限时练习1
【练习】2021届高三英语下学期限时训练一有详解
高三英语限时训练一总分65分第一部分:阅读理解(共两节,满分30分)第一节(共7个小题:每小题2.5分,满分17.5分)AWhat do the random, scribbled(潦草的)drawings crowding the margins(页边空白)of most high school students’ papers mean? When a student is caught doodling(乱画)in class, he will probably be criticized for daydreaming. But doodling while listening can help with remembering details, rather than implying that the mind is wandering, according to a study published in the scientific journal Applied Cognitive Psychology.In an experiment conducted b y the Medical Research Council’s Cognition and Brain Sciences Unit in Cambridge,40 subjects were asked to listen to a two-minute tape giving several names of people and places. Half of the participants were asked to shade in shapes on a piece of paper at the same time, without paying attention to neatness, while the rest were given no such instructions. After the tape had finished, all participants in the study were asked to recall the names of people and places. The doodlers recalled on average 7.5 names of people and places, compared to only 5.8 by the non-doodlers.“If someone is doing a boring task, like listening to a dull telephone conversation, they may start to daydream.” said study researcher, Professor Jackie Andrade, of the School of Psychology, U niversity of Plymouth. “Daydreaming distracts them from the task, resulting in poorer performance. A simple task, like doodling, may be enough tostop daydreaming without affecting performance on the main task.”“In psychology, tests of memory or attention will often use a second task to selectively block a particular mental process. If that process is important for the main task, then performance will be weakened. But my research suggests that in everyday life doodling may be something we do because it helps to keep us on track with a boring task, rather than being an unnecessary distraction(分心)that we should try to resist doing.” said Andrade.Dan Ware, a social study teacher, used to consider doodling a distraction from learning, but after teaching kids with all personality types he learned scribbling away during lectures helps certain students remember more information. “In my first few years of teaching, I thought, ‘Well, this kid isn’t paying attention. He’s daydreaming.’ But I had some really powerful experiences with students and came to understand in many cases that was their way of focusing, and those students were probably paying more attention than other students.” Ware said.1. What do we know about the participants involved in the experiment?A. Some were asked to note down the information neatly.B. Some were asked to memorize the names they would hear.C. Some were instructed to listen to the tape with full attention.D. Some were instructed to make random drawings on paper.2. Which of the following will both Jackie Andrade and Dan Ware agree with?A. Doodling helps some people focus.B. Doodling makes a dull task interesting.C. Students who doodle perform poorly.D. Students who doodle lack concentration.3. What is the best title of the text?A. Daydreaming Can Sharpen Study SkillsB. Doodling Can Help Memory RecallC. A Wandering Mind Improves ProductivityD. Distractions Harm Academic PerformanceBShyness is the cause of much unhappiness for a great many people. Shy people are anxious and self-conscious; that is, they are concerned about their own appearance and actions too much. Negative thoughts are constantly occurring in their minds: What kind of impression am I making? Do they like me? Do I sound stupid? Am I wearing unattractive clothes?It is obvious that such uncomfortable feelings must affect people unfavorably. A person’s self-concept is reflected in the way he or she behaves and the way a person behaves affects other people’s reactions. In general, the way people think about themselves has a deep effect on all areas of their lives.Shy people, who have low respect, are likely to be passive and easily influenced by others. They need faith that they are doing "the right thing". Shy people are very sensitive to criticism. It makes them feel inferior(自卑). They also find it difficult to be pleased by praises because they believe they are unworthy of praise. A shy person may respond to a praise with a statement like this one: "You’re just saying that to make me feel good. I kn ow it’s not true."It is clear that, while self-awareness is a healthy quality, overdoing it is harmful.Can shyness be completely got rid of, or at least reduced? Fortunately, people can overcome shyness with determination since shyness goes hand in hand with lack ofself-respect. It is important for people to accept their weaknesses as well as their strengths. Each one of us has his or her own characteristics. We are interested in our own personal ways. The better we understand ourselves, the easier it becomes to live up to our chances for a rich and successful life.4. The first paragraph is mainly about ____________. .A. the cause of shynessB. the effect of shyness on peopleC. the feelings of shy peopleD. the questions in the minds of shy people5. According to the writer, self-awareness is ____________.A. harmful to peopleB. a weak point of peopleC. the cause of unhappinessD. a good characteristic6. What is the shy people’s reaction to praise?A. They are pleased by it. B They feel it is not true.C. They are very sensitive to it.D. They feel they are worthy of it.7. We can learn from the passage that shyness ____________.A. blocks our chances for a successful lifeB. helps us to live up to our full developmentC. enables us to understand ourselves betterD. has nothing to do with lack of self-respect第二节七选五(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,选项中有两项为多余选项。
小学一年级数学练习题延时作业
小学一年级数学练习题延时作业在小学一年级数学学习中,练习题是巩固知识和提高技能的重要环节。
然而,有些孩子可能在课堂上没有足够的时间完成习题,或者需要更多的时间来加深理解。
为了帮助这些孩子,我们设计了延时作业,让他们有更多的时间来完成练习题。
延时作业是指将练习题从课堂上带回家,给予学生更长的完成时间。
通过延时作业,孩子们可以反复思考和尝试,提高解题能力和思维灵活性。
下面是一些适合小学一年级学生的数学练习题延时作业:1. 加法和减法练习题1) 12 + 5 =2) 8 - 3 =3) 17 + 9 =4) 25 - 12 =2. 数字顺序练习题1) 从小到大排列:7、3、9、12) 从大到小排列:12、6、10、43. 形状辨认练习题1) 将下面的图形命名:□ ⚪△ ○2) 判断下面的问题是否正确:○ 是一个圆形。
△是一个四边形。
4. 比较大小练习题1) 7 _ 52) 3 _ 93) 12 _ 8通过延时作业,孩子们可以在家中更加专注地解题,不受时间限制。
思考题目时,他们可以多次尝试,找到正确答案。
这种方式激发了孩子们对数学的兴趣,培养了他们的解决问题的能力。
此外,延时作业还可以让家长更好地了解孩子的学习进展和困难点。
当孩子们在完成练习题时遇到困难,家长可以提供指导和帮助,帮助孩子理解和解决问题。
这种家庭互动有助于巩固学校和家庭的教育合作,促进孩子们的全面发展。
为了确保延时作业的有效性,家长和老师都需要密切配合。
家长应该为孩子规定一个适当的完成时间,并提供必要的辅导和支持。
老师则应该及时回收作业,及时反馈学生的表现并指导他们改正错误。
通过家校合作,可以实现延时作业的最大效益。
总之,小学一年级的数学练习题延时作业是提高学生数学能力和解题思维的有效方式。
通过给予孩子更多的时间来完成作业,鼓励他们多次尝试和思考。
延时作业不仅可以提高学习效果,还可以促进家校合作,为孩子的全面发展奠定基础。
2023中考语文一轮复习:字音字形限时练习(含答案)
2023中考语文一轮复习:字音字形限时练习(含答案) 2023中考语文一轮复习字音字形限时练习一、字音练习(每题2分,共40分,时间:15分钟)1.下列各组词语中,加点字的读音全都正确的一组是()A.虚妄(wǎng)锃亮(zēng)侍立(shì)____________ 相得益彰(zhāng)B.拮据(jié)中伤(zhòng)侥幸(jiǎo)____________ 间不容发(fǎ)C.譬如(pì)____________教诲(huì)____________嗔怪(chēn)____________铮铮作响(zhēng)D.岔气(chà)纨绔(kuà)机械(jiè)____________ 锲而不舍(qiè)2.下列各组词语中,加点字的读音全都正确的一组是()A.争讼(sòng)两栖(xī)缄默(jiān)天衣无缝(fèng)B.行辈(háng)冗杂(rǒng)斡旋(wò)目空一切(kōng)C.欺侮(wǔ)____________烘烤(hōng)追溯(shù)草长莺飞(yīng)D.褶皱(zhé)晦暗(huì)怅惘(wǎng)销声匿迹(nì)3.下列加点字注音有错误的一项是()A.归省(xǐnɡ)蓦然(mò)撺掇(duo)豁然开朗(huò)B.白羊肚(dǔ)眼眶(kuàng)斡旋(wò)屋舍俨然(yǎn)C.窈窕(yǎo tiǎo)翕忽(xī)为坻(chí)悄怆幽邃(qiǎo)D.照例(liè)____________糁之(sǎn)溯洄(sù)俶尔远逝(shū)4.下列各组词语中,加点字的读音全都正确的一组是()A.凛冽(lǐn)蔚蓝(wèi)修葺(qì)仙露琼浆(qióng)B.迸溅(bèng)吟唱(yíng)幼稚(zhì)海市蜃楼(shèn)C.堡垒(lěi)嗥鸣(háo)秩序(zhì)祸不单行(háng)D.监督(dū)累赘(léi)山涧(jiān)心有灵犀(xī)5.下列各组词语中,加点字的读音全都正确的一组是()A.怯懦(qiè)宽宥(yòu)____________ 狡黠(xiá)____________ 战战兢兢(jīng)B.拜谒(è)诡谲(jué)____________ 掺杂(cān)____________不省人事(xǐng)C.箴言(zhēng)烟囱(cōng)____________飞窜(chuàn)____________ 血雨腥风(xiě)D.瞥见(biē)冠冕(guān)____________ 睥睨(nǐ)____________ 抽丝剥茧(bō)6.下列加点字注音正确的一项是()A.剖(pāo)析漩(xuán)涡卑鄙(bǐ)惟妙惟肖(xiào)B.胆怯(qiè)默契(qì)襁(qiǎng)褓血(xu è)气方刚C.迸(bìng)溅侍(shì)候两栖(xī)混(h ùn)为一谈D.给(jǐ)予脑髓(suǐ)炽(zhì)热间不容发(fā)7.下列词语中加点字注音完全正确的是()A.簇新(zù)盘桓(huán)容臭(chòu)伤痕累累(lěi )B.桑梓(z )荤菜(hūn)韩傀(guī)____________裘葛之遗(wèi)C.麾下(huī)间或(jiàn)修祲(qìn)不屑置辩(xuè)D.的卢(dí)绮绣(qí)____________缟素(gǎo)浑身解数(xiè)8.下列各组词语中,加点字的读音全都正确的一组是()A.推搡(sāng)堕落(duò)腐蚀(shí)安营扎寨(zhài)B.敦实(dūn)彷徨(páng)驰骋(chěn)震耳欲聋(zhèn)C.棱角(léng)卑鄙(bǐ)蠕动(rú)相辅相成(fǔ)D.缭绕(liáo)迂回(yū)两栖(xī)接踵而至(zhǒng)9.下列各组词语中,加点字的读音全都正确的一组是()A.烘托(hōng)贮藏(ch )静谧(mì)小心翼翼(yì)B.流转(zhuàn)悔恨(hu )笃定(d )疲惫不堪(kān)C.中伤(zhōng)莅临(1ì)____________沐浴(mù)漠不关心(mó)D.坍塌(tān)愚蠢(ch n)徘徊(huái)刨根问底(páo)10.下列各组词语中,加点字的读音全都正确的一组是()A.蒙胧(lóng)修葺(qì)胸脯(pú)海市蜃楼(shèng)B.鲁莽(mǎng)契约(qì)晌午(shǎng)酣然入梦(hān)C.露宿(lù)憎恶(è)嗥鸣(háo)血气方刚(xuè)D.模拟(nǐ)颤抖(chàn)侮辱(wǔ)气冲斗牛(dòu)11.下列各组词语中,加点字注音全都正确的一组()A.嗥鸣(háo)迭起(dié)澎湃(bài)义愤填膺(yīng)B.彷徨(páng)花圃(pǔ)深邃(suì)迥乎不同(jiǒng)C.凹凼(dàng)涎水(yán)徘徊(huái)烟雾缭绕(rào)D.校注(xiào)弄堂(nóng)倔强(jué)潜移默化(qián)12.下列各组词语中,加点字的读音全都正确的一组是()A.干预(gān)褶皱(zhě)腐蚀(shì)安营扎寨(zhài)B.翌日(yì)蜿蜒(wān)彷徨(páng)震耳欲聋(zhèng)C.棱角(léng)奠定(diàn)蠕动(rú)接踵而至(zhǒng)D.缅怀(miǎn)绚丽(xùn)迂回(yū)挑拨离间(jiān)13.下列各组词语中,加点字的读音全都正确的一组是()A.凛冽(lǐng)点缀(zhuì)秩序(zhì)血气方刚(xuè)B.堡垒(lěi)轮廓(kuò)憎恶(zēng)悲天悯人(mǐn)C.哺育(bǔ)譬如(bì)颤抖(chàn)忧心忡忡(chōng)D.炽热(chì)迸溅(bèng)嗥鸣(gāo)忍俊不禁(jīn)14.下列各组词语中,加点字的读音全都正确的一组是()A.苍劲(jìn)堕落(duò)缅怀(miǎn)安营扎寨(zhài)B.缭绕(liáo)敦实(dūn)彷徨(páng)震耳欲聋(zhèn)C.棱角(léng)卑鄙(bì)蠕动(rú)相辅相成(fǔ)D.迂回(yū)腐蚀(shí)翌日(lì)接踵而至(zh ǒng)15.下列各组词语中,加点字的读音全都正确的一组是()A.晦暗(huì)争讼(sòng)砂砾(lì)戛然而止(jiá)B.冗杂(chén)斡旋(wò)行辈(háng)目空一切(kōng)C.欺侮(wǔ)闭塞(sè)追溯(shù)草长莺飞(yīng)D.怅惘(wǎng)缄默(jiǎn)偏僻(pì)天衣无缝(fèng)16.下列各组词语中,加点字的读音全都正确的一组是()A.拘泥(ní)狩猎(shòu)莅临(wèi)不省人事(xǐng)B.慷慨(kǎi)两栖(xī)忏悔(chàn)信手拈来(zhān)C.诘问(jié)忧戚(qì)绰号(chuò)味同嚼蜡(jiáo)D.称职(chèn)悄然(qiǎo)别扭(biè)戛然而止(jiá)17.下列各组词语中,加点字的读音全都正确的一组是()A.过瘾(yǐn)哺育(bǔ)土匪(fěi)锲而不舍(qì)B.震悚(sǒng)校对(xiào)霹雳(lì)苛捐杂税(kē)C.取缔(dì)澎湃(pài)调羹(gēng)酣然入梦(hān)D.污秽(huì)咀嚼(jiáo)晌午(xiǎng)心不在焉(yān)18.下列各组词语中,加点字的读音全都正确的一组是()A.醒悟(xǐng)缠绕(rào)书斋(zhaī)锋芒毕露(lòu)B.门框(kuàng)诘问(jié)____________震悚(sǒng)苛捐杂税(kē)C.烦琐(suǒ)坚韧(rěn)门槛(kǎn)目不窥园(kuī)D.辫子(biàn)愧怍(zuò)田垄(lǒng)深恶痛绝(è)19.下列各组词语中,加点字的读音全都正确的一组是()A.矗立(chù)____________ 驰骋(chěn)____________ 干预(gān)____________ 相辅相成(fǔ)B.缄默(jān)____________ 襁褓(qiǎng)____________ 妩媚(fǔ)____________ 接踵而至(zhǒng)C.敦实(dūn)____________ 卑鄙(bǐ)____________ 陨石(y ǔn)____________ 怒不可遏(è)D.旷野(kuàng)____________ 漩涡(xuàn)____________ 腐蚀(shí)____________ 挑拨离间(jàn)20.下列各组词语中,加点字的读音完全正确的一组是()A.婆娑(suō)颓唐(tuí)主宰(zǎi)倔强挺立(juè)B.开垦(kěn)倦怠(dài)虬枝(qú)潜滋暗长(qián)C.锤炼(chuí)秀颀(qí)外壳(qiào)恹恹欲睡(yàn)D.毡子(zhān)镌刻(juān)精髓(suǐ)坦荡如砥(dǐ)二、字形练习(每题2分,共40分,时间:15分钟)21.下列词语中没有错别字的一项()A.翻来覆去锋芒必露振聋发聩人情世故B.神采弈弈妇孺皆知重峦叠嶂无缘无故C.哗众取宠油光可签混为一谈眼花缭乱D.怪诞不经诲人不倦杳无消息自惭形秽22.下列各组词语中,汉字书写全都正确的一组是()A.脏物恪守不知所措震奋人心B.旁骛琅琊一代天娇置之不理C.祥和殷红不可明状前赴后继D.规矩诓骗腐草为萤郑重其事23.下列各组词语中,汉字书写全都正确的一组是()A.家眷羁拌枯燥海枯石烂B.携带辐射静穆人情事故C.怠慢雾蔼褪色叹为观止D.脑畔孕育致密周而复始24.下列词语中没有错别字的一项是()A.销声匿迹嘎然而止叹为观止B.海枯石滥垂珠联珑风雪载途C.目空一切张灯结彩草长莺飞D.周而复始人情事故大彻大悟25.下列各组词语中,汉字书写全都正确的一组是()A.轮廓赤裸澎湃悲天闵人B.蔚蓝晌午魂魄酣然入梦C.毡鞋茉莉闲睱鲜为人知D.愧作伴侣挚友不期而至26.下列各组词语中,汉字书写全都正确的一组是()A.蛾眉熏淘胃同嚼蜡经世奇才B.喷薄伶俐不屑置辩雕梁画栋C.聒燥侦缉根深蒂固型销骨立D.统筹惦纪忸怩做态如坐针沾27.下列各组词语中,汉字书写全都正确的一组是()A.建壮抖擞质朴呼朋引伴B.诀别极端叮嘱疲惫不堪C.寂寞勋章娇媚无异思千D.狡猾爱幕虚荣麻木不仁28.下列各组词语中,汉字书写全都正确的一组是()A.蔚蓝妥帖坚韧五脏六腑B.取谛荒僻震悚心有灵犀C.幽寂稠密污秽仙露琼桨D.猥锁迸溅累赘悲天悯人29.下列各组词语中,汉字书写全都正确的一组是()A.稠密____________幼稚____________烦燥____________五脏六腑B.猥琐____________拖沓____________累赘____________语无轮次C.草率____________循环____________取缔____________苛捐杂税D.迟钝____________陡俏____________丰饶____________天涯海角30.下列各组词语中,汉字书写全都正确的一组是()A.孕育致密羁拌大彻大悟B.皎诘辐射枯燥周而复始C.怠慢眼框褶皱人情世故D.脑畔家眷褪色海枯石烂31.下列各组词语中,汉字书写全都正确的一组是()A.茏罩统筹根深蒂固消声匿迹B.云霄震撼正襟危坐富丽堂皇C.安祥濡养坦荡如底浮光掠影D.嬉闹推崇见异思迁郑重其是32.下列各组词语中,汉字书写全都正确的一组是()A.主宰倦怠遐想纵横绝荡B.奔弛序幕古朴旁逸斜出C.国殇绯红倾听震聋发聩D.轩昂沥青狼藉任劳任愿33.下列各组词语中,汉字书写全都正确的一组是()A.茄锁____________ 缅怀____________ 褶皱____________ 目眩神迷B.缭绕____________ 沙砾____________ 悬姝____________ 阳奉阴违C.演绎____________ 弥漫____________ 静穆____________ 格物置知D.衰竭____________ 告诫____________ 羁绊____________ 分崩离析34.下列词语中,没有错别字的一项是()A.鲁钝誊写毛骨悚然李代桃疆B.糟蹋聒燥如雷贯耳樯倾楫摧C.恣睢撺掇纷至踏来鸠占鹊巢D.秀颀荼毒与日俱增坦荡如砥35.下列语句书写正确的一项是()A.知识愈浅薄的人,愈想夸夸其谈;相反知识丰富倒使人在判断某些事物时,变得非常忧柔寡断。
人教版三年级数学上册第一单元第3课时《练习一》课后练习题(附答案)
人教版三年级数学上册第一单元
第3课时《练习一》课后练习题(附答案)
1.下面是阳阳下午放学回家后时间安排情况。
(1)爸爸5:15下班,从单位走回家需要45分钟,他在吃晚饭前()分钟到家。
(2)阳阳家吃晚饭用了25分钟,他们是()时()分吃完晚饭的。
(3)读书时,爸爸和妈妈陪阳阳一起阅读了40分钟,请你在下面的时间轴上用“↓”表示出他们开始阅读的时刻。
2.某旅游景点循环巴士运营时间如下表,每隔30分钟发一次车。
该巴士一天一共发了多少次车?
参考答案
1.(1)5 (2)6 30 (3)
2.(11:20-9:00)÷30分=5(次)(4:20-2:00)÷30分=5(次)5+5=10(次)
答:该巴士一天一共发了10次车。
能量变化试题
限时练习1(时间:30min)一、选择题1.已知H-H键能为436 KJ/mol,N-H键能为391KJ/mol,根据化学方程式:N2 (g)+ 3H2(g)= 2NH3 (g)ΔH=-92.4 KJ/mol,则N≡N键的键能是( )A.431 KJ/mol B.946 KJ/mol C.649 KJ/mol D.869 KJ/mol2.氨分解反应在容积为2 L的密闭容器内进行。
已知起始时氨气的物质的量为4 mol,5秒末为2.4 mol,则用氨气表示该反应的速率为()A.0.32 mol/(L·s) B.0.16 mol/(L·s) C.1.6 mol/(L·s) D.0.8 mol/(L·s)3.未来新能源的特点是资源丰富,在使用时对环境无污染或污染很小,且可以再生。
下列属于未来新能源的是()①天然气②煤③核能④石油⑤太阳能⑥生物质能⑦风能⑧氢能A.①②③④B.⑤⑥⑦⑧C.③⑤⑥⑦⑧D.③④⑤⑥⑦⑧4.把下列4种X溶液,分别加入到4个盛有10 mL 2 mol/L盐酸的烧杯中,并加水稀释到50 mL,此时X与盐酸缓慢地进行反应,其中反应速率最大的是()A.20 mL,3 mol/L B.20 mL,2 mol/L C.10 mL,4 mol/L D.10 mL,2 mol/L5.下列说法正确的是()A.1molH2SO4与1molBa(OH)2完全中和所放出的热量为中和热B.在101KPa时,1mol碳燃烧所放出的热量为碳的燃烧热C.由C(石墨)→C(金刚石);△H = +1.9 kJ/mol 可知,金刚石比石墨稳定D.等量的硫蒸气和硫固体分别完全燃烧,前者放出热量多6.已知4 NH3(g)+5O2(g)==4NO(g)+6H2O(g),若反应速率分别用v(NH3)、v(O2)、v(NO)、v(H2O)(mol·L-1·min-1)表示,则下列关系正确的是()A.4/5 v(NH3)= v(O2) B.5/6 v(O2)= v(H2O) C.2/3 v(NH3)= v(H2O) D.4/5 v(O2)= v(NO) 7.含NaOH 20.0g的稀溶液与足量稀盐酸反应,放出28.7 kJ的热量,表示该反应的热化学方程式正确的是()A.NaOH(aq)+HCl(aq)==NaCl(aq)+H2O(l);△H= +28.7 kJ·mol-1B.NaOH(aq)+HCl(aq)==NaCl(aq)+H2O(l);△H= _28.7 kJ·mol-1C.NaOH(aq)+HCl(aq)==NaCl(aq)+H2O(l);△H=+57.4 kJ·mol-1D.NaOH(aq)+HCl(aq)==NaCl(aq)+H2O(l);△H= _57.4 kJ·mol-18.下列热化学方程式中ΔH的数值能表示燃烧热的是()A.H2(g) + Cl2(g) = 2HCl(g) ΔH =-184.6kJ/molB.CH4(g) + 2O2(g) = CO2(g) + 2H2O(g) ΔH =-802.3kJ/molC.2H2(g) + O2(g) = 2H2O(l) ΔH =-571.6kJ/molD.CO(g) + 1/2O2(g) = CO2(g) ΔH =-283kJ/mol9.一定条件下,向2 L密闭容器中加入2 mol N2和10 mol H2,发生反应N2+3H 22NH3,2 min时测得剩余N2为0.5 mol·L-1,下列表示其化学反应速率正确的是() A.v(N2)=0.25 mol·L-1·min-1B.v(N2)=0.75 mol·L-1·min-1C.v(NH3)=1 mol·L-1·min-1D.v(NH3)=0.25 mol·L-1·min-110.下列有关化学反应速率的说法中,正确的是()A.100 mL 2 mol/L的盐酸与锌反应时,加入适量的氯化钠溶液,生成氢气的速率不变B.用铁片和稀硫酸反应制取氢气时,改用铁片和浓硫酸可以加快产生氢气的速率C.二氧化硫的催化氧化是一个放热反应,所以升高温度,反应速率减慢D.汽车尾气中的CO和NO可以缓慢反应生成N2和CO2,减小压强,反应速率减慢11.已知胆矾溶于水时溶液温度降低,胆矾分解的热化学方程式为:CuSO4•5H2O(s)=CuSO4(s)+5H2O(l)ΔH=Q1kJ·mol-1;室温下,若将1mol无水硫酸铜溶解为溶液时放热Q2kJ,则:()A、Q1>Q2B、Q1=Q2C、Q1<Q2D、无法比较12.已知下列热化学方程式:Zn(s)+ 1/2 O2(g)= ZnO(s)ΔH= -351.1 kJ·mol-1Hg (l ) + 1/2 O 2(g )= HgO (s ) ΔH= -90.7 kJ ·mol -1由此可知Zn (s )+ HgO (s )= ZnO (s )+ Hg (l )的反应热ΔH 为( ) A.-260.4 kJ ·mol -1 B.+260.4 kJ ·mol -1 C.- 441.8 kJ ·mol -1 D.+ 441.8 kJ ·mol -1 13.在恒温、恒容的密闭容器中进行反应A(g)B(g)+C(g)。
最新七年级上学期第一次语文校本作业含答案(限时训练 周考试卷)
2022-2023学年第一学期七年级语文校本作业(1)练习时间:2022年9月16日总分60分学校:___________姓名:___________班级:___________考号:___________一、古诗默写(20分)1.我寄愁心与明月,。
2. ,闻道龙标过五溪。
3. ,风正一帆悬。
4. ,江春入旧年。
5.乡书何处达?6. ,小桥流水人家,古道西风瘦马。
7.夕阳西下,。
8.三五二八时,9. ,月是故乡明。
10.明月不谙离恨苦,二、古诗赏析(9分)观沧海东临碣石,以观沧海。
水何澹澹,山岛竦峙。
树木丛生,百草丰茂。
秋风萧瑟,洪波涌起。
日月之行,若出其中;星汉灿烂,若出其里。
幸甚至哉,歌以咏志。
11.选出下列对曹操的《观沧海》赏析正确..的一项()3分A.“水何”六句,诗人从大处落笔,浓墨重彩地描绘大海浩瀚壮阔的景象,着力烘托山岛的高峻和草木的丰茂,使人感到海边景色的壮丽多姿。
B.诗中描写了萧瑟的秋风、汹涌的波涛,营造悲凉伤感的意境。
C.诗人运用了大胆的夸张、丰富的想象、借景抒情等手法使意象瑰丽、意境开阔,全诗感情奔放,思想含蓄,显出雄浑苍劲的诗风。
D.本诗最后两句诗在《步出夏门行》各章末尾都有,和诗歌内容有着直接的关系。
12.这首诗表达了作者什么情感,请简要分析。
(6分)三、现代文阅读(31分)油菜花开祁云枝①迎春花在节气中醒来,苏醒在尚未展叶的枝条上,开始用黄色的小喇叭,一一唤醒草木邻居。
玉兰率先脱掉茸毛外套,踮脚、侧腰,那甜丝丝的花香,便一缕缕氤氲在空气里。
桃花接力,未曾开口,已粉面含羞,夭夭倾城;连翘、金钟、棣棠,对镜贴花黄;樱花、海棠、紫荆、丁香,都以最美的姿态,登上了春的舞台。
②和这些千娇百媚的春花不同,油菜花的出现,像一大群年轻人兴高采烈地一起涌来,肩并肩,手挽手,每位成员,都自带光芒。
大地透亮,如片片黄绿色的海。
江西婺源、云南罗平、陕西汉中等地,因为油菜花,成为这个季节里令人向往的地方。
人教版数学七年级上册强化限时练:3.4 《一元一次方程》实际应用题(一)
七年级上册强化限时练:第3章《一元一次方程》实际应用题(一)满分:100分限时60分钟练习一:每题10分,共50分1.为方便市民出行,减轻城市中心交通压力,青岛市掀起一轮城市基础设施建设高潮,动工修建贯穿东西、南北的地铁1、2、3、11号线,已知修建地铁2号线32千米和3号线66千米共投资581.6亿元,且3号线每千米的平均造价比2号线每千米的平均造价多0.2亿元.(1)求2号线、3号线每千米的平均造价分别是多少亿元?(2)除地铁1、2、3、11号线外,青岛市政府规划未来五年,还要再建182千米的地铁线网,据预算,这182千米地铁线网每千米的平均造价是3号线每千米的平均造价的1.2倍,则还需投资多少亿元?2.已知数轴上两点A,B对应的数分别为﹣1、3,点P为数轴上一动点,其对应的数为x.(1)若点P到点A、点B的距离相等,则点P对应的数是.(2)数轴上存在点P到点A、点B的距离之和为8,则x=.(3)若将数轴折叠,使﹣1与3表示的点重合,则点P与数表示的点重合(用含x代数式表示);(4)若点P从A点出发沿数轴的正方向移动,速度为每秒2个单位长度,设运动时间为t,在移动过程中,是否存在某一时刻t,使得点P到点A距离等于点P到点B距离的2倍,若存在,请求出t的值;若不存在,请说明理由.3.数轴上A点对应的数为﹣5,B点在A点右边,电子蚂蚁甲、乙在B分别以2个单位/秒、1个单位/秒的速度向左运动,电子蚂蚁丙在A以3个单位/秒的速度向右运动.(1)若电子蚂蚁丙经过5秒运动到C点,求C点表示的数;(2)若B点表示的数为15,它们同时出发,请问丙遇到甲后多长时间遇到乙?;(3)在(2)的条件下,设它们同时出发的时间为t秒,是否存在t的值,使丙到乙的距离是丙到甲的距离的2倍?若存在,求出t的值;若不存在,说明理由.4.武汉长江大桥被称为“万里长江第一桥”,是武汉著名的旅游景点之一.如图,点O为原点,向右为正方向,1米为一个单位长度画数轴.甲动车位于AB,向右行驶.乙动车位于CD,向左行驶.武汉长江大桥为BC.甲乙动车长度相等,速度均为80米/秒.A、B、C表示的数分别是a、b、c.已知(a+100)2+(b﹣100)2+|c﹣1700|=0.(1)a=,AB=,BC=;(2)从此刻开始算起,在甲动车A处有个在座位上的乘客记为点P,求动车行驶多少秒,点P到点B的距离与点P到点C的距离之和等于1700米;(3)若甲动车A处的乘客记为点P,向右走,速度为2米/秒.乙动车中点在座位上的乘客记为点Q,乘客P从车尾走到车头的过程中是否存在一段时间t,恰好P、Q同时在武汉长江大桥上?若存在,请求出t的值;若不存在,请说明理由.5.如图,数轴上点A表示数a,点B表示数b,数a、b满足|a+2|+(b﹣8)2=0,AB 表示点A、B之间的距离,且AB=|a﹣b|.(1)a=,b=;(2)数轴上P点表示的数为x,当x为何值时,点P到点A的距离等于点P到点B的距离的2倍?(3)若在原点处放一挡板,一小球甲从点A处以3个单位长度/秒的速度向左运动,同时另一小球乙从点B处以4个单位长度/秒的速度也向左运动,乙在碰到挡板后(忽略球的大小,可看为一点)立即以原来的速度向相反的方向运动,设运动的时间为t秒,求甲、乙两只小球到原点的距离相等时所对应的时间t(写出解答过程).练习二:每题10分,共50分6.某社区超市第一次用6000元购进甲、乙两种商品,其中乙商品的件数比甲商品件数的倍多15件,甲、乙两种商品的进价和售价如下表:(注:获利=售价﹣进价)甲乙进价(元/件)22 30售价(元/件)29 40(1)该超市购进甲、乙两种商品各多少件?(2)该超市将第一次购进的甲、乙两种商品全部卖完后一共可获得多少利润?(3)该超市第二次以第一次的进价又购进甲、乙两种商品,其中甲商品的件数不变,乙商品的件数是第一次的3倍;甲商品按原价销售,乙商品打折销售,第二次两种商品都销售完以后获得的总利润比第一次获得的总利润多180元,求第二次乙商品是按原价打几折销售?7.把正整数1,2,3,4,…,2017排列成如图所示的一个数表.(1)用一正方形在表中随意框住4个数,把其中最小的数记为x,另三个数用含x的式子表示出来,从大到小依次是,,;(2)当被框住的4个数之和等于416时,x的值是多少?(3)被框住的4个数之和能否等于622?如果能,请求出此时x的值;如果不能,请说明理由.8.某文教店出售甲、乙两种碳素笔,已知每支甲种碳素笔比每支乙种碳素笔多售1元,并且2支甲种碳素笔和3支乙种碳素笔的售价相同.(1)求每支甲种、乙种碳素笔的价格各是多少元?(2)小明要在该文教店买4支甲种碳素笔和3支乙种碳素笔共需多少元?9.一辆汽车从A地驶往B地,前路段为普通公路,其余路段为高速公路.已知汽车在普通公路上行驶的速度为50km/h.在高速公路上行驶的速度为90km/h,汽车从A 地到B地一共行驶了4h.请根据以上信息,就该汽车行驶“时间”或“路程”提出一个问题,并用一元一次方程解决这个问题.10.如图,已知A、B分别为数轴上的两点,A点对应的数为﹣20,B点对应的数为80.(1)请直接写出AB的中点M对应的数;(2)现在有一只电子蚂蚁P从A点出发,以2个单位/秒的速度向右运动,同时另一只电子蚂蚁Q恰好从B点出发,以3个单位/秒的速度向左运动,设两只电子蚂蚁在数轴上的C点相遇,请求出C点对应的数是多少;(3)若当电子蚂蚁P从A点出发时,以2个单位/秒的速度向右运动,同时另一只电子蚂蚁Q恰好从B点出发,以3个单位/秒的速度向左运动,经过多长时间两只电子蚂蚁在数轴上相距25个单位长度?参考答案1.解:(1)设2号线每千米的平均造价为x亿元,则3号线每千米的平均造价为(x+0.2)亿元,依题意,得:32x+66(x+0.2)=581.6,解得:x=5.8,∴x+0.2=6.答:2号线每千米的平均造价为5.8亿元,3号线每千米的平均造价为6亿元.(2)6×1.2×182=1310.4(亿元).答:还需投资1310.4亿元.2.解:(1)若点P到点A、点B的距离相等,则P为AB的中点,BP=PA.依题意得3﹣x=x﹣(﹣1),解得x=1.故点P对应的数是1.故答案为:1;(2)由AB=4,若存在点P到点A、点B的距离之和为8,P不可能在线段AB上,只能在A点左侧,或B点右侧.①P在点A左侧,PA=﹣1﹣x,PB=3﹣x,依题意得(﹣1﹣x)+(3﹣x)=8,解得x=﹣3;②P在点B右侧,PA=x﹣(﹣1)=x+1,PB=x﹣3,依题意得(x+1)+(x﹣3)=8,解得x=5.故P点对应的数是﹣3或5.故答案为:﹣3或5;(3)(﹣1+3)÷2=1,若将数轴折叠,使﹣1与3表示的点重合,则点P与数1×2﹣x=2﹣x表示的点重合.故答案为:2﹣x;(4)①P在线段AB上,依题意有PA=2t,PB=4﹣2t,依题意有2t=2(4﹣2t),解得t=;②P在点B右边时,依题意有2t=2(2t﹣4),解得t=4.故t的值为或4.3.解:(1)由题知:C:﹣5+3×5=10 即C点表示的数为10;(2)B到A的距离为|15+5|,点B在点A的右边,故|15+5|=15+5=20,由题得:﹣=1,即丙遇到甲后1s遇到乙;(3)①在电子蚂蚁丙与甲相遇前,2(20﹣3t﹣2t)=20﹣3t﹣t,此时t=(s);②在电子蚂蚁丙与甲相遇后,2×(3t+2t﹣20)=20﹣3t﹣t,此时t=(s);综上所述,当t=s或t=s时,使丙到乙的距离是丙到甲的距离的2倍.4.解:(1)∵(a+100)2+(b﹣100)2+|c﹣1700|=0.∴a+100=0,b﹣100=0,c﹣1700=0,则a=﹣100,b=100,c=1700.∴AB=200,BC=1600故答案是:﹣100;200;1600;(2)设运动时间为t秒,则点P表示﹣100+80t,①﹣100+80t=50,∴.②﹣100+80t=1750,∴.综上所述,动车行驶的时间是s或s;(3)点P表示﹣100+82t,点Q表示1800﹣80t,点P行驶到点A所需时间:点P行驶到点B所需时间:点Q行驶到点B所需时间:点Q行驶到点A所需时间:所以,.5.解:(1)∵|a+2|+(b﹣8)2=0,∴a+2=0,b﹣8=0,∴a=﹣2,b=8.故答案为:﹣2;8.(2)依题意,得:|x﹣(﹣2)|=2|x﹣8|,∴x+2=2(8﹣x)或x+2=2(x﹣8),解得:x=或x=18.答:当x为或18时,点P到点A的距离等于点P到点B的距离的2倍.(2)8÷4=2(秒).当0≤t≤2时,甲球所在位置表示的数为﹣3t﹣2,乙球所在位置表示的数为8﹣4t,∴0﹣(﹣3t﹣2)=8﹣4t,解得:t=;当t>2时,甲球所在位置表示的数为﹣3t﹣2,乙球所在位置表示的数为4t﹣8,∴0﹣(﹣3t﹣2)=4t﹣8,解得:t=10.答:当t为或10时,甲、乙两只小球到原点的距离相等.6.解:(1)设第一次购进甲种商品x件,则购进乙种商品(x+15)件,根据题意得:22x+30(x+15)=6000,解得:x=150,∴x+15=90.答:该超市第一次购进甲种商品150件、乙种商品90件.(2)(29﹣22)×150+(40﹣30)×90=1950(元).答:该超市将第一次购进的甲、乙两种商品全部卖完后一共可获得利润1950元.(3)设第二次乙种商品是按原价打y折销售,根据题意得:(29﹣22)×150+(40×﹣30)×90×3=1950+180,解得:y=8.5.答:第二次乙商品是按原价打8.5折销售.7.解:(1)从表格可看出框的4个数,左右相邻的差1,上下相邻的差7,设最小的数是x,右边的就为x+1,x下面的就为x+7,x+7右边的为x+8,所以这三个数为x+1,x+7,x+8;(2)根据题意得,x+(x+1)+(x+7)+(x+8)=416,4x+16=416,x=100;(3)被框住的4个数之和不可能等于622,依题意得,x+(x+1)+(x+7)+(x+8)=622,4x+16=622,x=151.5,∵x是正整数,不可能是151.5,∴被框住的4个数之和不可能等于622.8.解:(1)设每支乙种碳素笔的价格是x元,则每支甲种碳素笔的价格是每支(x+1)元,根据题意得:2(x+1)=3x,解得:x=2,∴x+1=3.答:每支甲种碳素笔的价格是3元,每支乙种碳素笔的价格是2元.(2)4×3+3×2=18(元).答:小明要在该文教店买4支甲种碳素笔和3支乙种碳素笔共需18元.9.解:问:A、B两地间距离多少千米?设A、B两地间相距x千米.由题意得,,3x+5x=2400,x=300.答:A、B两地相距300km.10.解:(1)设AB的中点M对应的数为x,根据题意得:80﹣x=x﹣(﹣20),解得:x=30.答:AB的中点M对应的数为30.(2)设C点对应的数是y,根据题意得:=,解得:y=20.答:C点对应的数是20.(3)设经过t秒两只电子蚂蚁在数轴上相距25个单位长度,根据题意得:2t+3t=80﹣(﹣20)﹣25或2t+3t=80﹣(﹣20)+25,解得:t=15或t=25.答:经过15秒或25秒两只电子蚂蚁在数轴上相距25个单位长度.。
计时法练习题
计时法练习题计时法是一种提高效率和管理时间的方法,通过规划和限制时间来增加工作和学习的效果。
计时法练习题是帮助人们锻炼时间管理技能和提高自我调节能力的实践工具。
以下是一套计时法练习题,让我们一起来尝试提高时间管理能力吧!练习一:专注力练习活动一:集中注意力设定一个时间,比如20分钟,选择一个任务,例如阅读一篇文章或是完成一项工作。
在规定的时间内,全神贯注地完成任务,不被其他事物干扰。
活动二:番茄钟法采用番茄钟法进行工作学习,每个番茄钟的时间为25分钟,之后休息5分钟。
持续完成番茄钟,直到任务完成。
练习二:任务分配练习活动一:任务计划选择一天的时间进行任务规划。
将任务按照重要性和紧急性进行分类,制定详细的工作计划,并设定每个任务的时间限制。
活动二:任务清单在每天开始工作前,制作一份任务清单。
将任务按照优先级排序,确保高优先级任务得到优先完成。
练习三:时间估算练习活动一:时间记录记录每项任务的完成时间,与预期完成时间进行对比,分析完成任务所需的时间是否符合预期。
通过时间记录,逐渐提高对任务完成时间的准确估算。
活动二:时间挑战选择一个任务,设定一个时间限制,并在规定时间内尽可能快速完成。
通过挑战,培养快速高效完成任务的能力。
练习四:自我约束练习活动一:限制娱乐时间设定一个娱乐时间的限制,如每天仅限定1小时的游戏时间或社交媒体时间。
逐渐减少娱乐时间,培养自我约束的能力。
活动二:短期目标设定设定一个短期目标,如一周内完成一项重要任务。
为了达成目标,进行时间约束,减少非必要的娱乐活动,提高工作效率。
通过以上的计时法练习题,我们可以不断锻炼和提高时间管理能力,从而提高工作效率和生活质量。
建议将计时法融入日常生活中,并结合个人情况进行适度调整,以达到最佳效果。
希望大家能够通过计时法获得更好的时间管理和自我管理能力!。
40分钟限时练习1-挑战2023年中考数学基础满分训练(原卷版)
40分钟限时练习(1)一.选择题(共8小题,满分24分,每小题3分)1.(3分)﹣8的倒数是( )A .8B .18C .−18D .﹣8 2.(3分)若√x+2x有意义,则实数x 的取值范围为( ) A .x >﹣2 B .x ≥﹣2 C .x >﹣2且x ≠0 D .x ≥﹣2且x ≠03.(3分)2022年11月5日,“长征三号”运载火箭在西昌卫星发射中心点火起飞,随后将“中星19号”卫星准确送入高度为35800千米的预定轨道,发射任务取得圆满成功.该卫星主要为跨太平洋重要航线、东太平洋海域及北美西海岸等覆盖区域提供通信服务.数据35800用科学记数法表示为( )A .0.358×105B .358×102C .3.58×104D .3.58×105 4.(3分)分式方程1x−2=3x 的解为( ) A .x =3 B .x =2C .x =1D .无解 5.(3分)已知点(﹣2,3)在反比例函数y =k x 的图象,则下列各点也在该图象上的是( )A .(2,3)B .(1,﹣6)C .(6,−12)D .(0,0)6.(3分)计算2sin 30°的值为( )A .1B .√3C .2D .2√37.(3分)一个多边形的内角和的度数可能是( )A .1700°B .1800°C .1900°8.(3分)下列图形中,既是轴对称图形也是中心对称图形的有( )A .4个B .3个C .2个D .1个二.填空题(共8小题,满分32分,每小题4分)9.(4分)因式分解:ma 2﹣2am +m = .10.(4分)化简:3m 2n9m = .11.(4分)如图,四边形OABC 是矩形,OC 在x 轴上,OA 在y 轴上,函数y =x 的图象与AB 交于点D (3,3),点E 是射线BC 上一点,沿DE 折叠点B 恰好落在函数y =x 的图象上,且BE =2CE ,则点B 的坐标为 .12.(4分)已知下列命题:①若a2=b2,则a=b;②2022年全年鄂尔多斯市一般公共预算累计完成842.8亿元,用科学记数法表示为8.428×1010元;③二元一次方程2x+y=6的正整数解有3对;④连接两点之间的线段叫做两点之间的距离.是真命题的是.(只填序号)13.(4分)为了落实“双减”政策,减轻学生作业负担,某学校领导随机调查了九(1)班学生每天在作业上共花费的时间,随机调查了该班10名学生,其统计数据如下表:则这10名学生每天在作业上花费的平均时间是小时.时间(小时)43210人数2421114.(4分)如图,四边形ABCD中,E、F、G、H依次是各边中点,O是四边形内一点,若S四边形AEOH=3,S四边形BFOE=4,S四边形CGOF=5,则S四边形DHOG=.15.(4分)如图,在▱ABCD中,∠ABC<90°,⊙O与它的边BA,BC相切,射线BO交边AD于点E.当AB=6,AD=8时,DE的长等于.16.(4分)如图,点A是反比例函数y=kx(k≠0,x<0)图象上一点,过点A作AB⊥y轴于点D,AD=DB.若点C为x轴上任意一点,且S△ABC=9,则k的值为.三.解答题(共4小题,满分44分)17.(10分)计算:(1)(√12−√13)×√3+(12)0;(2)(m ﹣1)2﹣m (m ﹣3).18.(10分)计算.(1){x −y =12x +5y =9;(2)3x +2≤﹣2(x ﹣2).19.(12分)为了解市民对全市创卫工作的满意程度,某中学数学兴趣小组在全市甲、乙两个区内进行了调查统计,将调查结果分为不满意,一般,满意,非常满意四类,回收、整理好全部问卷后,得到下列不完整的统计图.请结合图中信息,解决下列问题:(1)求此次调查中接受调查的人数,并补全条形统计图.(2)若本市人口300万人,估算该市对市创卫工作表示满意和非常满意的人数.(3)兴趣小组准备从调查结果为不满意的4位市民中随机选择2位进行回访,已知4位市民中有2位来自甲区,另2位来自乙区,请用列表或用画树状图的方法求出选择的市民均来自同区的概率.20.(12分)如图,在△ABC中,AB=AC,D是边BC延长线上一点,连接AD.AE∥BD,∠BAC=∠DAE,连接CE交AD于点F.(1)若∠D=36°,求∠B的度数;(2)若CA平分∠BCE,求证:△ABD≌△ACE.。
江苏省苏州工业园区西交附中中学2021-2022学年七年级下学期Unit1限时练习
2021-2022学年第二学期初一英语限时练习(2022.02)I卷(满分55分)一、单项填空(10分,每小题1分)1.Our hometown a new school in the centre of the town next year.A.buildsB.will buildC.buildD.has build2.-I'm a little hungry,Mum! -There are some apple pies on the table. You may takeA.itB.thisC.thatD.one3.I will be free then. I don't know for my holiday.A.where to goB.to go whereC.where can goD.to go to where4.Don't read the newspaper.There isn't in it.A.something interestingB.interesting nothingC.anything interestingD.interesting anything5.Daniel lives his family the second floor a building.A.with;in;atB.with;on;inC.in;in;onD.in;on;on6.There_any classes tomorrow if there is too much snow.A.isn't going to beB.isn't going to haveC.won't beD.won't have7.-How do you say 2,505,041?-It'sA.two millions five hundred and five thousand and forty-oneB.two million five hundred and five thousand and forty-oneC.two million and five hundreds and five and forty oneD.two million five hundred and thousand five forty one8.-_your hometown like?-It's a good placeA.How's;to liveB.How does;livingC.What's;to liveD.What does;living9.The college students different skills are readyA.with;helpingB.have;helpingC.with;to helpD.have;to help10.-Excuse me, may I use your computer now? I'm typing an important letter.A.Will you?B.I hope so.C.Why not?D. I'm afraid not.二、完形填空(10分,每小题1分)The school party is only two weeks away,and our children are all as 11 as bees(蜜蜂)getting ready for it.That afternoon,as I12 from my desk, Patty is standing there. She has waited to talk tome.“Every year t he other kids are always in a p-p-p-p-play or something, singing ort-t-t-t-talking,but I g-g-g-g-get to do some 13 work for them.This year,I w-w-want to read a p-p-p-poem(诗),myself!Please,Miss Teresa!”She is so 14 that I can't refuse(拒绝)her.I have to say,“Yes,you will.”I try to find some poems for her,but_15 of my books is of good use. At last, I work out a poem carefully myself. The poem isn't beautiful, but it will 16 best for Patty.After a moment's reading,Patty have remembered(记住)all the 17 and is prepared to do the poem.However, I have to stop her from doing too fast. Day after day,we work together after school.She makes wonderful progress(进步).The night of the party sees children in18.The headmaster(校长)walks up to me with a piece of paper-the program list(节目单). “There is a19_! Look, Patty here. But she can't even say her own name well!”I have no 20 to explain(解释)because many of my students are going up there.So I say to him,“We know what we are doing.”Patty's turn(机会)comes.She walks up there,neither fast nor slowly. She stands there.She begins.I can hardly breathe. I feel time stops.She says every word clearly.She does every line nicely.Applause! Applause everywhere!11.A.happy B.busy C.small D.lovely12. A.look after B.look at C.look for D.look up13. A.difficult B.important C.boring D.quiet14.A.hopeful B.wonderful C.thankful D.careful15.A.one B.some C.none D.both16. A.speak B.work C.write D.look17.A.articles B.lines C.titles D.poems18. A.trouble B.surprise C.excitement D.danger19. A.question B.mistake C.thing D.reason20. A.interest B.way C.wish D.time三、阅读理解(30分,每小题2分)AIt's a good idea for children to go to summer camp. Let's look at some camp rules. It's good for you to learn about them.A.Sing songs.B.Dance.C.Have a picnic.D.Run.22.Why can't children put food in tents?A.They have to keep the tent clean.B.They have to keep the food fresh(新鲜的).C.The dangerous animals can smell the food.D. It's not healthy to have food in tents.23.It's a bad idea for children toA.go to summer campB.have food with friendsC.drink water in the tentD.play with fireBBirthday cards and parties are usually the most popular ways for children to celebrate their birthdays,but not for Logan Brown in the USA. He has serious autism(自闭症). He can't talk and doesn't have any friends.According to his mother Catherine, he stopped getting birthday cards and having parties years ago. This year was Logan's 12th birthday. His mother loves him and wants him to have a great birthday just like other children. She turns to Facebook (a website) for help, inviting friends and strangers to send her son cards for his 12th birthday. In Catherine's Facebook post, she wrote,“Will you write Happy Birthday Logan--from your friend-in Washington,Hawaii...? Help us celebrate Logan's birthday!”Then the Browns are excited to receive more than 3,000 birthday cards from all over the world.When one police officer read Catherine's Facebook post by chance,he decides to organize a surprise party for Logan at a local restaurant. On that day, many police take part in the party and give the little boy a birthday cake and some other gifts. “We ca n't let Logan's birthday pass without something special for him." says the police officer.With the help of his mother and the Internet, Logan has a special birthday.24.Logan stopped getting birthday cards and having parties years ago becauseA.he didn't like themB.he has serious autismC.his mother doesn't love himD.his friends are very poor25.What is Logan like?A.He can't talk, but has a few friends.B.He is talkative.C.He can't talk and has no friends.D.He likes making friends.26. decides to organize a surprise party for Logan.A.A police officerB.Logan's motherC.Logan's fatherD.FacebookCDo you hope to do a lot of homework every evening? Are you interested in your English classes? Who do you want to teach you? Maybe you have lots of questions in your mind before school starts.Well,I want to give you some good advice on these problems.First,keep calm(平静). Don't worry about all the problems you have. Put your heart into learning, and you can find something you are interested in. Do it actively.Second,try your best to finish your homework quickly. Don't spend a lot of time on it.Do more reading or writing in English. Think about the problems you have and solve them at once. Don't stay up(熬夜)late,or you can't study well the next day.Third,invent something instead of copying or repeating. If you can remember the words in your way,you can tell your teachers you don't like the way of copying them again and again.Be sure,you must pass the test.I think your teachers will agree with you. And they can give you some interesting work to do.School is really a good place for us to learn. Believe in your teachers and yourself.You are the best one and you can do everything well.27.The writerwrites this article in order to(为了)A. ask students not to do their homeworkB.give students some good ways of learningC.ask the students not to listen to the teacher carefullyD.tell students what a good teacher and a good school are28.How many pieces of advice does the writer give us?A.ThreeB.FourC.FiveD.Six29.What does the writer tell students to do about their homework?A.They should spend much time on it.B.Do the homework quickly.C.They should do more reading or writing in English.D.They should stay up late doing their home-work.30.What's the third piece of advice about?A.Study in your own way.B.How to get high marks.C.How to get on well with the teachers.D.What kind of schoolwork is better for students.31.According to(根据)the passage,students should believe inA.themselves and their parentsB.their parents and teachersC.their classmates and their friendsD.themselves and their teachersDLi Ruyan, 13 and his classmates in Shanghai did something special last summer.They worked in groups with traffic police at different crossroads in the city. Holding small red flags, the students helped keep order and stopped people from jaywalking(乱穿马路).As part of the school project. Li's school has encouraged its students to do more community work.After the half day of exhausting work Li told himself not to jaywalk anymore.“I think through community work we get to help others and, more importantly, we grow a sense of responsibility(责任感),”he said.Community service is an important part of education for teenagers around the world. In the US and Canada, high school students need to finish 40 hours of community service before graduation(毕业).For those Americans who have finished 1,400 hours of community work,they can be awarded nearly $ 5,000(33,000 yuan).Chinese students today do more community work, too. For example, starting from 2010, Sichuan high school students have been asked to do 10 days of community work. It will become part of their school grade.Qian Lijun, 16,and her classmates in Suzhou, Jiangsu went to a local elder care home this winter.They put Spring Festival couplets on the walls and cheered up the people living there.Li Xiaotian,15,of Anshan said he used to clear flyers(小广告)from telephone poles(电线杆)with his classmates.They brought tools,towels and buckets and worked for three hours under the summer sun. “It was tiring, but seeing the clean poles without ugly ads-we really felt proud,” he said.32.What was the special thing Li Ruyan did last summer?A.He joined a special group of Class13B.He became a policemanC.He helped the traffic police at a crossroadD.He stopped people from talking33.From this passage we know thatA.Li Ruyan's school is in the middle of a big cityB.Li Ruyan and his classmates do some community work every dayC. Ruyan and his classmates often hold small flags when they cross the roadsD.Ruyan and his classmates think it is good for them to do some community workmunity serviceA. has become a very important part of education only in ChinaB. is very important in school education in some foreign countriesC. is the only part of the school project for teenagers around the worldD.needs students to finish at least 1,000 hours of community work35.Which of the following is NOT true according to the passage?munity service helps students grow a sense of responsibilityB.Through community work students get to help others and learn somethingC.Students are now encouraged to do more community work in many school in ChinaD.Students will be awarded much money for doing more community work in Canada and theUS四、信息还原(5分,每小题1分)A: What kind of things do you like to do in your free time?B:36 I play in a city team every Saturday afternoon.A:I didn't know that.B:For about a year. But it's not the only thing I like to do. I also enjoy painting.A:Really?37B:Not too bad. But I'm not a Picasso or Rembrandt.How about you?38A:Well,a couple of times I go bungee(蹦极)jumping with some friends.B:No way! You do? That sounds dangerous! 39A:Not at all.It's amazing. I feel as free as a bird. You should try it sometime.B:Wow! I might want to try it sometime. 40A:Sure.How about this Saturday?B: OK! I can't believe I'm going to do it.36-40.II卷(满分45分)五、词汇检测(10分,每空一词,每小题1分)41.His bicycle is (损坏的)on the way to the hospital.42.You can see many (田地)in the countryside.43.These uniforms are the two (志愿者).44.Beijing is the (首都)of China.45.Look,they are (修理)old washing machines.46.Jack and Jim are next door n47.-Do you want to watch short v_ with me? -Yes,it'll be much fun.48.How about s your unhappiness with your friends? They're so helpful49.December is the month in a year.50.You need to make a before cooking.六、句型转换(5分,每小题1分)51.I don't know what I should wear today.(改为同义句)I don't know today.52.We have our own playground.(改为同义句)We have a playground53.I am going to visit the Great Wall next week.(对划线部分提问)you next week?54.They will meet us at the school gate.(对划线部分提问)they you?55.Her mother is a teacher.(对划线部分提问)her mother?七、完成句子(10分,每小题2分)56.Simon 乐意设计他的新公寓。
高考英语二轮专题练习限时满分练完形填空文体分类练(一)——记叙文
完形填空能力升级练文体分类练(一)——记叙文Test1(2021·山东菏泽一模)Maybe it’s my love of baseball that connects my aunt Helen and me. She has always kept me 1in her experiences of playing baseball back in the 1940s. I would listen to these 2 over and over. She used to say,“Go after what you want. Don’t be ashamed of failing. Real 3 comes from never trying.”In 1943, she was one of the young women who 4 for the All-American Girls Professional Baseball League. She 5 what it would be like to win the championship for her hometown! She imagined a long narrow flag 6 at the baseball field, and on it the name Helen would be there for all to 7.About a week later, Aunt Helen received a 8 from the leaders of the baseball league in Chicago! Aunt Helen 9 it open and learned that she had been invited to the league’s main tryouts!But as the days went by, Aunt Helen became 10 about travelling to Chicago alone. What if she went all that way and 11? When the day of the tryouts 12, she was too afraid to go.Aunt Helen has spent the rest of her life wondering what would have happened 13 she had gone to those tryouts. Because of this, she never missed another 14 in her life. She learned that every dream is worth 15, even if you catch only a few of them.1.A.interested B.concernedC.disappointedD.devoted2.A.messages B.novelsC.storiesD.reports3.A.success B.achievementC.argumentD.embarrassment4.A.made up B.tried outC.stood upD.looked out5.A.thought over B.convinced ofC.dreamed ofD.believed in6.A.growing B.stickingC.postingD.hanging7.A.write B.seeC.listenD.talk8.A.letter B.lectureC.giftD.diamond9.A.threw B.toreC.brokeD.struck10.A.sure B.cautiousC.worriedD.excited11.A.slipped B.fellC.sleptD.failed12.A.lost B.cameC.disappearedD.flew13.A.if B.unlessC.untilD.before14.A.word B.journeyC.opportunityD.instruction15.A.chasing B.runningC.givingD.cherishingTest2(2021·山东济南一模)Five days before Christmas, police officer Lima was sent to a local shop for a reported theft. The accusation was that two females were scanning(扫描) some items at the self-checkout but 1 other items and bagging those items. The females,who had two children with them, were 2 as they left the store.Lima had two girls himself, similar in age to the two girls there, so it 3 him a little bit. Lima 4 the receipt for the items they had paid for. There was nothing else like health and beauty items on it. The items were all 5—things bought just to stuff themselves. Then he asked an employee where the other items were that they had planned to take and was informed they were put back on the 6.Obviously, this family was in real need. While Lima firmly 7 following the law, he decided to cut them a break and not to 8.The two females, 9, were very grateful but kind of 10 because generally in that same situation there would probably be a different 11 and they’d be arrested.Lima took things a step further in an effort to 12 the family. He gave them a $200 gift card, telling them not to get things in illegal ways any more.“I purchased the gift card close to the value of what would have been 13,” said Lima.“I did whatI felt was 14. I just tried to show a little 15 to the extent permitted by law.”beling B.damagingC.sortingD.bypassing2.A.misunderstood B.stoppedC.toleratedD.unemployed3.A.confused B.disappointedC.struckD.attracted4.A.denied B.checkedC.filledD.questioned5.A.luxuries B.drinksC.presentsD.food6.A.shelves B.countersC.checkoutD.lockers7.A.stood B.resistedC.believed inD.put off8.A.make trouble B.take responsibilityC.play tricksD.press charges9.A.consequently B.fortunatelyC.graduallyD.incredibly10.A.ashamed B.shockedC.anxiousD.innocent11.A.lesson B.outcomeC.choiceD.excuse12.A.aid B.controlC.remindD.reward13.A.returned B.exchangedC.takenD.ordered14.A.eye-catching B.risk-takingC.privateD.right15.A.politeness B.courageC.mercyD.admirationTest3(2021·广东高三冲刺联考)Paige Calendine of Zanesville, Ohio, may look a little different from her teammates, but she’s just as talented — if not more so. Paige was born without legs, but she has 1 a lot.Her parents, Sean and Heidi, chose early not to place 2 on her. When she was 18 months old, they enrolled(报名) her in gymnastics classes to help her 3 upper body strength.“Because she was born without legs, she doesn’t know it’s a 4,” Sean explained.“We 5 right away that we would not treat her like a disabled child or make things 6 for her. We wanted her to learn how to 7 the real world.”In the years since, Paige has 8 herself to be a gifted athlete! Not only has her 9 inspired her coaches and teammates, but it’s also earned her 10! In a gymnastics competition, the 8-year-old took first place! 11, she is looking forward to trying other sports in the future, including swimming and archery(射箭)! She has never 12 her abilities and hopes to encourage others to adopt the same13.“Face your disadvantage bravely, and you can 14 anything that happens in your life,” she said.What an inspiration! Paige has 15 that we don’t have to let anything get in the way of doing what we love.1.A.suffered B.achievedC.thoughtD.seen2.A.attention B.limitsC.associationD.goals3.A.build B.evaluateC.controlD.discover4.A.phenomenon B.shameC.burdenD.disability5.A.announced B.signaledC.decidedD.advocated6.A.accurate efulC.easyD.clear7.A.adjust to B.care aboutC.depend onD.cheer for8.A.considered B.provenC.believedD.encouraged9.A.honor B.potentialC.desireD.talent10.A.medals B.skillsC.sympathyD.responsibility11.A.Unexpectedly B.RandomlyC.UnreasonablyD.Differently12.A.analyzed B.describedC.doubtedD.shared13.A.hobby B.attitudeC.luckD.concept14.A.convey B.understandC.selectD.overcome15.A.concluded B.directedC.repliedD.shown完形填空能力升级练文体分类练(一)——记叙文Test1【语篇导读】本文是一篇记叙文。
备战2022年高考数学寒假选择题+填空题精准限时训练 1(新高考版)(原卷版)
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(青岛版六三制)数学六年级上第一单元限时作业 信息窗三
.
小学数学六年级上册限时作业
第一单元分数乘法信息窗三
基本练习
1、学校买来240本新书,其中的2/3分给五年级。
这里是把()看作单位“1”,如果求五年级分到多少本,列式。
2、五(1)班参加课外小组的有40人,五(2)班参加的人数是五(1)班的4/5。
这里是把()看作单位“1”,如果求五(2)班参加的人数是多少?列式。
3、小红有36枚邮票,小新的邮票枚数是小红的5/6,小明的邮票枚数是小新的4/5。
如果求小新有多少枚邮票,是把()看作单位“1”,列式。
如果求小明有多少枚邮票,是把()看作单位“1”,列式。
综合练习
1、买30千克大米,吃了4/5千克,还剩()千克。
买了30千克大米,吃了4/5,吃了()千克。
2、小明每分钟跑85米,小红每分钟跑的米数是小明的4/5。
小红每分钟跑多少米?
3、一张长方形纸的长是9/10,宽是长的5/6,这张纸宽为多少米?它的面积是多少平方米?
拓展练习
1、六(1)班有54名学生,其中有5/9的学生订《科学画报》,1/3的学生订《快乐阅读》。
订《科学画报》和《快乐阅读》的学生各有多少名?
2、六(2)班有36人,这学期有20人订阅了《故事大王》,订阅《童话大王》的人数是订阅《故事大王》的人数的4/5。
订阅《童话大王》的有多少人?
3、小冬看一本96页的故事书,第一天看了全书的1/8,第二天看了第一天的2/3。
第二天看了多少页?第三天小冬应从第几页看起?(先画线段图,再解决问题)
.。
五种方法法求二面角及限时练习
五种方法求二面角及练习题一、 定义法:从一条直线出发的两个半平面所组成的图形叫做二面角, 这条直线叫做二面角的棱, 这两个半平面叫做二面角的面,在棱上取点,分别在两面内引两条射线与棱垂直,这两条垂线所成的角的大小就是二面角的平面角。
本定义为解题提供了添辅助线的一种规律。
如例1中从二面角S —AM —B 中半平面ABM 上的一已知点(B )向棱AM 作垂线,得垂足(F );在另一半平面ASM 内过该垂足(F )作棱AM 的垂线(如GF ),这两条垂线(BF 、GF )便形成该二面角的一个平面角,再在该平面角内建立一个可解三角形,然后借助直角三角函数、正弦定理与余弦定理解题。
例1(2009全国卷Ⅰ理)如图,四棱锥S ABCD -中,底面ABCD 为矩形,SD ⊥底面ABCD,AD =2DC SD ==,点M 在侧棱SC 上,ABM ∠=60°(I )证明:M 在侧棱SC 的中点 (II )求二面角S AM B --的大小。
证(I )略解(II ):利用二面角的定义。
在等边三角形ABM 中过点B作BF AM ⊥交AM 于点F ,则点F 为AM 的中点,过F 点在平面ASM 内作GF AM ⊥,GF 交AS 于G ,连结AC ,∵△ADC ≌△ADS ,∴AS-AC ,且M 是SC 的中点, ∴AM ⊥SC , GF ⊥AM ,∴GF ∥AS ,又∵F 为AM 的中点,∴GF 是△AMS 的中位线,点G 是AS 的中点。
则GFB ∠即为所求二面角. ∵2=SM ,则22=GF ,又∵6==AC SA ,∴2=AM ∵2==AB AM ,060=∠ABM ∴△ABM 是等边三角形,∴3=BF在△GAB 中,26=AG ,2=AB ,090=∠GAB ,∴211423=+=BG 366232222113212cos 222-=-=⨯⨯-+=⋅-+=∠FB GF BG FB GF BFG ∴二面角S AM B --的大小为)36arccos(-FG练习1(2008山东)如图,已知四棱锥P -ABCD ,底面ABCD 为菱形,P A ⊥平面ABCD ,60ABC ∠=︒,E ,F 分别是BC , PC 的中点. (Ⅰ)证明:AE ⊥PD ;(Ⅱ)若H 为PD 上的动点,EH 与平面P AD 所成最大角的正切值为2E —AF —C 的余弦值. 分析:第1题容易发现,可通过证AE ⊥AD 后推出AE ⊥平面APD ,使命题获证,而第2题,则首先必须在找到最大角正切值有关的线段计算出各线段的长度之后,考虑到运用在二面角的棱AF 上找到可计算二面角的平面角的顶点S ,和两边SE 与SC ,进而计算二面角的余弦值。
赛跑定案练习题
赛跑定案练习题第一段:赛跑定案是一项常见的体育运动训练方法,通过模拟赛跑情景,帮助运动员提高起跑、加速、冲刺等关键技能。
本文将介绍一套赛跑定案练习题,帮助运动员们在训练中更好地掌握赛跑技巧和策略。
第二段:练习题1:起跑姿势成功的起跑决定了比赛的整体结果,良好的起跑姿势是至关重要的。
请运动员们站在起跑线上,屈膝低身,将手掌放在地面上,距离肩膀与臀部间隔与肩同宽。
当教练发出指令时,运动员们要迅速用力向前蹬地,达到快速起跑的效果。
练习题2:加速技巧赛跑过程中的加速段是决定成绩的重要环节。
请运动员们从起跑线出发,用最快的速度加速20米,然后保持匀速奔跑直至终点线。
在加速过程中,尽量保持身体直立,重心放在前脚掌上,并保持稳定呼吸。
记录下达到最高速度的时间,以及从加速到匀速所需的时间。
练习题3:冲刺训练赛跑的最后一段是冲刺,也是考验运动员毅力和体能的时刻。
请运动员们在预定的终点线前加速,尽力冲刺至终点线。
在冲刺过程中,要保持挺胸、抬头的姿势,以最大效率地利用身体力量和呼吸。
记录下冲刺过程中达到的最高速度。
第三段:赛跑定案练习题的目的是帮助运动员们通过有针对性的训练,提高起跑速度、加速和冲刺能力,从而在实际比赛中取得更好的成绩。
为了获得更准确的数据和反馈,教练可以配备计时器和记录表格,对运动员们的表现进行记录和分析。
通过定期的练习,运动员们可以不断改进自己的技术和策略,并逐渐提高成绩。
结语:赛跑定案练习题是一种有效提高赛跑技巧的训练方法,通过有针对性的训练,运动员们可以更好地掌握起跑、加速和冲刺等关键技能。
教练和运动员们可以根据实际情况进行相应的调整和改进,以满足个体的需求。
让我们一起努力,通过赛跑定案练习题,提升自己在比赛中的表现,取得更大的成功!。
[学习资料]七年级历史上册 第5课 夏周的兴亡练习1 冀教版
第5课夏商的兴亡一、填空题制,“公天下”变成了“家天下”。
盘庚迁都到商朝的都城从此稳定下来,人们因此称商朝为殷。
二、选择题1、他治水造福于民而名扬天下,又以创建中国历史上第一个奴隶制王朝而名留青史。
他是()A.黄帝B.炎帝C.禹D.启2、“公天下”变为“家天下”反映了我国古代的一项政治制度的出现。
这一制度是()A.王位世袭制B.分封制C.禅让制D.郡县制3、《左转》记载:“夏有乱政,而作禹刑。
”这句话反映了()A.原始部落发生了部落之间的战争 B大禹治水C夏朝设置了监狱 D.夏朝为了镇压奴隶的反抗,而制定了刑法4、下表为夏代历史简表,其中空缺的一项是()5、“我一路赶车来到古都安阳,我脑海里翻涌着的是洹河堤捻上商王的迁徒,殷商巍峨的宫殿群……看那貌似符号一样的甲骨文字,却把中华文明史推进了几百年。
”材料中的迁都的“商王”指的是()A.商汤 B盘庚 C商纣 D.桀6、下列商朝的描述,正确的是()①是我国历史上第二个奴隶制王朝②人们也称其为殷朝③是当时世界上的大国④实行世袭制⑤最后一个国王是汤A. ①②③④B.②③⑤C. ①③④⑤D. ②③④⑤7、“殷纣王的暴虐战车碾碎在了残垣的边缘。
日月轮回。
马走日,象走田,殷走周替换”材料中“殷走周替换”发生于()A.约公元前2070年B.约公元前1600年C.约公元前1046年D.约公元前770年8、“它不但决定了一个延续555年的殷商王朝的灭亡,一个近800年的大周王朝的诞生,而且还为后人留下了许多珍贵的文化借鉴。
”其中的“它”指下列哪一事件()A.涿鹿之战B.版权之战C.牧野之战D.犬戎破镐京9、王亮像韩国学生介绍夏、西、周的历史。
下列各项中与历史不符的是()A.我国历史上第一个王朝建立者是禹B.禹建立夏朝,从此王位世袭制代替禅让制C.汤起兵灭夏,建立商朝D.周武王率大军伐纣,灭商建周10、学习历史的价值之一就在于“前事不忘,后世之师”。
学习了商汤灭夏和武王伐纣的历史,你从中学到的有()①施人政,方能得民心②为君、臣应做到“有功于民”③治国要善于发现人才、重用人才④商灭夏和武王伐纣是战争,是历史的倒退A.①②③④B.②③④C.①②③D.①②④材料分析题夏朝是中国历史上的第一个奴隶制的国家,也是中国历史上最早出现国家形态。
北京中国人民大学附属中学2024-2025学年高一上学期10月限时练习(一)化学试题
试剂 a试剂b高一化学限时练习(一)说明:本试卷共19道题(含1道附加题),总分100+10分,考试时间60分钟。
可能用到的相对原子质量:Na 23 Al27 Cl35.5 Cu 64第一部分本部分共14题,每题3分,共42分。
每题所列选项中,选出符合题目要求的一项。
1.下列有关物质分类的正确组合是分类组合酸 碱 盐 碱性氧化物 酸性氧化物A H ₂SO ₄ Cu ₂ (OH)₂CO ₃.NaHCO ₃ SiO ₂ CO ₂ B HCl NaOH NaCl Na ₂O CO C NH ₃ NaOH CaCl ₂ MgO SO ₃ DHNO ₃KOHCaCO ₃CaOSO ₂2.用如图装置探究溶液离子浓度变化,灯光变化呈“亮→灭→亮”的是AB C D试剂a盐 酸硫酸CuSO4溶液蔗糖溶液试剂bNaOH 溶液Na ₂CO ₃ 溶液Ba(OH)₂ 溶液蒸馏水3. 右图所示为实验室中制备胶体的一种方法。
下列说法正确 的是A. 该制备方法属于物理方法B. 烧杯中液体的颜色逐渐变浅C. 所得液体可产生丁达尔效应D. 所得液体中分散质粒子d>100 nm 4.下列反应能用H ⁴+OH-=H ₂O 表示的是A.NaOH+HCl= NaCl+H ₂OB.Cu(OH)₂+2HCl=CuCl ₂+2H₂OC.2KOH+CO₂=K₂CO₃+H₂OD.Ba(OHD)₂+H₂SO4—BaSO4J+2H₂O5、下列各组离子中,能在溶液中大量共存的是A.H+ 、K+ 、NO₃- 、SO₄2-B.Na+ 、Cu²+ 、OH 、C1-C.Na+ 、H+ 、CO₃²- 、NO₃-D.Ca²+ 、H+ 、SO4²、Cl0- 6.下列转化需要通过氧化还原反应才能实现的是A.Cu→CuSO₄B.Fe₂O₃→FeCl₃C.SO₃→H₂SO₄D.NH₃→(NH4)₂SO₄7. 固体界面上强酸的吸附和离解是多相化学在环境、材料科学等领域研究的重要课题。
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高三物理限时练习1练习时间 50min 命题 郭德仓1.如图,放在水平地面上的物体M 上叠放物体m ,两者间有一条处于压缩状态的弹簧,整个装置相对地面静止,则下列说法不正确的是( )C A .M 对m 的摩擦力方向向右 B .m 对M 的摩擦力方向向左 C .地面对M 的摩擦力向右 D .地面对M 没有摩擦力2.从同一地点同时开始沿同一直线运动的两个物体I .II 的v-t 图象如图所示。
在0~t 2时间内,下列说法中正确的是( )BA .I 物体所受的合外力不断增大,II 物体所受的合外力不断减小B .在第一次相遇之前,t 1时刻两物体相距最远C .I .II 两个物体在t 2时刻刚好相遇D .I .II 两个物体的平均速度大小都是(v 1+ v 2)/23.如图甲所示,质量为m 1的足够长木板静止在光滑水平面上,其上放一质量为m 2的木块。
t =0时刻起,给木块施加一水平恒力F 。
分别用a 1.a 2和v 1.v 2表示木板.木块的加速度和速度大小,图乙中可能符合运动情况的是( )AC4.如图所示,A .B 两小球由绕过轻质定滑轮的细线相连,A 放在固定的光滑斜面上,B .C 两小球在竖直方向上通过劲度系数为k 的轻质弹簧相连,C 球放在水平地面上。
现用手控制住A ,并使细线刚刚拉直但无拉力作用,并保证滑轮左侧细线竖直.右侧细线与斜面平行。
已知A 的质量为4m ,B .C 的质量均为m ,重力加速度为g ,细线与滑轮之间的摩擦不计,开始时整个系统处于静止状态。
释放A 后,A 沿斜面下滑至速度最大时C 恰好离开地面。
下列说法正确的是(A .斜面倾角α=30°B .A 获得最大速度为km g52C .C 刚离开地面时,B 的加速度最大D .从释放A 到C 刚离开地面的过程中,A .B 两小球组成的系统机械能守恒 5.为了让乘客乘车更为舒适,某探究小组设计了一种新的交通工具,乘客的座椅能随着坡度的变化而自动调整,使座椅始终保持水平,如图所示。
当此车减速上坡时,乘客 ( )ACA .处于失重状态B .受到水平向右的摩擦力C .重力势能增加D .所受力的合力沿斜面向上 6.下列图中实线为河岸,河水的流动方向如图v 的箭头所示,虚线为小船从河岸M 驶向对岸N 的实际航线.则其中可能正确是:( )AB7.某次军事演习中,红方飞机甲正从北向南水平匀速飞行,飞行员发现其正前方距离x 处有一架蓝方飞机乙正从东向西水平匀速飞行,随即水平发射炮弹,炮弹的发射方向与飞机的飞行方向成 角,经过时间甲乙ACDBt 炮弹击中飞机乙。
已知飞机甲的速度为v 1,乙的速度为v 2,甲在地面上静止时发射炮弹的速度为v 0。
忽略炮弹竖直方向的位移和所受的空气阻力。
则下列说法中正确的是( )C A .21tan v v θ=B .02cos v v =θ C.t =D .1x t v =8.为了对火星及其周围的空间环境进行探测,我国预计于2011年10月发射第一颗火星探测器“萤火一号”.假设探测器在离火星表面高度分别为h 1和h 2的圆轨道上运动时,周期分别为T 1和T 2.火星可视为质量分布均匀的球体,且忽略火星的自转影响,万有引力常量为G ,仅利用以上数据,可以计算出( )A A .火星的密度和火星表面的重力加速度 B .火星的质量和火星对“萤火一号”的引力C .火星的半径和“萤火一号”的质量D .火星表面的重力加速度和火星对“萤火一号”的引力 9.一摩托车在竖直的圆轨道内侧做匀速圆周运动,周期为T ,人和车的总质量为m ,轨道半径为R ,车经最高点时发动机功率为P 0,车对轨道的压力为2mg 。
设轨道对摩托车的阻力与车对轨道压力为成正比,则( )BA .车经最低点时对轨道的压力为3mgB .车经最低点时发动机功率为2P 0C .车从最高点经半周到最低点的过程中发动机做的功为P 0T/2D .车从最高点经半周到最低点的过程中发动机做的功为2mgR10.如图所示,一长木块被固定在水平面上,质量相同的子弹A .B 从木块两侧同时水平相向地射入木块,最终都停在木块中,子弹A 的射入深度d A 大于子弹B 的深度d B ,假设子弹A .B 在运动过程中所受阻力大小恒定且相同,则可判断( )ABC A .子弹在木块中运动时间长短关系为t A >t B B .子弹射入初动能大小关系为E kA >E kB C .子弹入射初速度大小关系为v A >v BD .子弹对木块的作用力做功多少关系为W A >W B11.某节能运输系统装置的简化示意图如图所示。
小车在轨道顶端时,自动将货物装入车中,然后小车载着货物沿不光滑的轨道无初速度的下滑,并压缩弹簧。
当弹簧被压缩至最短时,立即锁定并自动将货物卸下。
卸完货物后随即解锁,小车恰好被弹回到轨道顶端,此后重复上述过程。
则下列说法中正确的是( )ABCA .小车上滑的加速度大于下滑的加速度B .小车每次运载货物的质量必须是确定的C .小车上滑过程中克服摩擦阻力做的功小于小车下滑过程中克服摩擦阻力做的功D .小车与货物从顶端滑到最低点的过程中,减少的重力势能全部转化为弹簧的弹性势能 12.在光滑绝缘的水平桌面上,存在着方向水平向右的匀强电场,电场线如图中实线所示。
一带正电.初速度不为零的小球从桌面上的A 点开始运动,到C 点时,突然受到一个外加的水平恒力F 作用而继续运动到B 点,其运动轨迹如图中虚线所示,v 表示粒子在C 点的速度。
则下列判断中正确的是 ( )BA. 小球在A 点的电势能比在B 点的电势能小B. 恒力 F 的方向可能水平向左C. 恒力F 的方向可能与v 方向相反D. 在 A .B 两点小球的速率不可能相等 13. A .B 两块正对的金属板竖直放置,在金属板A 的内侧表面系一绝缘细线,细线下端系一带电小球。
两块金属板接在如图所示的电路中。
电路中的R 1为光敏电阻,R 2为滑动变阻器,R 3为定值电阻。
当R 2的滑动触头P 在a 端时闭合开关S 。
此时电流表A 和电压表V 的示数分别为I 和U,带电小球静止时绝缘细线与金属板A 的夹角为θ,电源电动势E 和内阻r 一定。
则以下说法正确的是( )D A .若将R 2的滑动触头P 向b 端移动,则I 不变,U 增大B .保持滑动触头P 不动,用更强的光线照射R 1,则I 增大,U 增大北东C .保持滑动触头P 不动,用更强的光照射R 1,则小球重新达到稳定后θ变大D .保持滑动触头P 不动,用更强的光照射R 1,则U 的变化量的绝对值与I 的变化量的绝对值的比值不变。
14.如图1所示连接电路,电源电动势为6V 。
先使开关S 与1端相连,电源向电容器充电,这个过程可在瞬间完成。
然后把开关S 掷向2端,电容器通过电阻R 放电,电流传感器将测得的电流信息传人计算机,屏幕上显示出电流随时间变化的I-t 曲线如图2所示。
据此图可估算出电容器释放的电荷量,并进而估算出电容器的电容为( )DA .2.0×10-1FB .1.3×10-2FC .4.5×10-3FD .5.5×10-4F15.如图所示,在平行竖直虚线a 与b .b 与c .c 与d 之间分别存在着垂直于虚线的匀强电场.平行于虚线的匀强电场.垂直纸面向里的匀强磁场,虚线d 处有一荧光屏。
大量正离子(初速度和重力均忽略不计)从虚线a 上的P 孔处进入左边电场,经过三个场区后有一部分打在荧光屏上。
关于这部分离子,若比荷q/m越大,则离子 ( )BDA .经过虚线c 的位置越低B .经过虚线c 的速度越大C .打在荧光屏上的位置越低D .打在荧光屏上的位置越高16.如图所示,有理想边界的直角三角形区域abc 内部存14.在着两个方向相反的垂直纸面的匀强磁场,e 是斜边ac 上的中点,be 是两个匀强磁场的理想分界线.现以b 点为原点O ,沿直角边bc 作x 轴,让在纸面内与abc 形状完全相同的金属线框ABC 的BC 边处在x 轴上,t=0时导线框C 点恰好位于原点O 的位置.让ABC 沿x 轴正方向以恒定的速度v 穿过磁场,现规定逆时针方向为导线框中感应电流的正方向,在下列四个i-x 图象中,能正确表示感应电流随线框位移变化关系的是 ( )D17.如图所示,一带电粒子从平行带电金属板左侧中点垂直于电场线以速度v 0射入电场中,恰好能从下板边缘以速度v 1飞出电场.若其它条件不变,在两板间加入垂直于纸面向里的匀强磁场,该带电粒子恰能从上板边缘以速度v2射出.不计重力,则( )B A .2v 0= v 1+v 2 B .v 0=22221v v +C .v 0=21v v ⋅ D .v 0<v 1= v 218.半径为r=0.5m 带缺口的刚性金属圆环在纸面上固定放置,在圆环的缺口两端引出两根导线,分别与两块垂直于纸面的平行金属板连接,两板间距离为d=5cm ,如图甲所示。
金属环处在变化的磁场中,磁感应强度B 的方向垂直于纸面,变化规律如图乙所示(规定向里为正方向)。
在t=0时刻平板间中心有一电荷量为+q 的微粒由静止释放,运动中粒子不碰板,不计重力作用,则以下说法正确的是 ( )BDA .第2s 内上极板带负电B .第3s 内上极板带正电C .第3s 末微粒回到了原位置D .两极板之间的电场强度大小恒为3.14N /C19.在如图所示电路中,电源电动势E=12V ,电阻R 的阻值R=6Ω,线圈L 的自感系数L=4H ,不计电源和电感线圈的内阻,则( )DA .在电键刚闭合的瞬间,电流值是2AB .在电键刚闭合的瞬间,电流的瞬时变化率为2A/sC .在电键闭合了很长一段时以后,其最终电流为3AD .在电键闭合了很长一段时间以后,其最终电流为2A20.如图所示,一只理想变压器原线圈与频率为50Hz 的正弦交流电源相连,两个阻值均为20Ω的电阻串联后接在副线圈的两端。
图中的电流表,电压表均为理想交流电表,原副线圈分别为200匝和100匝,电压表的示数为5V 。
则( )CD A .电流表的读数为0.5AB .流过电阻的交流电的频率为100HzC .交流电源的输出电压的最大值为202VD .交流电源的输出功率为2.5W。