2021九年级寒假作业答案(上册)
2021九年级寒假作业答案（上册）
文言文阅读( 一 )
15.(1)热水 (2)通“披”，穿(2分，每题1分)
16.C(2分)
17.因为心中有足以快乐的事，就不觉得吃的穿的不如别人了。
(2分，意思符合即可)
18.①学习要勤奋刻苦。
②学习要以读书为乐。
(2分，每点1分)
文言文阅读( 二 )
10.(2分)①好：爱好。
(1分)②或：有的人(1分)
11.(2分)C(A介词，因为。
B连词，表示目的。
C 介词，用，D介词，凭借)
12.(4分)①每每对书中的内容有所领会，便高兴得忘记了吃饭。
(2分，“会意”翻译正确1分，其他意思基本对且通顺1分)②房屋简陋，里面空空荡荡的，不能遮挡风吹日晒。
(2分，一句1分)
13.(2分)“不慕荣利”，或“不戚戚于贫贱，不汲汲于富贵”(1分);“忘怀得失”(1分)
文言文阅读( 三 )
23.先生之年/长矣
24⑴通“悦”，高兴⑵入侵⑶受刑、受惩罚⑷ 赐恩惠
25.B(1分)
26.将下列两个句子翻译成现代汉语。
(4分)
⑴你说讲道义，杀少量人还懂得不合理，却要去杀众多的人，不能说是明白事理。
(2分)
⑵墨家大师腹黄享忍心杀掉自己心爱的儿子去遵行天下大义，真可算得上公正无私了。
(2分)
27.下联：腹黄享(钜子腹)行法杀(诛)子，公正无私。
(结合材料，符合对仗要求即可)(2分)
文言文阅读( 四 )
17.(3分)(1)早晨(2)仔细，周详(3)确实，的确
18.(2分)B
19.(2分)我的妻子认为我美，是偏爱我。
(意思符合即可)
20.(2分)对别人的褒贬能理智判断和冷静思考。
讲究说理的方法，善于用生活小事设喻。
(写出一点即可)
文言文阅读( 五 )
9.(4分)(1)详尽(2)放晴(3)迫近(4)日光(各1分)
10.(4分)(1)政事顺利，百姓和乐(安居乐业)，许多已荒废了的事业都兴办起来了。
(2分)
(2)离开国都，怀念家乡，担心奸人说坏话、害怕坏人的批评指责。
(2分)
11.(4分)迁客骚人的情：以物喜，以己悲;古仁人的情：不以物喜，不以己悲(或忧国忧民)。
(各1分)目的是：通过这两种情的对比，(1分)赞美了古仁人的高尚品德，表现了作者的旷达胸襟和政治抱负，突出文章主旨。
(1分)
12.(4分)表明观点，言之成理即可。
示例：①能。
这说的是一种从容的平常心境。
只要发挥心灵力量，砥砺意志，就可以养成平常心境。
面对考试的失败，以平常心待之，便做到了“不以物喜，不以己悲”。
②不能。
这是一种需要修炼才能达到的境界，作为中学生，心灵尚需砥砺，战胜外在的力量不易。
担心考试
失败是学生普遍的心态，便是这个道理。
(判断，1分;理由，2分;联系实际，1分。
辩证的思考，答“有时能”“有时不能”，只要理由恰当，就可得分。
) 文言文阅读( 六 )
17。
(1)大概(2)兴旺富裕(3)率领、带领(4)一天天，一天比一天
18。
百姓谁敢不用箪盛饭用壶盛浆来迎接将军您呢?(意对即可)
19。
帝室之胄，信义著于四海，总揽英雄，思贤如渴。
20。
“善”是对诸葛亮对策的高度评价;对诸葛亮的由衷敬佩;请诸葛亮出山的坚定决心;对兴汉事业的必胜信念。
文言文阅读( 七 )
7.(1)居：处在。
(2)进：居庙堂之高。
(3)归：归依。
(4)因为。
8.(1)我曾将探求古代品德高尚的人们的心思，或许不同于(以上)这两种表现的，为什么呢?(2)在天下人忧之前先忧，在天下人乐之后才乐。
9.表达了作者希望与古人同道的思想感情，强烈而又含蓄地表达了作者的自勉之意及对朋友的期望之情。
10.开放题，观点明确、言之成理、语句通顺即可
13.墨子高超的劝说艺术往往体现在类比推理上，请结合【甲】【乙】两段文字说明。
(3分)
文言文阅读( 八 )
9.荆之地 / 方五千里评分：共1分。
10.⑴舍弃，丢弃⑵什么样的⑶拜访⑷更加评分：共2分。
每小题0.5分，意思对即可。
11. ⑴这就好像装饰华美的车子同破车相比。
⑵你不如停止算了。
评分：共2分。
每句1分，意思对即可。
12.非攻(兼爱)(或反对战争)坚忍不拔(或坚守信念)等评分：共2分。
每空1分，意思对即可。
13.示例：【甲】先用一个假设，诱使楚王说出“必为有窃疾矣”，然后连用三个对比，极言楚国物产丰富和宋国物产贫乏，从而类推出楚国攻宋是和有“窃疾”“同类”的结论。
【乙】先假设“一人耕而九人处，耕者益急”，类推出“天下莫为义，子如劝我”的结论。
评分：共3分。
每例分析准确各得1分，语言通顺得1分。
文言文阅读( 九 )
9.⑴ 偏爱⑵慢慢的
评分标准：(2分)每空1分，错字不给分。
10. ⑴从这里就可以看出，大王你受到的蒙蔽也很大啊!
⑵因为旧日的恩情，没几天，虞愿就又被召了回来。
评分标准：(2分)翻译正确，完整即可。
11.示例：不盲目轻信，对别人的褒奖能理智判断、冷静思考，能正视自己。
评分标准：(2分)围绕“有自知之明，善于思考”来答即可。
12.示例：邹忌以家事喻国事，用暗示的方法委婉地规劝齐主，使他乐于接受。
虞愿则是直言进谏，痛斥君过。
我更喜欢前者，因为它更易令人接受。
评分标准：(2分)前一问1分，后一问1分，意对即可。
文言文阅读( 十 )
20、 (4分)( 1)长，高(2)穿戴(3)躺着休息，睡觉(4)偏爱
21、(2分)城北的徐公，是齐国的美男子。
22、(3分)头脑清醒，有自知之明。
(大意写出即可)
文言文阅读( 十一 )
5.①洗涤②生枝蔓说明：本题2分。
6.对于莲的喜爱，像我一样的还有什么人呢?说明：本题2分。
7.为了突出作者对当时追名逐利世风的讽刺与批判，深化文章的主旨。
说明：本题2分。
文言文阅读( 十二 )
9. (1)肉食者/谋之(2)弗敢/加也(2分，每小题1分)10. (1)通“遍”，遍及，普遍(2)为人所信服(3)击鼓进军(4)第二次(4分，每小题1分)
11.我看到他们的车印凌乱，军旗也倒下了，所以才下令追击他们。
(2分)
12.曹刿关于战争的论述(或：曹刿在战前、战中、战后的表现)双方交战的过程(4分，每空2分)
13. ①“公将战”表现鲁庄公面对强敌毫不畏惧。
②“小大之狱，虽不能察，必以情”表现鲁庄公取信于民(或：勤政爱民)。
③“公与之乘”表现鲁庄公礼贤下士。
④“公问其故”表现鲁庄公不耻下问。
⑤鲁庄公发现曹刿才华出众，加以重用，表现鲁庄公知人善任。
⑥在作战时机的选择上，两次遭到曹刿否定，鲁庄公毫不介意，表现鲁庄公胸怀宽广，从善如流。
(3分，任选一处分析，意思对或言之有理均可)
文言文阅读( 十三 )
8、C 9、C 10、C
11、(6分，每小题3分)(1)于是(愚公)带领儿孙中能挑担子的三个成年男子(上了山)，凿石头挖山，用箕畚(装石头、土块)运到渤海岸边。
(评分要点：“箕畚”答对给1分，句子基本正确2分)(2)你太不聪明了!(评分要点：“惠”答对1分，句子基本正确2分)
文言文阅读( 十四 )
14.(5分)(1)驱车追赶。
(2)第二次。
(3)倒下。
(4)指责。
(5)即使。
15.(4分)(1)他们的勇气已尽而我们的勇气正盛，所以打败了他们。
(2)能在公共场合议论(我的)过错，让我听到的，可得到下等赏赐。
(各占2分。
意思对即可)
16.(2分)齐鲁长勺之战齐威王受蒙蔽(各占1分。
意思对即可)
17.(4分)(1)鲁军打败齐军，克敌制胜。
(2)齐威王纳谏，燕赵韩魏来朝。
(各占2分。
意思对即可)
文言文阅读( 十五 )
18、洁身自好，不同流合污，随俗浮沉，也不自我炫耀，行为方正，豁然大度，质朴庄重，不慕名利3分(意思正确，语句通顺，即可得分)
19、托物言志议论君子之德每空1分共3分。
【九年级】2021年初三上册物理寒假作业答案北师大版
【九年级】2021年初三上册物理寒假作业答案北师大版初三第一卷物理寒假作业解答北京师范大学版，希望所有学生都能从中得到帮助。
同时，祝大家学习进步！(一)一、选择：1 b2。
d3。
b4。
b5。
d6。
abc二、填空：7.银河系8.物质化学性质、10-10m、电子显微镜9.体积和形状10.形状，体积，压缩11.分子，原子，核12.固态、液态、气态、物理13.小、大三、综合问题：14(二)一、选择：1 b2。
b3。
补体第四成份。
b5。
ac6。
c7。
bd8。
D二、填空：9.物质的多少、m10.82.2g不变11.天平、台秤、台秤和电子秤12.300、3×108、20、2×10713.g、mg、kg、三、综合问题：省略(三)一、选择：1 a2。
a3。
补体第四成份。
D二、填空：5.一半、一半、一倍6.2.7×每立方米103千克1立方米铝的质量为2.7×103kg7.5×10-5kg8.dbace三、综合问题：9.3.125kg10零点八二×103kg/m32。
46×104kg11.空心、20cm3（四）一、选择：1.c2.a3.c4.d5.d二、填空：6 dcbea7。
质量，体积ρ=m/v8。
可以9.77.4g、30cm32.58×103kg/m310.小三、综合问题：省略(五)一、选择：1 b2。
c3。
a4。
b5。
A.二、填空：6.增大减少7.三、综合问题：8.0.85×103kg/m39。
2.5×104m310。
略为11中空，20cm3(六)一、选择：1 a2。
c3。
a4。
d5。
c6。
D二、填空：7.1立方米水的质量是1×103kg8.变大不变9.水平、平衡螺母、右侧、异径、移动10.200、45、32、3.2×10-57.811.g、计算油的质量deabcfg三、综合问题12.1428(七)一、选择题：1 d2。
【九年级】2021年初三上册化学寒假作业答案
【九年级】2021年初三上册化学寒假作业答案初三化学寒假作业答案(一)书名号答案cddaacbdbdc标题号：11121314151617181920答案bcb14. (1) ① 试管② 气体收集器A:2kmno4==k2mno4+MnO2+O2↑乙：2h2o2====2h2o+o2↑(2)、a、将导管移出水面，熄灭酒精灯(3)、b，密度比空气，能溶于水。
①5g②45g。
15、(1)、47.5%(2)、mg(3)、16.6%。
初中化学寒假作业答疑（二）题号回答dacdcbabdad11、(1)、c、h(2)、co2、h2o(3)、9:2(4)、失，al3+12：（1）2H2O==2h2↑ + 氧气↑ 分解（2），3Fe+2O2==Fe3O4组合(3)、3hcl+al(oh)3====alcl3+3h2o(4)、cu+hg(no3)2===cu(no3)2+hg13.丙烯和乙烯的结晶。
14、（1）、a:he、b:c（2）、nacl15、(1)、①试管②灯精灯。
(2)、a防止k2mno4粉末堵塞导管2kmno4=k2mno4+MnO2+O2↑ 带有Mars的木条延伸到瓶子中并重建。
(3)、be污染环境。
16、(1)、12，(2)、7.9%。
17、(1)、10g90%(2)、固体中滴加稀盐酸无气泡，则无caco3确保w2g全部是杂质质量(3)、乙节约药品(4)、9.7%。
初中三化学寒假作业答疑（3）题号回答ccccababc11、3.75g67.5%12、(1)、铁架台(2)、2h2o2====2h2o+o2↑(3)、adeg(4)、防止生成固体使瓶底炸裂。
13、(1)、feccumg(2)、2al+3fecl2=2alcl3+3fe（3），CuO+H2SO4===CuSO4+h2o14，四（1），H2点火（2），HCl，CuCl2气泡，红物质沉淀（3），cufezn（4）80%。
初三化学寒假作业答案(四)书名号答案bbcbdadbbb11.B12、bc13、BD14（1）、10（2）、清洁（3）、石棉网（4）、润湿。
2021初三寒假作业参考答案_九年级寒假作业部分答案
2021初三寒假作业参考答案_九年级寒假作业部分答案2021初三寒假作业参考答案_九年级寒假作业部分答案初三年级的同学面临着升高中的巨大压力，很多同学都会趁寒假抓紧复习，赶超他人，寒假作业也要认真完成才行，寒假作业做完之后可以来对一下答案，及时查漏补缺。
wtt在这里给大家带来2021初三寒假作业参考答案_九年级寒假作业部分答案，希望大家喜欢!九年级寒假作业答案2021【语文】(一)一、1.B2.D3.A4.C5.A6.C7.B8.A9.A10.B11.B12.C二、1.昔者鲁人不能为酒/唯中山之人善酿千日之酒/鲁人求其方/弗得2.D3.自鸣得意地自以为有了独到的见解。
4.讽刺那些以不知为知，拾人牙慧而沾沾自喜，到处炫耀的人(或：有了一知半解就自以为了不起而夸夸其谈的人)。
三、1.⑴塞下秋来风景异⑵斜晖脉脉水悠悠⑶沙场秋点兵⑷只恐双溪舴艋舟，载不动许多愁⑸史记司马迁(每空1分)2.①三国演义关羽②西游记猪八戒③水浒传鲁智深(每空0.5分)3.①如：传承节日文化，创造美好生活;关注节日文化，就是关注生活;为了节日文化的繁荣，我们牵起手来等。
②如：年轻人对节日文化的认识与理解;我心中的中西节日;节日文化对家庭的影响等。
③说出道理即可。
如西洋节日文化的活泼自由，时代感强，切合年轻人的审美情趣;民族传统节日文化底蕴丰厚，影响深远，民族传统节日文化是中国的悠久文明的象征。
四、1.美在古代诗词，美在自然。
2.城市的美丽只适宜拍照，从照片或书本里才能看到。
3.对城市美的失望和不满，引出下文对整体美的议论。
4.大江东去，浪淘尽，千古风流人物苏轼宋朝采菊东篱下，悠然见南山陶渊明东晋。
5.示例：“能在生活中常常看见美是一大幸事，如能看到他人未能体察的美尤为幸福。
”生活中，常常有很多人不能发现美，可是美无时不在，关键在于你是否有一颗发现美的心。
你能发现人家不容易发现的美，就可说明你有比别人更细腻的心。
(二)一、古代诗词曲复习资料二、四大名著知识填空练习题参考答案：1、曹雪芹2、(1)鲁智深(2)曹操3、林黛玉贾宝玉4、林黛玉5、赤壁之战失街亭三、6、吴用智取生辰纲7、林教头曹操8、吴用水浒传9、武松10、关羽大意失荆州(温酒斩华雄)11、青梅煮酒论英雄12、草船借箭、空城计、七擒七纵等13、六出祈山、东和孙吴、收取东川西川、七擒孟获、北拒曹魏、摆设八阵图。
【九年级】2021学年九年级上册语文寒假作业答案
【九年级】2021学年九年级上册语文寒假作业答案1.好(三声)读书时不好(四声)读书，好(四声)读书时不好(三声)读书意思：读书的大好时期，你不爱读书，当你老了，又想去读书，没有了读书的最佳条件。
阳入(tiáo)琴调(tiáo)崭新调(diào)，阳入(diào)阳入(diào)阳入(tiáo)李小勇(diào)阳入(diào)美种(四声)花种(四声)好花，种(四声)种(三声)种(三声)成种(三声)种(三声)香2.今年不好，晦气太少，严禁打官司。
;儿子读作：今年不好晦气，少不得打官司。
3.落、过、吹、坠、飘、4.一言九鼎、母舰之术、铺天盖地、天壤之别、滴水之恩、一日三秋;最反常的气候--晴天霹雳，最低的巨人--顶天立地最荒芜的地方--不毛之地，最高昂的稿费--一字千金5.不读书使人视野狭窄，知识贫乏，才能枯竭，心灵污垢，情操低俗，精神世界空虚。
6.其实地上本没路，跑的人多了，也竟成了路。
《故乡》鲁迅7.人类破坏环境使更多鸟类濒临灭绝8.人存有悲欢离合，月存有阴晴圆失。
---苏轼《水调歌头》9.《江城子密州出猎》苏轼持节云中，何日遣冯唐?表达了作者渴望得到朝廷的重用二。
阅读与欣赏1.借画眉鸟以抒发自己的感情，前文与后文的对比，突出诗人挣脱牵绊，向往向往自由的心理。
2.格调超逸，形象逼真，咏柳而刺世，言简而意深。
3.(1)看看问题必须用长远眼光，权衡利弊，无法只顾眼前利益(2)因大失小。
4.身无长物：除自身外再没多余的东西，形容匮乏;王恭具备朴素真率的品质。
5.雁奴一心为了大家，却被大家误会，最后落了个一网打尽。
6.(1)医术高超，行医规矩奇特，性格高傲但更添正直。
(2)“格色”意为特别，不含贬意;促进情节的发展，能够更独特地刻画人物形象(3)苏七块获赠药物这一细节描绘，注重地整体表现了布七块正直的本性和独特的个性。
7.瑰丽的想象，诗化的语言。
部编版九年级上册语文寒假作业2(含答案解析)
部编版九年级上册语文寒假作业21.下列句子中没有语病的一项是（）A.著名作家吴伯箫的籍贯是山东莱芜人，他的散文大多以小见大，善于从平凡中挖掘出深刻的内涵。
B.党的十九大会议上，众代表积极讨论并认真听取了李克强总理作的政府工作报告。
C.通过《经典咏流传》节目的播出，让观众在一众唱作歌手的演绎中领略诗词之美。
D.莲花台风景区成为我省继崆峒山、麦积山、敦煌鸣沙山风景区后第四个国家级风景名胜区。
2.下列句中没有语病的一项是（）A.中国不仅是“一带一路”建设的倡议者，更是负责任的参与者、有担当的行动者。
B.通过参加这次活动，使我对中国博大精深的书法艺术产生了浓厚的兴趣。
C.《红海行动》在影片质感和人物情节方面突破了一大步的跨越。
D.防止校车安全事故不再发生是个系统工程，需要多方面、多领域齐心协力完成。
3.下列句子中，没有语病的一项是（）A.《奔跑吧，兄弟》综艺节目深受欢迎的主要原因是其形式新颖、内容丰富造成的。
B.读书切忌不能偷懒，只有勤奋好学，脚踏实地，才能获取知识。
C.经探索发现，火星上不仅有四季、大气和重力，还有水、冰、河道的痕迹。
D.这次大赛掀起了我校同学们书写汉字，激发了他们对汉字、书法等传统文化的兴趣。
4.下列句子没有语病的一项是（）A.感动中国人物钱伟长不仅是当代科技工作者的典范，乐于帮助其他人，因此我们要向他学习。
B.“最美妈妈”吴菊萍，奋不顾身托住小生命，是近年来涌现出的英雄模范人物之一。
C.日本能否在短时间内消除核泄漏带来的严重污染，依赖于科学技术及政府的重视。
D.通过音乐名人高晓松案醉驾入刑的宣判执行，使酒后驾车的人越来越少了。
5.下列各句中有语病的一项是（）A.我并不是否认你学习的进步，而是说你应该制定更合理的学习计划。
B.通过自我风采展示活动，同学们了解了你，你对自己和同学也有了更深入的认识。
C.在中华文明悠久的历史中，爱国主义精神一直是中华民族得以发展、生存和凝聚的动力。
D.优化能源结构是推动我国能源革命的本质要求和经济社会转型发展的迫切需要。
九年级上学期语文寒假作业答案(思考题)
九年级上学期语文寒假作业答案（思考题）九年级上学期语文寒假作业答案（思考题）寒假即将到来，家长朋友们一定要注意孩子的假期学习问题。
查字典语文网初中频道为大家提供了九年级上学期语文寒假作业答案，希望对大家有所帮助。
1、本文出自《孟子?告子上》，作者孟子，战国时期鲁国人，思想家、教育家，是儒家思想的代表人物。
还学过他的文章有《得到多助，失道寡助》《生于忧患，死于安乐》(附四书：《孟子》《论语》《大学》《中庸》)2、归纳段意：第一段：论述舍生取义是人的本性。
第二段：论述见利忘义是丧失本性的行为。
(第一层(1-2句)从正面举例，说明义的存在。
第二层从反面举例，接受万钟这是丧失人的本性。
)3、理解及背诵：(1)本文的中心论点是什么?用原文回答：生，亦我所欲也;义，亦我所欲也，二者不可得兼，舍生而取义者也。
(2)文中能概括全篇大意的句子是：生，亦无所欲也，义，亦我所欲也;二者不可得兼，舍生而取义者也。
开头以鱼和熊掌为喻，巧妙地回答了这个问题，请写出原句：鱼，我所欲也，熊掌，亦我所欲也;二者不可得兼，舍鱼而取熊掌者也。
(3)《鱼我所欲也》中出现的成语有：舍生取义、嗟来之食;由此我们可联想到与本文观点相关的孟子曾说过的三句铺垫。
(5)文中多次使用对比这种手法，请举例说明。
鱼和熊掌对比//生与死对比//向与今天比较等(6)写鱼和熊掌不可得兼时?取熊掌的用意是什么?意在说明在生活中经常会遇到需要选择的事，在两者不可兼得的情况下，人们会选取价值更高的东西，用此事情来比喻舍生取义的道理。
5、联系。
本文观点广为后人所赞同，请找出本文观点并写出与之一致的两句诗。
观点：舍生取义诗句：(1)取义成仁今日事，人间遍种自由花(2)人生自古谁无死，留取丹心照汗青6、应用。
(1)本文孟子用舍生而取义来表现他的人生追求(选择)文天祥《过零丁洋》中体现这种追求的诗句是：人生自古谁无死，留取丹心照汗青。
请写出历史上在人生中有正确选择的人。
例如：岳飞精忠报国，文天祥选择忠义守节，布鲁诺选择坚定信念。
【九年级】2021年初三上学期数学寒假作业答案：人教版
【九年级】2021年初三上学期数学寒假作业答案：人教版
练习一:ccaccbdb30，3或44和616：25：088052号
练习二:acdccb4，等边三角形8210560°110°
练习三:cbdccabb⑷⑹⑺⑴⑵⑶⑸±2/30.69.75×10^105或√7直角10
练习四；bcdddadb-1/2±3-√5.√3-√22.0310035; 815 (√ 是根符号。
）
练习五:cbcddcccc90一、口、王、田经过□abcd的对角线交点ac=bd且ac⊥bd22cm 与20cm6345°8
练习六:bcabdacd段，平行四边形，正方形，圆形段，角度，正方形，等腰梯形，圆形，等边三角形段，正方形，圆形90ab=cd80228
练习七：bcaaaa有序实数对133(-3，-1)=3≠-2(1，2)(1，-3)(-3，-7)
练习八:bcacbc（3,0）（0,1）（-6/7,9/7）y=x+3S=264-24t-2-1y=x-3y=1/3x-
1/358240
练习九:cbbdcc-19/2y=3x+51433三y=-x-1一、二、四减小xy8x=2，y=7(自己用大括号)512015
练习10：添加B9520310188.1993m+73n+7
练习十一:adbbcdcb2-2325/84(4，-3)y=-5/2xx=-1，y=2(自己用大括号)9±64
以上就是数学。
com已经帮你解决了
初三
上学期的数学寒假作业答案：人民教育版，怎么样？你还满意吗？我希望它能对你的学习有所帮助。
同时，我也祝你学习进步，考试成功！。
【九年级】2021学年九年级上册寒假作业数学答案(参考)
【九年级】2021学年九年级上册寒假作业数学答案（参考）一、选择题1.a2。
d3。
d4。
d5。
c6。
b7。
a8。
b9。
b10。
D二、填空题11.312.13.- 114.=三、15.解：==.16.解：四、 17方程的另一个根是，的值是4。
18.因为a+b=2++2-=4，a-b=2+-(2-)=2，ab=（2+）（2-）=1所以=五、 19解决方案：假设我省每年生产的农作物秸秆总量为a，合理利用的增长率为X 30%a(1+x)2=60%a，即(1+x)2=2‡x1≈ 0.41，X2≈ - 2.41.∴x≈0.41。
也就是说，我省秸秆合理利用的年增长率约为41%。
20.解：(1)∵方程有实数根∴δ=22-4(k+1)≥0解表明K≤ 0，K的取值范围为K≤ 0分（5分）(2)根据一元二次方程根与系数的关系，得x1+x2=-2,x1x2=k+1x1+x2-x1x2=-2+k+1由已知，得-2+k+1-1解得k-2从（1）k≤ 0 - 2.∵k为整数∴k的值为-1和0.(5分)六、 21（1）从主题的意义上，我们可以得到解决方案∴(3分)a点又在函数上，所以解是这样的解方程组得点B的坐标是（1,2）（8点）(2)当02时，y1当1Y2；当x=1或x=2时，y1=y2.(12分)七、 22解：（1）如果宽度为x m，那么x（33-2x+2）=150，解得：x1=10，x2=7.5当x=10时，33-2x+2=1518当x=7.5时，33-2x+2=2021，不合题意，舍去∴鸡场的长为15米，宽为10米。
(5分)(2)设宽为x米，则：x(33-2x+2)=200，X2-35x+200=0δ=(-35)2-4×2×200=1225-16000这个方程没有真正的解，所以养鸡场面积不能达到200平方米。
（9分）(3)当015岁时≤ A20，一个长方形的养鸡场可以围起来；当a≥20时，可以围成两个长宽不同的长方形鸡场;(12分)八、 23（1）图纸（2分）(2)证明：由题意可得：△abd≌△abe，△acd≌△acf.‡∠ DAB=∠ EAB，∠ DAC=∠ fac，以及∠ BAC=45°，∴∠eaf=90°.∵ 公元⊥ 公元前∴∠e=∠adb=90°∠f=∠adc=90°.∵ AE=ad，AF=ad∴ae=af.四边形aegf是正方形（7点）(3)解：设ad=x，则ae=eg=gf=x.∵bd=2，dc=3∴be=2，cf=3∴bg=x-2，cg=x-3。
【九年级】2021年人教版初三上学期物理寒假作业答案
【九年级】2021年人教版初三上学期物理寒假作业答案一、选择题1.b2。
b3。
d4。
d5。
d6。
a7。
c8。
c9。
b10。
B11.abd12.acd二、非多项选择题13.2.80cm;2.8cm14.河岸（青山）；竹排15.物体在一段时间内通过的路程与通过这段路程所用时间的比;物体运动的快慢;米/秒;米每秒;m/s;km/h;1m/s=3.6km/h16.响度；语气音质速度高的17.传递信息;响度18.振动；嗓音19.介质;无线电(波)20.3.13; 4.76; 五点一三第二次多彩的光参考答案一、多项选择题1.a2.c3.d4.c5.a6.a7.8。
阿布德二、非选择题9.3.0 × 108; 漫无目的的10.1.6;2;左右;上下;不变11.折射；空的反射空的12.(略)13.（1）凸透镜中心（2）缩小（3）倒立（4）放大第三次力、力与运动参考答案一、多项选择题1.c2.b3.a4.d5.c6.b7.d8.c9.c10.d11.b12.abc13.acd14.acd15.ad二、非多项选择题16.相互17.增加压力和压力18.4、619.素描20解：(1)g1=m1g=900kg×10n/kg=9×103n(2)∵g=mg∴m2=g2/g=1.5×104n÷10n/kg=1.5×103kg=1.5t第四次密度与浮力参考答案一、多项选择题1.d2.b3.d4.d5.a6.a7.d8.d9.b10.a11.b12.abc13。
abc14。
公元二、非选择题15.不变16.20、竖直向上、上浮17.更小、更大、浮动18.2.7g/cm3、2.7g/cm3以上是物理网络带给你的个人教育版本初三上学期物理寒假作业答案，希望大家能及时关注和了解相关趋势！！！。
英语-2021年江苏省扬州市某校九年级(上)寒假作业测试英语试卷含答案
2020-2021年江苏省扬州市某校九年级（上）寒假作业测试英语试卷一、单选题1. In 2016, ________ China set April 24 as ________ country's Space Day.A a; theB the; theC the; /D /; the2. —Have you asked ________ about the case?—No, except Bob.A everybodyB anybodyC nobodyD somebody3. About ______ of the students in Grade Nine this year were born in the ______.A three-five/1996B three-fifths/1990sC third-fifth/1997D third-fifths/1990s4. —There is still a copy of the book in the library. Will you go and borrow ________? —No. I'd rather buy ________ in the book store.A it; itB it; oneC one; itD one; one5. —________ is the population of India?—It is ________ than ________ of China.A How large; fewer; itB What; smaller; thatC How much; less; thatD How big; smaller; it6. —Can a plane fly ________ the Atlantic Ocean?—Yes. But it needs to go ________ the clouds for hours.A across; throughB through; overC across; acrossD over; in7. My parents gave red packets to my cousin every Spring Festival ________ she got a job, because she said she was able to make money.A afterB whenC untilD since8. —Do you know the boy ________ is sitting next to Peter?—Yes, He is Peter's friend, They are celebrating his ________ birthday.A /; ninethB that; ninethC who; ninthD which; ninth9. —Have you heard of a cool washing machine called Bicycle Washing Machine? —Yes, it's a new ________ by a group of Chinese university students.A inventionB informationC instructionD introduction10. —Is Su Ning fit for the task?—Hang on. I'll tell you ______ what I think of it.A properlyB correctlyC exactlyD highly11. —My car ________. Could you please give me a ride tomorrow?—I'm sorry I can't. I'm ________ London tomorrow morning.A has been broken down; leavingB has broken down; leaving forC broke; leaving forD is breaking; leaving12. —How do you like Guilin?—It's really a beautiful city, and its fantastic landscape ________ me a lot.A expressedB explainedC impressedD complained13. —I'm falling to pieces. Everything is turning against me.—________! I believe you can deal with it.A Cheer upB Be carefulC Calm downD Look out14. My cousin Linda is weak in English. She asked me ________.A how is the best way to learn EnglishB how could she learn English wellC how she can learn English wellD what the best way to learn English was15. —It's not difficult for five workers to push the broken van away.—Yes, ________.A Many hands make light workB When the cat's away, the mice will playC Everydog has its day D Don't put all your eggs in one basket二、完形填空16.After school on Friday, I waited at the school gate to walk home with Jemma, as usual. Then I saw（1）_______ talking and laughing happily with some other girls. She glanced（瞥了一眼）at me and left me alone there. I knew right then that I had（2）_______ my best friend.After dinner, Mom asked, "Is Jemma coming by tomorrow?" I shrugged（耸肩）and said nothing.The next morning, Mom asked, "Today is（3）_______, What are you and Jemma going to do?"I shrugged again. "（4）_______ is Jemma?"Mom took a look at me. Then she said, "Will you take these magazines to Grandma, please?" （5）_______ I walked down the street, a new girl in the neighborhood came towards me, smiling. But I just went（6）_______ her.Grandma welcomed me at the door with a warm hug.Sitting on the sofa, I noticed a（an）（7）_______ of kids in old-fashioned clothes on the table. Grandma pointed at a girl with short fair hair."That's Beth Lambert," she said. "My best friend. Until a week before we took this photo." I was（8）_______ at that."Beth and I were best friends in school. We did everything（9）_______. Then one day, she made new friends and said she didn't want to hang out with me any more. Nothing hurt（10）_______ that."I didn't say anything. I couldn't. I knew I'd start（11）_______ if I opened my mouth. Grandma hugged me again. "Simone, sometimes friends grow（12）________. It might happen to anyone," she continued. "Then, see him?" Grandma's finger（13）_______ to a boy with glasses in the photo. "He lived near me. When I was walking home by myself（14）_______ this boy was, too, I said 'hello'. And we became friends.""So if we want to start a new friendship," she smiled. "One（15）_______ is all it took."As I was heading home, that new girl appeared again. I went towards her and spoke, "Hello."（1）A itB themC herD him（2）A lostB hurtC forgottenD beaten（3）A MondayB FridayC SaturdayD Sunday（4）A HowB WhereC WhichD Who（5）A AsB BeforeC AfterD Until（6）A toB pastC withD against（7）A cardB photoC posterD advertisement（8）A gladB angryC satisfiedD surprised（9）A togetherB outsideC differentlyD quickly（10）A less thanB because ofC more thanD instead of（11）A singingB laughingC shoutingD crying（12）A oldB separateC strongD close（13）A movedB connectedC returnedD waved（14）A soB butC forD and（15）A hugB smileC wordD question三、阅读理解17.The next day, the swallow flew back to the Happy Prince, "I have come to say goodbye," he said. "Little swallow," said the Prince, "will you stay with me just one more night?" "It is winter," answered the swallow, "and the snow will soon be here. In Egypt, the sun is warm,and my friends are waiting for me." "In the town square," said the Happy Prince, "there is a young girl who sells matches. She has dropped her matches onto the ground, and now no one will buy them. Her father will hit her if she does not bring home some money, and she is crying. Take out my other eye and give it to her, and her father will not hit her.""I will stay with you one more night," said the swallow, "but I cannot take out your other eye. You will not be able to see if I do." "Little swallow," said the Prince, "do as I say." The swallow took out the Prince's other eye and dropped the jewel into the match-girl's hand. "What a lovely bit of glass," cried the little girl, and she ran home laughing. Then, the swallow flew back to the Prince. "You can not see now," he said, "so I will stay with you always." "No, little swallow," said the Prince, "You must go away to Egypt." "I will stay with you always," said the swallow, and he slept at the Prince's feet.From The Happy Prince（1）Why was the little match-girl unhappy?A Because she was cold.B Because she was hungry.C Because she could not bring home some money.D Because she hated her father.（2）Why wasn't the swallow willing to promise to do as the Prince said?A If so, the Prince would not be able to see.B If so, the girl's father would hit her.C If so, the Prince would die.D If so, the swallow would not be able to see.（3）Why did the swallow decide to stay with the Prince?A Because he wanted to give love to the poor together with the Prince.B Because his friends did not like him.C Because he had no family.D Because the people in the city disliked him.18.Have you ever paid for educational podcasts（播客）or live videos? Ask some people and most of them will say yes. "Pay-for-knowledge" has been more and more fashionable these years. The contents of these "pay-for-knowledge" products are from language learning to gardening or baby-caring. Everything you think of can be found online at this moment. "Pay-for-knowledge" is on the rise（兴起）.Why is "pay-for-knowledge" industry developing so rapidly? First, its development is based on the Internet. With a fast network and a smartphone, anyone who has passed the identity （身份）check can be an online teacher, and anyone with an online account can buy "pay-for-knowledge" products that he or she wants at an affordable price. Second, people are afraid to miss any information. On one hand, people hope for more useful information.On the other hand, such information is usually at the hands of experts（专家）whoserve well-known companies and universities. Moreover, the need to learn new skills in today's job market also pushes people to learn on such educational podcasts.The industry of "pay-for-knowledge" has proved to be lucrative. It promises possibilities of turning information into money. It is good for the development of our country and it can help sellers make lots of money. Besides, buyers can enjoy self-growth from it. What's more, this is a reflection（反映）of respect for knowledge and talents.However, the rapid development of "pay-for-knowledge" has a few problems. For one thing,the market is full of eye-catching words such as "How to be an Industry's Expert in 5 Hours" and "15 Classes to Be a Master of Appreciating（欣赏）Classical Music", which sound like if you pay for it, you are sure to succeed. For another, a large number of customers buy them just for showing off. In fact, those who have really had self-growth after buying online courses may be the kind of people who need them least. In other words, with or without these courses, they can make it anyway, because they are those who have the ability to learn by themselves.In general, the best is the one that suits you most. "Pay-for-knowledge" may be used asa good start for self-growth. Be careful! Otherwise, your dream of success may not come true.（1）Which of the following is TRUE according to the passage?A "Pay-for-knowledge" products can help all the people succeed.B People must learn from experts who serve famous companies and universities.C People who can teach themselves need "pay-for-knowledge" products most.D "Pay-for-knowledge" products can offer people different kinds of courses.（2）What can we learn about "pay-for-knowledge" industry from Paragraph 2?A The history of its development.B The problems of its products.C The causes of its rise.D The advantages of itsproducts.（3）The underlined phrase "be lucrative" in Paragraph 3 means "________".A enjoy self-growthB get much informationC win great respectD produce lots of money（4）The main purpose of this passage is to ________.A remind people to choose "pay-for-knowledge" products wiselyB advise everyone to learn knowledge by themselves onlineC recommend the "pay-for-knowledge" products to peopleD teach parents how to buy some online courses for their children19.When you're in school, the last thing you want to do is to work on weekends. There's homework to do, sports to play, fun to have. But our parents may persuade（劝说）us to find a job to earn money an get some life experience. When I was a teenager, I had to deliver the newspapers to people's homes. Then I got a Saturday job at a supermarket: putting everything in order on the shelves and working as a shopkeeper.Today in the UK you can work from the age of 13 and many children have part-time jobs. It is almost seen as an adult ceremony. It's an independent experience. Teenagers agreed that it taught them valuable lessons about working and managing money with adults. So that's not a bad thing!Some research suggests that not working on Saturdays or holidays may be harmful to one's later life. But recent statistics（数据统计）show 20% of the students have given up having part-time jobs in the past three years.So does this mean British teenagers are now more afraid of hard work? Probably not. Some experts believe young people feel that going out to work hinders（阻碍）their performance in school, they are now under more pressure（压力）to study hard, get good grades andhave a good job in the long run. However, proper part-time jobs are a great way to help young people learn the skills they need in the workplace. In fact, the key is to keep a balance between taking a part-time job and having enough time to study and rest.Many young people actually want to work because it gives them a sense of freedom. A 13-year-old girl named Rachel works in a shop on Saturday. She told the BBC: I like my job because I'm making money and it helps me to talk to people confidently and work with others closely. It seems like a valuable thing to do on a Saturday morning.（1）When I was a teenager, I ________ at first.A had too much homework to doB played sports with my good friendsC delivered food to people's homesD had a part-time job on Saturday（2）What makes some students give up part-time jobs?A They are now more afraid of hard work.B Taking part-time jobs may be harmful to their later life.C Going out to work hinders their performance in school.D Taking part-time jobs isn't a great way to help them learn skills.（3）Rachel likes her part-time job because ________.① She can make some money.② She can get good grades.③ It helps her talk with people confidently.④ It helps her get away from pressure.A ①②B ③④C ①③D ②④（4）The writer's purpose in writing the passage is ________.A To introduce his own part-time job experience.B To encourage students to take apart-time job. C To tell students how to keep a balance between study and jobs. D To make a survey on part-time jobs.20.Many people complain about their bad memory, especially when they are older. How can we improve our memory?Many people think that repeating things is the best way to remember them. While this undoubtedly helps short-term memory (remembering a telephone number for a few seconds, for example), psychologists（心理学家）doubt whether it can help you remember things for very long. The British psychologist E. C. Stanford seemed to prove this point when he tested himself on five prayers（祈祷文）that he had read aloud every morning for over 25 years. He found that he could remember no more than three words of some of them! More helpful, especially for remembering numbers, is grouping the information. The following numbers would be impossible for most of us to remember: 1492178919931848. But look at them in chunks, and it becomes much easier: 1492 1789 1993 1848.According to experts, there are many ways of training your memory. Many of them involve forming a mental picture of the things to be memorized. One method, which may be useful in learning foreign languages, is to create a picture in your mind connected to a word you want to remember.Another method is to invent a story that includes all the things you want to remember. In experiments, people were asked to remember up to 120 words using this skill; when tested afterwards, on average, they were able to recall 90% of them!However, not all of us are interested in learning long lists of names and numbers just for fun. For those studying a large amount of information, psychologists suggest that the best way to form meaningful connections is to ask yourself lots of questions as you go along. So, for example, if you were reading about a particular disease, you would ask yourself questions like: "Do people get it from water?", "What parts of the body does it influence?" and so on. This is said to be far more effective than time spent "passively" reading and re-reading notes.（1）Which of the following is TRUE about repeating things according to the passage?A It helps short-term memory for sure.B It makes remembering thingsinteresting. C It helps to remember things for long. D It makes remembering prayers effortless.（2）The underlined word "chunks" in Paragraph 2 probably means "________".A detailsB turnsC groupsD lines（3）What can we infer from the passage?A Creating a picture is useful in learning Maths.B Inventing a prayer trains our memory quickly.C Remembering long numbers is easy for people.D Asking yourself questions activates the memory.（4）What's the writer's main purpose in writing this passage?A To complain that his memory is bad.B To recognize some memory problems.C To explain some memory experiments.D To share some ways of improving memory.四、词汇运用21. 根据句子意思填空（每空一词）。