”During the construction, Sonecha used contrasting colors so that students could easily distinguish between the elements. Blue was used for all classroom doors, yellow for the entrance gate, black for switch buttons, and yellow and green for the furniture. All these colors contrasted with the white walls of the school, helping the students locate different elements. Different areas are of different height and width, which makes the sounds and noises change according to the echo (回音) produced in these spaces. Furthermore, he cooperated with fellow landscape architect Lokendra Balasaria to plant more than 1, 000 plants of 37 species. These sweet plants have been grown not only to lead the children to move in the school through smell but also to attract butterflies and birds, and provide shade.“The structure of the building is designed similarly to any other school building, only with a few clever elements. My intention was to avoid making it look distinct from other schools,” Sonecha explains, “I hope that there are no different schools for such students. Instead, all these elements should be added to public spaces for them. And my follow-up efforts may be there.”4. Why did Sonecha design the school in Gandhinagar?A. To explore architecture styles.B. To raise funds for his company.C. To offer convenience to the students.D. To improve students' learning ability.5. What does the underlined word “orient” in Paragraph 2 mean?A. Relax.B. Waken.C. Cheer.D. Direct.6. How does the school help students perform daily routine?A. By expanding activity areas.B. By stimulating multiple senses.C. By offering behavioral guidelines.D. By strengthening safety measures.7. What will Sonecha probably do in the future?A. Promote accessibility in the public regions.B. Modernize architecture with smart devices.C. Build special schools for disabled students.D. Decorate schools with traditional elements.CLanguage gives us the power to describe countless actions, properties and relations that compose our experiences, real or imagined. As for how languages were created, scientists found iconicity might play a key role. People can't bridge language gap and understand each other without iconicity. When playing a game of charades (猜字谜) , we act out our meaning, using our hands and bodies to describe the sizes and shapes of objects. The key to this process of forming new symbols is the use of iconicity. Not limited to gesturing, iconicity appears in our visual communication too. Traffic signs, food packaging, maps. . . wherever there are people communicating, you will find iconicity.According to our research, iconicity might also exist in our voices. We organized a contest in which we invited contestants to record a set of sounds to express different meanings. The winner of the contest was determined by how well listeners could guess the intended meanings of the sounds based on a set of written options. Critically, the sounds that contestants submitted couldn't include actual words or onomatopoeias (拟声词) .Listeners were remarkably good at interpreting the meanings of the sounds. Yet, all of the contestants and listeners were speakers of English. Thus, it was possible that listeners' success relied on some cultural knowledge that they shared with the speakers. Did the listeners also understand the speakers from completely different cultural backgrounds?Later, an Internet survey translated into 25 different languages was carried out. Participants listened to each sound from the English speakers and guessed the meaning by choosing from six written words. Guessing accuracy for the different groups ranged from 74 percent for English speakers to 34 percent for Portuguese speakers. It is far from perfect, but well above the chance rate of eight percent expected by us.Taken together, these studies show that our capacity for iconic communication has played a critical role. Without this special talent, language would likely never have gotten off the ground.8. Which of the following can explain “iconicity” ?A. A skill in foreign language learning.B. The process of acting out our meanings.C. The connection between form and meaning.D. A barrier between different language speakers.9. What can we know about the contest?A. It required sounds containing meanings.B. Its winners were creative in recordings.C. It aimed to prove iconicity in words.D. Its entries were familiar to listeners.10. What can be inferred from Paragraph 4?A. English pronunciations differ.B. The research has a limitation.C. The cultural gap is narrowing.D. Listening skills vary in cultures.11. What is the significance of the research?A. Clarifying the influence of sounds.B. Proving the necessity of exchanges.C. Uncovering the origin of languages.D. Identifying the function of gestures.DMany of us remember the feeling of having our braces (牙套) regularly adjusted and retightened at the dentist's. And interventions are based entirely upon the estimate of dentists and involve a great deal of trial and error, which can lead to too many visits to the dentist's.Professor Erleben and his team created a computer model that creates accurate 3D simulations (模拟) of an individual patient's jaw, which dentists can use to predict how sets of braces should be designed to best straighten a patient's teeth and plan the best possible treatment. To create these simulations, the computer model was used to map sets of human teeth after getting detailed CT images of teeth and the small, fine structures between the jawbone and the teeth. This type of precise digital simulation is referred to as a digital twin, a virtual model that lives in the cloud.The virtual model can answer what's happening in the real world, and do so instantly. For example, one can ask what would happen if you pushed on one tooth and get answers with regards to where it would move and how it would affect other teeth. The model also helps to predict the post treatment effect, achieve “visualization” of treatment, and facilitate patients to understand the plan of straightening their teeth. What's more, it has enabled more flexible and convenient digital medical follow-up services.The area of research that uses digital twins is relatively new. “However, we need to set up a sufficiently big database if digital twins are to really take root and benefit the healthcare industry,” Erleben said, “In the future, the virtual model can be used to plan, design and improve, and can therefore be used to operate companies, robots, factories and used much more in the energy, healthcare and other fields.”12. What is Paragraph 1 mainly about?A. The professional integrity of dentists.B. The current state of dental treatment.C. The procedure of retightening braces.D. The intervention of modern technology.13. Which was the first step in creating 3D simulations?A. Predicting treatment effect.B. Designing a computer model.C. Drawing the shape of a mouth.D. Obtaining the details of teeth.14. What is Professor Erleben's attitude towards digital twins?A. Doubtful.B. Curious.C. Favorable.D. Dismissive.15. What can be a suitable title for the text?A. Why digital twins make a hitB. Where virtual treatment goesC. What trouble dentists encounterD. How a virtual model aids dentists第二节(共5小题;每小题2. 5分,满分12. 5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。
人教版七年级历史与社会道德与法治针对性训练单元检测十一答案一、选择1、“政之所兴,在顺民心;政之所废,在逆氏心”强调民心问背对国家发展的重要性。
下列历史人物的结局与“政之所废,在逆民心”的观点相一致的是()①启②夏桀③商纣④盘庚⑤周厉王⑥周武王A.①③⑤B.②③⑤C.③⑤⑥D.②④⑥2、成语“乱七八糟”和两个历史事件有关,“乱七”和汉景帝时的“七国之乱”有关,而“八糟”和惠帝时的“八王之乱”有关。
“七国之乱”和“八王之乱”发生的朝代分别是()A.东汉、西晋B.西汉、西晋C.秦、东晋D.东周、西晋3、下列政权中,被农民起义推翻的是()A.秦B.西汉C.东汉4、.监察制度是君主专制中央集权制度的重要组成部分。
下列秦汉时期的官职中具有监察职能的是()①御史大夫②太尉③刺史④书博士⑤丞相A.①③B.①③④C.①③⑤D.②③④5、迁都洛阳后,北魏孝文帝亲自到鲁城(今山东曲阜)祭祀孔子,封孔氏后人为官,并让充州刺史修复孔子墓。
他这样做的主要目的是()A.统一黄河流域B.开发江南经济C.借机笼络汉人D.学习先进文化6、三国两晋南北朝时期,统一过黄河流域的政权有()①秦②魏③西晋④东晋⑤前秦⑥北魏A.①②③⑤B.①③④⑥C.②③④⑤D.②③⑤⑥1、人和动物的根本区别是()2、()人生活在北京周口店龙骨山山顶的洞穴里三、材料题材料一我们所知道的最早的考试制度,是中国所采用的选举制度,以及定期举行的考试一——《大英百科全书》材料二中国的这种科举制度“是世界各国中所用与选拔真才之最古最好的制度”——孙中山材料三:自古功德兼隆,由汉以来,未之有也。
——欧阳修《新唐书?太宗本纪》回答:(1)材料一提到的“中国所采用的选举制度”是指哪种制度?(2分)唐玄宗是如何完善这种制度的?(2分)(2)根据材料指出孙中山把这种制度称为“最古最好”制度的理由?(2分)(3)唐朝的用人制度对今天我国的教育有何启示?(2分)答案:一、选择1、B2、B3、A4、A5、D6、D二、填空1、会不会制造工具2、山顶洞人三、材料题(1)科举制唐玄宗时,诗赋成为进士科主要的考试内容.(2)因为科举制的创立改善了用人制度,促进了教育事业和文学艺术事业的发展。
因数与倍数针对性训练100题一、填空题。
1、根据和差的奇偶性填空奇数+奇数=(偶数)奇数-奇数=(偶数)奇数+偶数=(奇数)奇数-偶数=(奇数)偶数+偶数=(偶数)偶数-偶数=(偶数)2、根据积的奇偶性填空奇数×奇数=(奇数)奇数×偶数=(偶数)偶数×偶数=(偶数)3、两个数的和是18,这两个数可能都是(奇)数,也可能都是(偶)数。
4、两个数的积是24,这两个数可能都是(偶)数,也可能一个是(奇)数,另一个是(偶)数。
5、任何一个奇数减去1后,差都是(偶)数。
6、两个质数的和是12,这两个数分别是( 5 )和(7 )。
两个质数的和是91,这两个质数分别是( 2和89)。
7、1+2+3+......+1993的和是(奇数)(填“奇数”或者“偶数”)8、一个数分别与另外两个相邻的奇数相乘,所得到的两个积相差150,这个数是(75)。
9、一盏灯开始的时候是亮着的,小红按开关按了9次,这时候的灯是(灭)着的(填“亮“或”灭“)。
10、从199起,连续写5个奇数(199,201,203,205,307 ),从388起,连续写5个偶数(388,390,392,394,396 )11、从1到100这100个数中,共有( 50 )个偶数,( 50 )个奇数。
12、动手翻一翻。
①拿一枚硬币正面朝上放在桌上,翻动1次,正面朝( 下 ):翻动2次,正面朝(上)。
②翻动6次,正面朝( 上 ):翻动19次,正面朝(下)。
③翻动奇数次,正面朝( 下 ):翻动偶数次正面朝(上)。
13、2A+7B=120,A 和 B都是自然数,那么B一定是(偶)数。
14、已知a b c中一个是7,一个是8,一个是9,则(a-3)×(b-4)×(c-5)的结果一定是(偶数)。
(填奇数或偶数)15、如果有两个质数的和等于24,可以是( 5 )+(19 ),(7)+(17)或(11 )+(13 )。
hlj浙教版七下语文针对性训练答案1、成语完形:星()如雨[单选题] *陨(正确答案)空宇星2、1荀子《劝学》中“吾尝终日而思矣,不如须臾之所学也”强调了整天空想不如片刻学习收获大的道理。
[判断题] *对错(正确答案)3、下列词语中,加着重号字的注音正确的一项是()[单选题] *A、外甥(shēn)窘迫(jiǒng)刮痧(shā)秩序(zhì)B、筹划(chóu)供给(gěi)家谱(pǔ)惦记(diàn)C、蛮横(hèng)拥挤不堪(kān)发愣(lèng)济南(jǐ)(正确答案)D、私塾(shú)廿三(niàn)丧事(sāng)撮土(chuō)4、1《我的空中楼阁》中写道:往返于快乐与幸福之间,哪儿还有不好走的路呢?这句话是说小屋不仅仅是物,还是作者理想境界的化身,是作者快乐与幸福的源泉,寄托了作者热爱自己的小屋,热爱自由快乐的生活,保持独立的人格的思想感情。
[判断题] *对(正确答案)错5、下列词语中,加着重号字的注音正确的一项是()[单选题] *A、处分(chù)称职(chèng)B、占卜(pú) 瑰丽(guēi)C、逡巡(qún) 账簿(bó)D、蜷曲(quán) 妯娌(zhóu)(正确答案)6、1向非专业人士介绍工艺流程时应尽量使用专用术语,以使他们学到更多的专业知识。
[判断题] *对错(正确答案)7、1希望别人原谅自己,可以说“请原谅”,也可以说“请包涵”。
[判断题] *对错(正确答案)8、30. 下列句子中加双引号的成语使用正确的一项是()[单选题] *A.他恃着自己成绩优异,“目空一切”,每每不把人放在眼里,因而在班级中总是交不到知心的朋友。
(正确答案)B.大蒜、白糖、苹果等大幅涨价,疯狂的速度令人“叹为观止”,由此也催生出“蒜你狠”“糖高宗”“什么”等一系列网络新词。
2022浙教版八年级数学(下)《针对性训练》单元检测(二)1.(3分)等于() [单选题] *A.±4B.4(正确答案)﹣4D.±22.(3分)函数y=中,自变量x的取值范围是() [单选题] *A.x>﹣3B.x≥﹣3(正确答案)C.x≠﹣3D.x≤﹣33.(3分)一次函数y=﹣2x+1的图象不经过下列哪个象限() [单选题] * A.第一象限B.第二象限C.第三象限(正确答案)D.第四象限4.(3分)下列计算正确的是() [单选题] *A.B.(正确答案)C.4D.35.(3分)如图,矩形ABCD中,对角线AC,BD交于点O.若∠AOB=60°,BD=8,则AB的长为() [单选题] *A.4(正确答案)C.3D.56.(3分)如图,已知四边形ABCD是平行四边形,下列结论中不正确的是(D) [单选题]A.当AC=BD时,它是矩形B.当AC⊥BD时,它是菱形C.当AD=DC时,它是菱形D.当∠ABC=90°时,它是正方形(正确答案)7.(3分)如图,正方形ABCD中,AE垂直于BE,且AE=3,BE=4,则阴影部分的面积是() [单选题]A.16B.18C.19(正确答案)D.218.(3分)已知P1(﹣3,y1),P2(2,y2)是一次函数y=﹣x﹣1的图象上的两个点,则y1,y2的大小关系是() [单选题] *A .y1=y2B.y1<y2C.y1>y2(正确答案)D.不能确定9.(3分)2022年将在北京﹣张家口举办冬季奥运会,很多学校开设了相关的课程.如表记录了某校4名同学短道速滑选拔赛成绩的平均数与方差s2:队员1 队员2 队员3 队员4平均数(秒) 51 50 51 50方差s2(秒2) 3.5 3.5 14.5 15.5根据表中数据,要从中选择一名成绩好又发挥稳定的运动员参加比赛,应该选择() [单选题] *A.队员1B.队员2(正确答案)C.队员3D.队员410.(3分)如图,函数y=2x和y=ax+4的图象相交于点A(m,3),则不等式2x≥ax+4的解集为() [单选题] *A. x≥3/2(正确答案)B.x≤3C. x≤3/2D.x≥311.(3分)如图坐标系,四边形ABCD是菱形,顶点A、B在x轴上,AB=5,点C在第一象限,且菱形ABCD的面积为20,A坐标为(﹣2,0),则顶点C的坐标为()[单选题] *A (4,3 )B (5,4 )C (6,4 )(正确答案)D. (7,3 )12.(3分)如图,直线y=x+4与x轴、y轴分别交于点A和点B,点C、D分别为线段AB、OB的中点,点P为OA上一动点,当PC+PD最小时,点P的坐标为() [单选题] *A (﹣3,0)B (﹣6,0)C (﹣3/2,0)(正确答案)D.(﹣5/2,0)13.正方形的对角线长为4,则它的边长为. [填空题] *_________________________________(答案:2√2)14.(3分)将直线y=2x﹣1向上平移4个单位,得到直线. [填空题] *_________________________________(答案:y=2x+3)15.(3分)在弹性限度内,弹簧的长度y是所挂物体质量x的一次函数,当所挂物体的质量分别为1kg和3kg时,弹簧长度分别为15cm和16cm,当所挂物体的质量为4kg时弹簧长厘米? [填空题] *_________________________________(答案:16.5)16.(3分)如图,EF为△ABC的中位线,BD平分∠ABC,交EF于D,AB=8,BC=12,则DF的长为.[填空题] *_________________________________(答案:2)17.(3分)如图,矩形OABC的边OA、OC分别在x轴、y轴上,点B的坐标为(3,2).点D、E分别在AB、BC边上,BD=BE=1.沿直线DE将△BDE翻折,点B落在点B′处.则点B′的坐标为.[填空题] *_________________________________(答案:(2,1))19.(4分)计算:√18-2/√2-√8/2+(√5+1) [填空题] *_________________________________(答案:3√2+1)(2)(√a+√b)²-(√a-√b)² [填空题] *_________________________________(答案:4√ab)20.(8分)如图,正比例函数y=2x的图象与一次函数y=kx+b的图象交于点A(m,2),一次函数图象经过点B(﹣2,﹣1),与y轴的交点为C,与x轴的交点为D.(1)求一次函数解析式; [填空题] *_________________________________(答案:y=x+1)(2)求C点的坐标; [填空题] *_________________________________(答案:(0,1))(3)求△AOD的面积. [填空题] *_________________________________(答案:1)21(8分)如图,O是矩形ABCD的对角线AC的中点,M是AD的中点,若AB=5,AD=12,求四边形ABOM的周长. [填空题] *_________________________________(答案:20)22.(8分)小李从甲地前往乙地,到达乙地休息了半个小时后,又按原路返回甲地,他与甲地的距离y(千米)和所用的时间x (小时)之间的函数关系如图所示.(1)小李从乙地返回甲地用了多少小时?[填空题] *_________________________________(答案:4)(2)求小李出发5小时后距离甲地多远? [填空题] *_________________________________(答案:150km)23.(8分)如图,在直角梯形ABCD中,AD∥BC,∠B =90°,AG∥CD交BC于点G,点E、F分别为AG、CD的中点,连接DE、FG.(1)求证:四边形DEGF是平行四边形; [填空题] *_________________________________(答案:(1)因为AD//BC,AG//CD,所以四边形AGCD是平行四边形,所以AG=CD,因为点E、F分别为AG 、CD的中点,所以GE=1/2AG=1/2CD=DF,又因为 AG//CD,所以四边形DEGF是平行四边形)(2)当点G是BC的中点时,求证:四边形DEGF是菱形. [填空题] *_________________________________(答案:(2)如图所示,连接BE,因为点G是BC 的中点, 所以BG=CG,因为点E、F分别为AG、CD的中点,所以GE=1/2AG=1/2CD=CF,因为AG//CD,所以∠AGB=∠DCG·在△EBG和△FGC中, GE=CF ,∠EGB=∠FCG BG=GC,所以△EBG≌△FGC(SAS),所以 BE=GF·因为∠B=90所以△ABG是直角三角形,因为点E为AG的中点,所以EG=BE=GF,由 (1)可知四边形DEGP是平行四边形,所以四边形 DEGF是菱形。
针对性训练1.精子的形态特征是 ( )A.形状似蝌蚪,不能游动B.呈球形,不能自由运动C.呈蝌蚪形,有长尾,能游动D.呈球形,能自由游动2.下列有关哺乳动物卵子形成的说法正确的是 ( )A.卵原细胞通过减数分裂形成初级卵母细胞B.初级卵母细胞的形成是性成熟以后进行的C.初级卵母细胞经减数分裂形成成熟卵子的过程都是在卵巢内完成的D.排卵是指卵泡从卵巢中排出的过程3.精子和卵子发生的过程中的说法不正确的是 ( )A.精子的发生是在睾丸内完成的,卵子的发生是在卵巢内进行的B.精子细胞形成精子的过程中需要变形C.哺乳动物卵泡的形成和在卵巢内的储备,是在胎儿期完成的D.1个卵泡中能形成4个成熟的卵子4.观察卵子是否受精的重要标志是 ( )A.卵黄膜和透明带之间出现两个极体B.精卵相遇,发生顶体反应C.精子接触透明带D.雌、雄原核形成5.标志着受精作用完成的是 ( )A.释放第二极体B.雌、雄原核形成C.两原核融合形成合子D.第一次卵裂6.精细胞变形形成精子的说法正确的是 ( )A.线粒体聚集形成顶体,以便能量供应B.中心体浓缩成原生质滴C.细胞核变成精子头的主要部分D.高尔基体演变成尾7.关于的动物自然排卵叙述正确的是 ( )A.排卵是指卵子从卵泡中排出B.精子与卵子受精后发生排卵C.排卵时已完成减数分裂,因此,排出的卵子仅含体细胞一半的遗传物质D.排卵后进入输卵管,准备与精子受精8.下列属于精子、卵子发生上的区别的是 ( )A.细胞的分裂方式B.细胞遗传物质的变化C.成熟细胞的染色体数量D.卵泡的形成和在卵巢内的储备是在出生前(胎儿时期)完成9.关于精子变形的叙述错误的是 ( )A.细胞核变为精子头部的主要部分B.高尔基体发育为头部的顶体C.中心体演变为精子的尾D.线粒体退化消失10.精原细胞增殖的方式是()A.无丝分裂B.有丝分裂C.减数分裂D.有丝分裂和减数分裂11.雄性个体能产生精子的阶段是()A.初生到成年B.初情期开始到个体衰老C.从初情期开始,直到生殖机能衰退D.从胚胎开始直到生殖器官的成熟12.精子变形时,线粒体集中在尾基部的原因解释是()A.释放顶体酶发生透明带反应B.产生能量促进精子运动C.有利于质基因进入受精卵D.受细胞核的挤压形成13.初级卵母细胞的减数第一次分裂完成于()A.排卵前后,在卵巢内 B. 受精前,在卵巢内C. 排卵前后,在输卵管D. 受精时,在输卵管内14.次级卵母细胞的第二次成熟分裂完成于()A.排卵前,在卵巢内 B. 受精前,在输卵管内C. 排卵后,在腹腔内D. 受精时,在输卵管内15.关于成熟精子的叙述正确的是 ( )A.不同种动物精子的形态不同B.不同种动物精子的大小差别很大C.动物的体型大小与精子的大小无关D.体型较大的动物的精子较大16、据科学家研究证实,由精细胞变性为精子的过程中,细胞核变为精子的头部,部分细胞质变为精子的颈部和尾部,大部分细胞质及多数细胞器被丢弃,但全部的线粒体被保留下来,并集中在颈部。
绝密★启用并使用完毕前2021年5月高考针对性训练物理试题注意事项:1.答题前,考生先将自己的姓名、考生号、座号填写在相应位置,认真核对条形码上的姓名、考生号和座号,并将条形码粘贴在指定位置上。
2.选择题答案必须用2B铅笔正确填涂,非选择题答案必须用0.5毫米黑色签字笔书写,字体工整、笔迹清楚。
3.请按照题号在给定题目的答题区域内作答,超出答题区域书写的答案无效;在草稿纸试题卷上答题无效。
保持卡面清洁、不折叠、不破损。
一、单项选择题:本题共8小题,每小题3分,共24分。
在每小题给出的4个选项中,只有一项是符合题目要求的1.泉城济南,以泉闻名。
小张同学在济南七十二名泉之一的珍珠泉游览时,发现清澈幽深的泉池底部,不断有气泡生成,上升至水面破裂。
气泡在泉水中上升过程中,以下判断正确的是A.气泡对泉水做正功,气泡吸收热量B.气泡对泉水做正功,气泡放出热量C.泉水对气泡做正功,气泡吸收热量D.泉水对气泡做正功,气泡放出热量2.蹦床运动有益于人的身心,成人和儿童都可以参与,在社会上迅速流行起来。
一人在蹦床上运动时,某段时间内的v~t图像如图所示,其中0~t1段和t3~t4段是直线,且0~t1时间大于t3~t4的时间,不计空气阻力。
由此图像可知A.0~t1时间内人向上运动B.t1~t3时间内人一直向下运动C.t2时刻的加速度大于重力加速度gD.t3时刻的加速度大于重力加速度g3.如图所示为远距离输电的示意图,已知交流电源电压为U,升压变压器的原副线圈匝数比为1:m,降压变压器的原副线圈匝数比为n:1,负载R正常工作。
现输电距离增大,输电线电阻随之增大,若要保证负载仍能正常工作,只改变选项中的一个量,下列做法可行的是A.增大mB.减小mC.减小nD.减小U4.如图所示,在光滑的水平面上有一半径r=10cm、电阻R=1Ω的金属圆环,以某一速度进入有界匀强磁场。
匀强磁场方向垂直于纸面向里,磁感应强度B=0.5T,从圆环刚进入磁场开始,到刚好有一半进入磁场时,圆环一共产生了32J的热量,此时圆环速度为6m/s,下列说法正确的是A.此时圆环中的电流方向为顺时针B.圆环进入磁场的全过程产生的热量为64JC.此时圆环中的电动势为0.6VD.圆环进入磁场的全过程通过圆环某截面的电量为0.01C5.处于基态的一群氢原子被一束单色光照射后,最多能发出6种频率的光,氢原子的能级图如图所示。