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高一语文限时练答案

高一语文限时练答案

高一语文限时练1参考答案1.考据学对作者生平也很重视。

2.B3.(1)用死纪律来限制活作品。

(2)所持的是“批评的态度”,这种态度是冷静的,不杂情感的;是一种反省的理解;预存美丑的标准,把自己放在作品之外去评判它的美丑。

4.C5.B6.相同点:注重自我的情感和物的姿态的交流。

欣赏的态度忌杂有任何城建,把自我放在作品里面去分享它的生命。

不同点:印象派主张文学批评应当是艺术的、主体的,各人应以自己的嗜好为标准。

欣赏的态度全凭直觉。

作者认为内行与外行的印象得出的价值未必相同,除直觉外,还要能说出觉得好的道理。

7.这个比喻,将“一双脚站在干涸的湖底的时候的”感觉比喻为“自己踩在了自己的骨头上”的感觉,十分形象逼真,具有很强的表现力。

自己踩在了自己的骨头上,不光是疼痛的感觉,还有因为是自己的骨头而有痛心悔恨的心理;而一双脚站在干涸的湖底的时候,同样不仅有脚底的疼痛,更有因为这湖的干涸是人类自己行为造成的而产生的悔恨心理。

8.①同眼前所见形成强烈对比,巨大的反差能给读者心灵造成震撼;②很好地印证了文章的开头,使开头的比喻更真切,更有说服力;③抒发作者内心的感情,更好地表现作品的主旨。

9.①这些数据之间存在着较大的差距,这些年份之间却间隔较短,②这就能让读者能具体地感受到环境遭受破坏的程度之深和速度之快,③从而很好地表达作者的情感之深,④让读者产生深刻的印象和强烈的共鸣。

10.①“殇”的本意是指没有到成年就死去。

现代常用于指重大的灾难事故或心理上的剧烈悲痛创伤或事件所折射出的巨大的悲哀遗憾等。

②“湖殇”意思就是因为湖的消亡而感到的悲哀遗憾。

③本文以“湖殇”为题,准确地揭示了文章的内涵,飙到了作者的感情。

11.这几段在语言运用上主要有下列特点:①运用排比的修辞手法(如“那些缭绕碧波的绿茵,那些水中游戏的鱼鸟,那些湖面泛舟的渔人,那些环湖晚炊的村庄”),使作者的感情表达得更悲痛、更强烈,使文章的语气更通畅,更流利;②运用拟人的手法,将艾比湖比拟为人,从而让读者将心比心,更真切地体会环境遭受破坏的严重性,更强烈的表达作者对破坏环境者愤怒;③运用比喻的修辞方法,将那些盲目赞美艾比湖的文章比喻为“对着一个病入膏肓的人,赞美她美丽的服饰和迷人的发髻,不知道在鱼缸里长大的鱼,会不会朗诵有关海的诗句”,委婉地对这些文章进行批评;④运用联想的方法,由此及彼,由人联想到鸟,联想到鸟面临的灾难,使环境被破坏的恶劣影响更加具体可感,增强了文章的感染力。

限时练活动方案

限时练活动方案

限时练活动方案1. 活动目标本次限时练活动旨在提高参与者的技能水平,并通过限时竞赛的形式激发其学习和实践的动力。

通过参与活动,参与者将有机会结交志同道合的伙伴,并获得专业人士的点评和指导,从而达到个人技能提升的目标。

2. 活动规则2.1 活动时间本次限时练活动将在指定日期内举行,共计持续一周时间。

具体的活动时间如下:•开始日期:[请填写具体日期]•结束日期:[请填写具体日期]2.2 报名条件本次活动对参与者没有限制,任何对提升自身技能有兴趣的人都可以报名参加。

2.3 活动内容本次限时练活动将采取项目驱动的形式,参与者需要根据活动发布的题目,完成相应的技术任务。

具体内容如下:•每天活动组织方会发布一个新的题目•参与者需要在规定时间内完成题目并提交答案•每个题目会有相应的难度等级,参与者可以根据自己的实际情况选择难度级别•参与者可以自行选择编程语言和开发环境•每个题目的答案可以是一个代码实现、一个文档解答等形式2.4 提交方式参与者需要在规定的时间内将完成的答案提交给活动组织方。

具体的提交方式如下:•将答案以 Markdown 文本格式提交到指定的代码托管平台或邮件地址•提交的文件命名规则为:题目编号-参与者姓名.md2.5 评估与奖励活动结束后,活动组织方将对参与者的答案进行评估,并根据评估结果进行打分。

评估标准如下:•代码实现的正确性•代码质量与可读性•算法和思路的合理性•有效性及完整性的文档解答根据评估结果,组织方将给予参与者相应的奖励或认可,具体奖励方式将在活动结束后公布。

3. 活动准备参与者需要做以下准备工作:•确保自己具备完成题目所需的技术基础•确认自己拥有可以使用的开发环境和工具•保证网络连接稳定,以便及时获取活动信息和提交答案4. 活动宣传与报名活动组织方将通过各种渠道进行活动的宣传和报名工作,包括但不限于:•在社交媒体平台发布活动信息•在技术论坛和社区发布活动信息•通过电子邮件邀请感兴趣的人参加活动参与者可以通过官方发布的渠道进行报名,具体报名方式将在宣传时公布。

限时练25

限时练25

金华市外国语学校2025届信息技术限时练25一、选择题(本大题共10小题,每小题2.5分,共25分。

每小题列出的四个备选项中只有一个是符合题目要求的,不选、多选、错选均不得分)1.下列算式计算结果为10H的是A.1H×10DB.9H+1HC.20D10BD.10B×8D2.某完全二叉树共有300个节点,该二叉树的高度是A.8B.9C.10D.11阅读下列材料,回答第3至第5题:某超市智能管理系统的部分功能是:系统可以实时更新商品库存信息,预测未来一段时间内的销售趋势,帮助超市调整进货策略;同时智能推送信息到客户端APP,顾客可通过客户端购买商品。

为了保障系统的安全性和稳定性,该系统配置了硬件防火墙和不间断电源。

3.下列关于该信息系统的说法,正确的是A.该系统的用户只有顾客和店员B.该系统的客户端软件属于系统软件C.该系统软件开发架构一定是B/S架构D.该系统配置的不间断电源属于信息系统硬件4.下列关于该系统中数据的说法,正确的是A.该系统中存储的数据是大数据B.商品的库存数据都存储在客户端中C.该系统预测的销售趋势一定是准确的D.查询某商品的库存数量属于数据查询功能5.下列关于该信息系统安全的说法,正确的是A.为所有员工设置相同的权限B.该信息系统采用了软件防火墙技术C.定期备份服务器中的数据,可以提高系统的安全性D.为了方便后期的升级和维护,可以给系统设置后门6.队列Q从队首到队尾的元素依次为1,2,3,4,栈S初始为空。

约定:H操作是指元素出队后入队,T操作是指元素出队后入栈。

经过HTTHT 操作后,栈S中从栈底到栈顶的元素依次为A.1,2,4B.2,3,1C.3,1,2D.4,2,17.有如下Python程序段:#随机产生5个整数,存储在列表a中for i in range(1,5):k=a[i]j=i1while j >= 0 and abs(a[j]2)>abs(k2):a[j+1]=a[j]j=1a[j+1]=k执行该程序段后,列表a的值可能是A.[5,2,4,0,1]B.[3,1,0,2,3]C.[1,2,3,4,5]D.[0,4,0,2,4]8.有如下 Python 程序段:s="abaabcaab"st=s[0]i=1while i<len(s):if len(st)==0 or s[i]!=st[1]:st=s[i]+stelse:st=st[0:len(st)1]i+=1执行该段代码后,st的值为A. bcaB. acbC. bacD. cab9.定义如下函数:def fac(n):if n==1:return 1else:return 1/n+fac(n1)执行语句12.使用列表a模拟链表结构(节点数大于0),每个节点包含数据区域和指针区域,head为头指针。

新高考英语阅读理解限时练(含答案详解)

新高考英语阅读理解限时练(含答案详解)
There is no doubt that human activities have contributed a lot to social and economic development, but for our own benefit, we humans had better not push nature too hard, or we will have to pay a price.
Building large dams can also cause earthquakes. Many people died as a result of a big earthquake caused by millions of tons of water that had been collected in a reservoir after a large dam was built over a known fault line.
Meals Allergies (过敏) Special Dietary Requlrements
Students are provided with breakfast, dinner and either a cooked or packed lunch, which includes a sandwich, a drink and a dessert. We request that you let us know of any allergies or dietary requirements and information about any medicines you take. Depending on the type of allergies or dietary requirements, extra money may be needed for providing special food.

高三数学题限时练习题

高三数学题限时练习题

高三数学题限时练习题第一题:已知函数f(f)=ff^2+ff+f,其中f,f,f为常数,且f≠0。

已知当f=2时,f(f)=3;当f=1时,f(f)=1。

请回答以下问题:1. 根据已知条件,列出函数f(f)的方程式。

2. 求函数f(f)的导函数f′(f)。

3. 若函数f(f)的极值点为f=−1,求函数f(f)在f=−1处的极值。

解答:1. 假设函数f(f)的方程式为f(f)=ff^2+ff+f。

由已知条件可以得到如下方程组:3 = 4f+2f+f (1)1 = f+f+f (2)解方程组 (1) 和 (2),可以得到f=1,f=-1,f=3。

因此,函数f(f)的方程式为f(f)=f^2−f+3。

2. 函数f(f)的导函数f′(f)可以通过求函数f(f)的变化率来得到。

根据导数的定义,有:f′(f) = lim(f→0) (f(f+f)−f(f))/f对函数f(f)=f^2−f+3进行求导,得到:f′(f) = 2f−1所以,函数f(f)的导函数f′(f)为2f−1。

3. 函数f(f)的极值点为f=−1,可以通过求导数为0的点来求得。

令f′(f)=0,有:2f−1 = 0解方程得到f = 1/2。

即函数f(f)在f=−1处的极值为f=1/2。

第二题:已知函数f(f)=f^3+ff^2+ff+f,其中f,f,f为常数。

请回答以下问题:1. 当f=2时,f(f)=1;当f=1时,f′(f)=2。

根据已知条件,列出函数f(f)的方程式以及函数f(f)的导函数f′(f)的方程式。

2. 求函数f(f)的导函数f′(f)的导函数f′′(f)。

3. 若函数f(f)的极值点为f=−1,求函数f(f)在f=−1处的极值。

解答:1. 假设函数f(f)的方程式为f(f)=f^3+ff^2+ff+f。

根据已知条件可以得到如下方程组:1=8+4f+2f+f (1)2=3+2f+f (2)解方程组 (1) 和 (2),可以得到f=-2,f=3,f=-4。

限时训练刷题练习册

限时训练刷题练习册

限时训练刷题练习册一、选择题1. 下列哪个选项是正确的数学表达式?A. 2 + 3 = 5B. 3 × 4 = 12C. 4 ÷ 2 = 6D. 5 - 1 = 3答案:A2. 请从下列选项中选出正确的英语单词拼写。

A. colerB. colorC. collerD. cooler答案:B3. 以下哪个历史事件标志着第二次世界大战的结束?A. 珍珠港事件B. 诺曼底登陆C. 广岛原子弹爆炸D. 柏林墙倒塌答案:C二、填空题1. 地球的自转周期是 ________ 小时。

答案:242. 请填写下列化学元素的符号:铁 ________,氧 ________。

答案:Fe,O3. 根据题目要求,以下句子中缺少的单词是 ________。

- 句子:I am ________ to help you.答案:willing三、简答题1. 请简述牛顿第三定律的内容。

答案:牛顿第三定律指出,对于两个相互作用的物体,它们之间的作用力和反作用力大小相等,方向相反。

2. 请解释什么是光合作用,并简述其过程。

答案:光合作用是植物、藻类和某些细菌利用光能将水和二氧化碳转化为葡萄糖和氧气的过程。

这个过程主要发生在叶绿体中,分为光反应和暗反应两个阶段。

光反应产生ATP和NADPH,暗反应则利用这些能量和还原力将二氧化碳固定并转化为有机物。

四、计算题1. 如果一个圆的半径是5厘米,求这个圆的面积。

答案:圆的面积公式是A = πr²,代入 r = 5 厘米,得到 A = π × 5² = 25π ≈ 78.54 平方厘米。

2. 一个班级有40名学生,其中25名男生和15名女生。

如果随机选择一名学生,求选中男生的概率。

答案:选中男生的概率是男生人数除以总人数,即 P(男生) = 25/40 = 5/8。

结束语本练习册旨在帮助学生通过限时训练提高解题速度和准确率。

希望同学们能够认真完成每一道题目,不断提升自己的学习水平。

限时练一(教师版)

限时练一(教师版)

2013-2014学年度襄阳36中学校语文限时练(教师版)1.依次填入下列句中横线处的词语,最恰当的一项是①为创建国家园林城市,我市有关部门及时地拆除清理了一些已被的公共设施,确保了城区交通的畅通。

②结束了一个学期紧张的学习生活,心情终于可以下来,我要好好地听听我喜欢的音乐。

③在“中国农谷•荆门(沙洋)第五届油菜花旅游节”上,“农家乐杯”的文艺比赛充分了荆门人“乐在农家”的精神风貌。

A.废置迟缓显示 B.废止迟缓显示C.废置弛缓展示 D.废止弛缓展示【答案】C2.下列各句中,没有语病的一句是A.上海影评界最权威的组织之一上海电影评论学会曾公布“影响中国电影进程和我们生活”的22部影片名称,《渔光曲》《祝福》《手机》等影片均列其中。

B.考上音乐学院不久,小李认识了高教授,受到这位饮誉海内外的声乐教授的赏识,小李心中充满了“相逢何必曾相识”的感觉。

C.孔子并没有直接提到人之性善或性恶,《论语》中“仁”字出现了大约66次左右,但没有任何两个地方的解释完全相同。

D.使我感到欣慰的是,仪器成功产生了比地磁场强两万多倍的磁场,而这正是加速一束电子所必需的。

【答案】D5.下列各句中,加点的词语使用不正确...的一句是()A.科特迪瓦前总统巴博在选举失败后仍不交权,违背国内民意和国际舆论,以致陷入四面楚歌....的境地。

B.这个人心术不正,专爱干勾心斗角....的勾当,没有人愿意接近他。

C. 如果只为了一点小小的成就便踌躇满志....,不但得不到别人的赞美,反而遭人们嗤之以鼻。

D .我们看问题要有系统论的观念;那种只见树木不见森林、只见部分不见整体目无全牛....的思维方式是不可取的。

【答案】D(A“四面楚歌"比喻四面受敌,孤立无援。

B“勾心斗角”本意为宫室建筑的内外结构精巧严整,后人用它比喻各种心机,明争暗斗。

含贬义。

C“踌躇满志”形容形容对自己取得的成就非常得意。

D“目无全牛”比喻技艺或处事能力纯熟高超。

对限时练进行总结

对限时练进行总结

对限时练进行总结1. 引言限时练是一种提高工作效率和时间管理能力的方法。

通过设置时间限制,可以帮助人们更好地集中精力完成任务,避免拖延和浪费时间。

本文将对限时练进行总结,探讨其优点、使用技巧和适用场景。

2. 限时练的优点2.1 提高注意力和集中精力限时练迫使人们集中注意力并全神贯注于任务,从而提高工作效率。

时间限制下的紧迫感,可以激发人们的专注力和积极性。

2.2 避免拖延和时间浪费许多人面临的一个常见问题是拖延。

通过限时练,人们可以设置一个明确的时间段用于完成任务,避免无谓的时间浪费和拖延行为。

2.3 增强时间管理能力限时练可以培养人们的时间管理技巧。

通过设定时间限制并尽力在规定时间内完成任务,人们可以更好地掌握时间,提高自己的时间管理能力。

2.4 快速决策和问题解决能力在限定的时间内完成任务,迫使人们快速做出决策和解决问题。

限时练可以帮助人们提高应对紧急情况和时间压力的能力。

3. 使用技巧3.1 设定合理的时间限制在使用限时练时,设定合理的时间限制非常重要。

时间限制应该具有挑战性,但同时也要考虑到任务的复杂性和自身的能力。

合理的时间限制可以激发人们的潜能并促使其高效完成任务。

3.2 划分任务优先级在限时练中,划分任务优先级可以帮助人们更好地管理时间和精力。

将任务按重要性和紧急性进行分类,并根据时间限制安排优先完成的任务。

3.3 掌握专注力技巧专注力是限时练成功的关键因素之一。

掌握一些专注力技巧可以帮助人们更好地集中精力完成任务。

例如,关闭手机通知、清理工作区、使用番茄钟等方法都可以提高专注力。

3.4 适当休息和调整在限时练中,适当的休息和调整也是重要的。

长时间的高强度工作容易造成疲劳和注意力涣散。

设置合理的休息时间和调整方式,可以有效地提高工作效率。

4. 适用场景4.1 工作任务限时练对于繁忙的工作环境非常适用。

通过设定时间限制,可以帮助人们快速高效地完成工作任务,提高工作效率和产出。

4.2 学习和考试在学习和考试过程中,限时练也具有重要意义。

40分钟限时练习5-挑战2023年中考数学基础满分训练(原卷版)

40分钟限时练习5-挑战2023年中考数学基础满分训练(原卷版)

40分钟限时练习(5)一.选择题(共8小题,满分24分,每小题3分)1.(3分)下列各数中,比﹣4小的数是()A.﹣2.5B.﹣5C.0D.22.(3分)如图所示的几何体,它的左视图是()A.B.C.D.3.(3分)下列计算正确的是()A.a2+a3=a2B.a3•a3=a9C.(a3)2=a6D.(ab)2=ab24.(3分)若关于x的方程x2+mx﹣2n=0的一个根是2,则m﹣n的值是()A.﹣2B.2C.﹣4D.45.(3分)已知⊙O的半径为3,点P在⊙O外,则OP的长可以是()A.1B.2C.3D.46.(3分)甲、乙、丙、丁四位选手各进行了10次射击,射击成绩的平均数和方差如表:选手甲乙丙丁平均数(环)9.09.09.09.0方差0.251.002.503.00则成绩发挥最稳定的是()A.甲B.乙C.丙D.丁7.(3分)如图,在矩形ABCD中,点C的坐标为(2,3),则BD的长为()A.3B.3√2C.√13D.48.(3分)如图是某商场到地下停车场的手扶电梯示意图,其中AB、CD分别表示地下停车场、商场电梯口处地面的水平线,∠ABC=135°,BC的长约是5√2m,则乘电梯从点B到点C上升的高度h是()A .5√22mB .5mC .52mD .10m二.填空题(共8小题,满分32分,每小题4分)9.(4分)要使分式x+1x−4有意义,则x 的取值应满足 .10.(4分)请你写一个能先提公因式,再运用公式来分解因式的三项式,并写出分解因式的结果 .(答案不唯一)11.(4分)大量事实证明,环境污染治理刻不容缓,据统计,全球每秒钟约有19.2万吨污水排入江河湖海,把19.2万吨用科学记数法表示为 吨.12.(4分)已知a +b =5,ab =3,b a +a b = .13.(4分)小虎同学在解方程组{y =kx +b y =3x的过程中,错把b 看成了6,其余的解题过程没有出错,解得此方程组的解为{x =−2y =−6.又已知直线y =kx +b 过点(1,﹣8),则b 的值为 . 14.(4分)菱形的周长是40cm ,两邻角的比是1:2,则较短的对角线长 .15.(4分)一副三角板如图所示放置,已知斜边互相平行,则∠1的度数为 .16.(4分)如图,在△ABC 中,∠ACB =90°,BC =3,以点C 为圆心的圆与AB 相切,⊙C 的半径为2.4,则AB = .三.解答题(共4小题,满分44分)17.(10分)计算:(1)√−83+√(−1)2−√643×√14;(2)√(−4)2−√−13+√102−62.18.(10分)解方程:(1)2x+1−1x=0;(2)x−2x+2−16x2−4=1.19.(12分)从一副扑克牌中取出红桃J、Q、K和黑桃J、Q、K这两种花色的六张扑克牌,将这三张红桃分为一组,三张黑桃分为另一组,分别将这两组牌背面朝上洗匀,然后从这两组牌中各随机抽取一张,请利用列表或画树状图的方法,求其中一张是J,另一张是Q的概率.20.(12分)如图,在平行四边形ABCD中,点O是对角线AC中点,过点O作EF⊥AC分别交边AB,CD于点E,F.(1)求证:四边形AECF是菱形;(2)当AF平分∠CAD时,且CF=5,DF=2,求AD的值.。

《登泰山记》限时练

《登泰山记》限时练

《登泰山记》一、挖空练习泰山之阳.( ),汶水西.()流;其阴.(),济水东流。

阳谷..()皆入汶,阴谷皆入济。

当.()其.()南北分者,古长城也。

最高日观峰,在长城南十五里。

余以.()乾隆三十九年十二月,自.()京师乘.()风雪,历.()齐河、长清,穿泰山西北谷,越长城之限.(),至于..()泰安。

是.()月丁未,与知府朱孝纯子颍由南麓登。

四十五里,道皆砌石为磴.(),其级七千有.()余。

泰山正南面有三谷。

中谷绕泰安城下,郦道元所谓环水也。

余始循.()以()入,道少半,越中岭,复.()循西谷,遂至其巅.()。

古时登山,循东谷入,道有天门。

东谷者,古谓之天门溪水,余所不至也。

今所经中岭及山巅崖限当道者.....(),世皆谓之天门云。

道中迷雾冰滑,磴几.()不可登。

及.()既.()上,苍山负.()雪,明烛.()天南;望晚日照城郭,汶水、徂徕如画,而半山居.()雾若带然。

戊申晦.(),五鼓.(),与子颖坐日观亭,待日出。

大风扬积雪击.( )面。

亭东自足下皆云漫.()。

稍.()见云中白若摴蒱数十立者...........,山也()。

极天.()云一线异色,须臾成五采.()。

日上,正赤如丹,下有红光,动摇..()承之。

或曰,此东海也。

回视日观以西峰,或.()得日,或否,绛.()皓.()驳.()色,而皆若偻()。

亭西有岱祠,又有碧霞元君祠;皇帝行宫..()在碧霞元君祠东。

是.()日,观道中石刻,自唐显庆以来,其远古刻尽漫失..()。

僻不当.()道者,皆不及.()往。

山多石,少土;石苍黑色,多平方..(),少圜.()。

少杂树,多松,生石罅.(),皆平顶。

冰雪,无瀑水,无鸟兽音迹。

至日观数里内无树,而雪与人膝齐。

桐城姚鼐记。

二、知识总结词类活用1.汶水西.流()2.济水东.流()3.下.有红光()4.明烛.天南()5.崖限.当道者()古今异义1.越长城之限,至于..泰安()2.多平方..,少圜()特殊句式1.当其南北分者,古长城也。

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-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.。

高中英语必修三 Unit1 限时练-经典教学教辅文档

高中英语必修三 Unit1 限时练-经典教学教辅文档

Unit 1 Art工夫:60分钟满分:125分一、单词拼写(每词1分,满分50分)根据汉语或首字母提示填出本单元所学单词。

1.(北京高考完形填空改编)If they run out of certain daily necessities, Wilson will drive to the nearest store and p_________what's needed.2. Confucius is regarded as one of the most_______________(有影响的)figures in Chinese history.3.(全国Ⅲ卷语法填空改编)In ancient China lived an artist whose paintings were almost lifelike. The artist's_______________(名誉)had made him proud.4. Over the past 30 years evidence has_________(出现)that the forests have been affected by climate change.5. —The hill village remains _______(原始的) and unspoiled(未遭破坏的).—That explains why people desire to explore such a remote place. 6.Relatives and friends gave their best wishes to theb______________and bridegroom.7.Tom was c____________by Mr Smith because he didn't arrive on time.8.Rodin is thought to have made a big contribution to modern_______________(雕塑)9.Calligraphy, which has a long history,is_____________(视觉的)art related to writing.10.The young could suffer __________(永世的)hearing loss if they listen to music at full volume for more than five hours a week. 11.The actor many people were fond of gave a great performance,but he was very _______(谦逊的).12.They suggested building a __________(纪念碑)in memory of the heroes who died in the rescue activity.13.Many of us regard reading as an __________(投资)in ourselves, so it is natural that we want to learn something useful in return for our effort.14.China's e____________into the World Trade Organization makes a big difference to the world economy.15.It's also helpful to learn something about the museum in advance,such as its_____________(博览会)and activities.16. He has gained global____________(赞誉)for his artistic talent.17.(河北衡水中学模考)The mountain's deep valleys and diverse wildlife will___________(确保)you wonderful scenery and a fantastic hiking experience.18.(浙江高考浏览理解改编)The number of trees larger than twofeet across has___________(减少)by 50 percent on more than 46, 000 square miles of California forests.19. I felt lucky to be chosen as a____________(代表)of our school and join in the cultural tour of Pompeii.20. From ____________(青铜) bowls to ceramic ______________(花瓶), and jade sculptures to ink wash paintings, our goal is to display the Chinese _______________(艺术的) genius from ancient times.21. Born during the Ming Dynasty, Tang sought and failed to gain ____________(参与) into the ____________(国民的) service, so he turned to painting instead.22. In time, he gained ___________________(承认) as one of the greatest artists China has ever known.23. Even though Buddhism entered China much earlier, it did not really begin to show ______________(扩大) until the seventh century.24. If you are not interested in works of art by classical masters, ____________________(当代的) art by emerging artists is also w_____________ of your attention.25.In the art market, no one can _______________(保证) that an artist will be a good i________________.在空白处填入括号内单词的正确方式。

限时训练对教学的作用和意义

限时训练对教学的作用和意义

限时训练对教学的作用和意义随着社会的发展和竞争的加剧,教育也在不断改革和创新。

限时训练作为一种新型的教学方式,逐渐受到教育界的重视。

它通过给学生设置一定的时间限制,让学生在有限的时间内完成任务或解决问题,以达到提高学生学习效率和能力的目的。

限时训练在教学中发挥着重要的作用和意义。

限时训练可以培养学生的时间管理能力。

在限时训练中,学生需要在规定的时间内完成任务,这要求学生具备良好的时间管理能力。

学生需要合理安排时间,合理分配任务,提高工作效率。

通过不断的实践和训练,学生可以逐渐养成良好的时间管理习惯,提高自己的学习效率。

限时训练可以激发学生的学习兴趣和积极性。

限时训练的设置可以增加学习的紧迫感和挑战性,激发学生的学习兴趣和积极性。

学生会因为时间的限制而对任务充满了探索和挑战的欲望,他们会更加专注和投入到学习中。

这种积极的学习状态将促进学生的学习效果和学习动力。

限时训练可以培养学生的应对压力和解决问题的能力。

限时训练给学生提供了一个模拟的压力环境,让他们在有限的时间内解决问题。

在这个过程中,学生需要快速思考,迅速分析问题,找出解决方案。

通过不断的训练,学生可以提高自己的思维能力和应对压力的能力,培养解决问题的能力。

限时训练还可以帮助学生提高自我调节和自律能力。

在限时训练中,学生需要按时完成任务,这要求他们具备良好的自我调节和自律能力。

学生需要控制自己的情绪和行为,合理安排时间,专注于任务。

通过不断的实践和训练,学生可以逐渐养成自律的习惯,提高自己的自我调节和自律能力。

限时训练对教学具有重要的作用和意义。

它可以培养学生的时间管理能力,激发学生的学习兴趣和积极性,培养学生的应对压力和解决问题的能力,提高学生的自我调节和自律能力。

因此,在教学中应该充分发挥限时训练的优势,合理运用限时训练,以提高学生的学习效果和能力。

同时,教师也应根据学生的实际情况和需要,合理设置限时训练的任务和要求,以达到更好的教学效果。

人教版初中英语七年级下册限时练Unit2 Period1

人教版初中英语七年级下册限时练Unit2 Period1

Unit 2 What time do you go to school? Period 1班级:姓名:小组:__________Ⅰ.单项选择1. David eats _______ lunch at school and he always has _______ good lunch.A. the; aB. 不填; theC. the; theD. 不填; a2. We can see many stars _______ night here. A. in B. at C. on D. of3. —It’s 9:50, right?—Yes, it’s ____. A. ten past nine B. ten to nine C. ten past ten D. ten to ten4. When ____ your mother take a shower? A. does B. is C. do D. are5.My father often ______ home at six o’clock in the evening. A. go B. gets C. goes to D. gets to6.My brother often goes to ___school after ___breakfast. A. /; the B. the; the C. the; / D. /; /7.Anna and her brother usually do ____ homework at 8:00 p.m. A. his B. her C. our D. their8.—______ does your father go to work every day?—He goes to work at half past six.A. HowB. WhatC. What timeD. How time9. —What time do you usually go to bed? —_______ nine o’clock.A. AtB. OnC. InD. of10. Tina wants to take ____ shower after playing ___ soccer. A. a; the B. the; the C. a; / D. the; /11.Please tell me something _______ your new teacher. A. in B. for C. about D. on12.There are sixty minutes in ______ hour. A. a B.an C./ D. the13.—Do you know the______?—Yes, it’s 10:30. A.age B. time C. number D. address14. What do you usually do ______ Sunday morning? A. to B. at C. on D. in15. Ice-cream is unhealthy, so I ____ eat it.A. alwaysB. usuallyC. sometimesD. never16. —What does your mother do to keep healthy, Tim? —She usually ______.A. swimB. swimsC. is swimmingD. to swim17. What time does Jane _______ after school?A. do her homeworkB. does her homeworkC. do her homeworksD. does her homework18. —Are you often late for school ,Tom? —No, ____,I get to school early.A. alwaysB. usuallyC. sometimesD. never19. I like to have some vegetable and chicken _____ lunch. A. for B. to C. of D. at20. We should do exercise because it ___us. A. is good for B. is good to C. is bad for D. is bad to21. It’s twelve o’clock. It’s time to have ____. A. breakfast B. lunch C. dessert D. dinner22. I don’t know his address. Please ________ me about it. A. say B. tell C. speak D. listen to23. —______ do you usually play the violin?—On weekends.A. What timeB. WhyC. WhereD. When24.—What’s the English for 9:50? —It’s ______.A. nine fiftyB. fifty nineC. ten to nineD. ten past nine25. I ______ watch so I don’t know the time.A. don’t have aB. have notC. not have aD. have no a26. Tom has ______ breakfast every morning. And he always eats ______ good breakfast. A. the; the B. 不填; a C. the; a D. 不填; the27. Mary gets up early every morning, so she’s _____ late for school.A. usuallyB. neverC. alwaysD. often28.Sam often goes to school _____ seven thirty. A. on B. at C. in D. for29.—What time is it ? —_____.A. It’s May 1stB. It’s a clockC. It’s seven o’clockD. It’s my birthday30. —When do you _____ home? —At around 6:00 . A. to get B. get C. get to D. gets Ⅱ. 完形填空My sister is a good 1. She is twenty-one years old. She drives a car in a 2. She 3 from Sunday to Friday. Her home isn’t4the factory. She gets up5at six. She goes to work at 6:30.67:30, she must get there. She has7in the factory. She has lunch there ,too. She8 the factory at 5:00 in the afternoon. She cooks and then does housework in the evening. She likes9 very much. She likes watching TV10. She goes to bed at about 10:30 p.m..1. A. worker B. bus driver C. taxi driver D. doctor2. A. shop B. hospital C. factory D. farm3. A. studies B. buys C. comes D. works4. A. for B. in front C. out D. near5. A. early B. late C. not D. before6. A. After B. At C. Between D. Late7. A. something B. breakfast C. food D. nothing8. A. gets B. arrives C. leaves D. drives9. A. reading B. to read C. read D. seeing10. A. very much B. little C. a little D. a fewIII.阅读理解ABob works in an office. Every morning he has breakfast at seven thirty, reads his newspaper, drinks a cup of coffee and then goes to work. One morning he is still at the table and reading his newspaper at 8 o’clock. He asks wife for another cup of coffee. His wife asks him, “Aren’t you going to the office today?” “ The office?” He jumps up from his chair, “ I think I am in the office.”1. Bob is ________.A. a bus driverB. an office workerC. a primary school teacherD. a waiter2. Bob ______ before he goes to work.A. has breakfastB. reads his newspaperC. drinks a cup of coffeeD. A, B and C3. Bob ______ this morning.A. can go to work lakeB. must go to workC. doesn’t go to workD. should go to work early4. Bob _______ this morning.A. has a cup of coffee at homeB. has two cups of coffee at homeC. has a cup of coffee in his officeD. has two cups of coffee in his office5. Bob thinks ________.A. today is SundayB. he is in the officeC. he works very hardD. he is at homeBJenny gets up early in the morning.She has her breakfast and goes to school.She walks to the bus stop and takes a bus.She gets to school at about half past seven.Jenny is never late for school.She likes school and works hard.Classes begin at 8:00.She has six classes every day.Jenny is good at all her lessons,and she likes English best.Usually Jenny has lunch at school.She goes home at five in the afternoon.Sometimes,she helpsher friends with their lessons.After supper she usually watches TV news.Then she does her homework.She goes to bed at about 9:30.Jenny is a good girl.( )1. Where does Jenny have her breakfast?A. She has her breakfast at home.B. She has her breakfast at school.C. She has her breakfast in restaurant.D. She has her breakfast on the bus.( )2. How does Jenny do at her lessons?A. She doesn’t like going to school.B. She can’t do her lessons.C. She does very well in her lessons.D. She doesn’t know her lessons at all.( )3. How many hours is Jenny at school?A. She is at school for seven hours.B. She is at school for seven and a half hours.C. She is at school for eight hours.D. She is at school for nine and a half hour.( )4. What does Jenny sometimes do after school?A. She has supper with her classmates at school.B. She helps her friends with their lessonsC. She does some shopping for her mother.D. She goes home with her friends.( )5. What does Jenny do after supper?A. She watches TV and then goes to bed.B. she watches TV and does some housework.C. She watches TV and does her homework.D. She reads her English and does some sports.Ⅳ.句子翻译1.你什么时候穿衣服?What time do you _____ ______?2.我通常在六点四十沐浴。

适用于新高考新教材2025版高考数学二轮复习客观题满分限时练2

适用于新高考新教材2025版高考数学二轮复习客观题满分限时练2

限时练2(时间:45分钟,满分:80分)一、选择题:本题共8小题,每小题5分,共40分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.(2024全国乙,理1)设z=,则=()A.1-2iB.1+2iC.2-iD.2+i2.(2024江苏南京、盐城一模)设M={x|x=,k∈Z},N={x|x=k+,k∈Z},则()A.M⫋NB.N⫋MC.M=ND.M∩N=∅3.(2024山东聊城模拟)已知等差数列{a n}的前n项和为S n,且a5=5,a1+S11=67,则a3a10是{a n}中的()A.第30项B.第36项C.第48项D.第60项4.(2024新高考Ⅰ,4)设函数f(x)=2x(x-a)在区间(0,1)内单调递减,则a的取值范围是()A.(-∞,-2]B.[-2,0)C.(0,2]D.[2,+∞)5.(2024湖南常德二模)某人同时掷两枚骰子,得到点数分别为a,b,则焦点在y轴上的椭圆=1的离心率e≥的概率是()A. B.C. D.6.(2024新高考Ⅱ,5)已知椭圆C:+y2=1的左、右焦点分别为F1,F2,直线y=x+m与C交于A,B两点,若△F1AB面积是△F2AB面积的2倍,则m=()A. B.C.-D.-7.(2024江苏苏锡常镇一模)已知正四面体P-ABC的棱长为1,点O为底面ABC的中心,球О与该正四面体的其余三个面都有且只有一个公共点,且公共点非该正四面体的顶点,则球O的半径为() A. B. C. D.8.(2024河南郑州二模)函数f(x)=若关于x的方程[f(x)]2-(m+1)f(x)+m=0恰有5个不相等的实数根,则实数m的取值范围是()A. B.C. D.二、选择题:本题共4小题,每小题5分,共20分.在每小题给出的选项中,有多项符合题目要求.全部选对的得5分,部分选对的得2分,有选错的得0分.9.(2024山东聊城三模)随着国民经济的快速发展和人民生活水平的不断提高,我国社会物流需求不断增加.社会物流总费用与GDP的比率是反映地区物流发展水平的指标,下面是2017—2024年我国社会物流总费用与GDP的比率统计,则()2017—2024年我国社会物流总费用与GDP的比率统计A.2024—2024这5年我国社会物流总费用逐年增长,且2024年增长的最多B.2017—2024这6年我国社会物流总费用的70%分位数为14.9C.2017—2024这6年我国社会物流总费用与GDP的比率的极差为0.2%D.2024年我国的GDP超过了121万亿元10.(2024河北唐山三模)函数f(x)及其导函数f'(x)的定义域均为R,若f(x)为奇函数,且f(x+2)=f(x),则()A.f'(x)为偶函数B.f'(0)=0C.f(x)的图象关于点(1,0)对称D.若F(x)=f(x)+xf'(x),则F'(x)为奇函数11.(2024广东汕头一模)已知直线l1:2x-y-3=0,l2:x-2y+3=0,圆C:(x-a)2+(y-b)2=r2,若圆C与直线l1,l2都相切,则下列选项肯定正确的是()A.l1与l2关于直线y=x对称B.若圆C的圆心在x轴上,则圆C的半径为3或9C.圆C的圆心在直线x+y-6=0或直线x-y=0上D.与两坐标轴都相切的圆C有且只有2个12.(2024山西临汾二模)已知二面角α-l-β的棱上有A,B两点,直线AC,BD分别在这个二面角的两个半平面内,且都垂直于AB.已知AB=4,AC=6,BD=8,记二面角α-l-β的大小为θ,则下列说法正确的是()A.当CD=2时,θ=60°B.当θ=120°时,CD=2C.θ≤∠CADD.点A到平面BCD的距离的最大值为三、填空题:本题共4小题,每小题5分,共20分.13.(2024广东茂名二模)已知曲线f(x)=x3+x-3在点(1,-1)处的切线与曲线g(x)=a cos x在点处的切线平行,则a的值为.14.(2024全国乙,理15)已知{a n}为等比数列,a2a4a5=a3a6,a9a10=-8,则a7= .15.(2024山东德州一模)某企业的一批产品由一等品零件、二等品零件混装而成,每包产品均含有10个零件.小张到该企业选购,利用如下方法进行抽检:从该企业产品中随机抽取1包产品,再从该包产品中随机抽取4个零件,若抽取的零件都是一等品,则确定选购该企业产品;否则,拒绝选购.假设该企业这批产品中,每包产品均含1个或2个二等品零件,其中含2个二等品零件的包数占10%,则小张确定选购该企业产品的概率为.16.(2024广东广州一模)已知抛物线C的顶点为坐标原点O,焦点F在x轴上,过点(2,0)的直线交C 于P,Q两点,且OP⊥OQ,线段PQ的中点为M,则直线MF的斜率的最大值为.限时练21.B解析因为z==1-2i,所以=1+2i.故选B.2.B解析因为x=k+(2k+1),k∈Z,所以集合N是由整数中奇数的组成,而集合M是由整数的组成,故N⫋M.3.A解析设等差数列{a n}的公差为d,由a5=5,得a1+4d=5; ①由a1+S11=67,得12a1+d=67,即12a1+55d=67.②由①②解得a1=1,d=1,所以a n=n,于是a3a10=3×10=30,而a30=30,故a3a10是{a n}中的第30项.4.D解析 (方法一导数法)由题意知,在f(x)=2x(x-a)中,f'(x)=(2x-a)2x(x-a)ln2,由函数在(0,1)内单调递减,知(2x-a)2x(x-a)·ln2≤0在(0,1)内恒成立,即2x-a≤0在(0,1)内恒成立,即a≥(2x)max,所以a≥2.故选D.(方法二复合函数法)因为函数y=2x在R上是增函数,要使复合函数f(x)=2x(x-a)在(0,1)内单调递减,只需函数h(x)=x(x-a)=在(0,1)内单调递减,所以≥1,即a≥2.故选D.5.C解析因为椭圆=1的焦点在y轴上,所以a>b.由e=,得0<.用投掷两枚骰子得到的点数组成的数组(a,b)表示这个试验的一个样本点,则该试验的样本空间共有36个样本点,其中满意0<的样本点有(2,1),(3,1),(4,1),(5,1),(6,1),(4,2),(5,2),(6,2),(6,3),共9个,所以所求概率为.6.C解析如图所示,椭圆+y2=1的左、右焦点分别为F1(-,0),F2(,0),设点F1,F2到直线y=x+m的距离分别为d1,d2,由点到直线的距离公式可知d1=,d2=.由消去y可得4x2+6mx+3m2-3=0.∵y=x+m与椭圆C交于A,B两点,∴Δ=36m2-16(3m2-3)>0,即-2<m<2.∵△F1AB的面积是△F2AB的两倍,∴有·|AB|·d1=2×·|AB|·d2,即d1=2d2,=2, 两边平方整理,得3m2+10m+6=0,解得m=-或m=-3.又-2<m<2,∴m=-.故选C.7.B解析因为正四面体P-ABC的棱长为1,所以正四面体P-ABC底面ABC上的高为PO=.由题可知球O与该正四面体的其余三个面都相切,设球O的半径为r,则V P-ABC=V O-PAB+V O-PBC+V O-PAC,所以r+r+r,所以r=.8.A解析由[f(x)]2-(m+1)f(x)+m=[f(x)-m][f(x)-1]=0,可得f(x)=m或f(x)=1.令y=x ln x且定义域为(0,+∞),则y'=ln x+1,当x∈时,y'<0;当x∈时,y'>0.所以y min=-.综上,依据f(x)的解析式可得f(x)的图象如图所示.明显f(x)=1有两个根,要使原方程有5个不相等的实数根,则f(x)=m有三个根,所以-<m<0.9.ACD解析由图表可知,2024—2024这5年我国社会物流总费用逐年增长,2024年增长的最多,且增长为16.7-14.9=1.8万亿元,故A正确;因为6×70%=4.2,所以70%分位数为第5项数据,即为16.7,所以这6年我国社会物流总费用的70%分位数为16.7,故B错误;由图表可知,2017—2024这6年我国社会物流总费用与GDP的比率的极差为14.8%-14.6%=0.2%,故C正确;由图表可知,2024年我国的GDP为17.8÷14.7%≈121.1万亿元,故D正确.故选ACD.10.AC解析对于A,因为f(x)为奇函数且在定义域R上可导,即f(-x)=-f(x),所以两边对x取导可得(-x)'f'(-x)=-f'(x),即f'(-x)=f'(x),所以f'(x)为偶函数,故A正确;对于B,令f(x)=sin(πx),明显f(x)为奇函数,且最小正周期T==2,即满意f(x+2)=f(x),则f'(x)=πcos(πx),则f'(0)=π,故B错误;对于C,因为f(x+2)=f(x)且f(x)为R上的奇函数,所以f(-x)=-f(x),即f(x+2)=-f(-x),所以f(x-1+2)=f(x+1)=-f(1-x),即f(x+1)+f(1-x)=0,所以f(x)的图象关于点(1,0)对称,故C正确;对于D,因为F(x)=f(x)+xf'(x),则F(-x)=f(-x)-xf'(-x)=-f(x)-xf'(x)=-F(x),所以F(x)为奇函数,由A可知F'(x)为偶函数,故D错误.故选AC.11.ACD解析对于A,设直线l1:2x-y-3=0上随意一点(x0,2x0-3)关于直线y=x对称的点为(m,n),则解得m-2n+3=0,所以点(m,n)在直线l2:x-2y+3=0上,所以l1与l2关于直线y=x 对称,故A正确.对于B,因为圆C的圆心在x轴上,所以圆心为(a,0).因为圆C与直线l1,l2都相切,所以r=,解得a=0或a=6.当a=0时,r=;当a=6时,r=,故B错误.对于C,由圆C:(x-a)2+(y-b)2=r2,得圆心为(a,b),半径为r,因为圆C与直线l1,l2都相切,所以r=,解得a+b-6=0或a=b,所以圆心(a,b)在直线x+y-6=0或直线x-y=0上,故C正确.对于D,由圆C:(x-a)2+(y-b)2=r2,得圆心为(a,b),半径为r,由圆C与两坐标轴都相切,得圆心到x 轴的距离为|b|,到y轴的距离为|a|,所以r=|a|且r=|b|,即|a|=|b|,解得a=b或a=-b.当a=b时,由题意可知=|a|,解得a=b=-或a=b=;当a=-b时,,无解,此时不满意.所以与两坐标轴都相切的圆C有且只有2个,故D正确.故选ACD.12.AB解析如图所示,过点A作AE∥BD且AE=BD,连接CE,ED,则四边形ABDE为平行四边形.又BD⊥AB,∴AE⊥AB.又AC⊥AB,∴∠CAE=θ.又AC∩AE=A,AC,AE⊂平面ACE,∴AB⊥平面ACE.又AB∥ED,∴ED⊥平面ACE,∴ED⊥CE,ED⊥AE.由题意知,BD⊥AB,AC⊥AB,∴=0,=0.∵,∴+2+2+2=62+42+82-2×6×8cosθ=116-96cosθ.对于A,当CD=2时,代入=116-96cosθ得cosθ=,又因为0°≤θ≤180°,所以θ=60°,故A正确;对于B,当θ=120°时,代入=116-96cosθ得||=2,故B正确;对于C,在△CAE中,cosθ=,在△CAD中,cos∠CAD=,∵AE<AD,0°≤θ≤180°,0°≤∠CAD≤180°,∴①当AC2+AE2-CE2>0时,cosθ>cos∠CAD,则θ<∠CAD,②当AC2+AE2-CE2=0时,cosθ=cos∠CAD,则θ=∠CAD=90°,③当AC2+AE2-CE2<0时,cosθ<cos∠CAD,则θ>∠CAD,故C错误;对于D,以A为原点,分别以AE,AB,AZ为x轴、y轴、z轴建立空间直角坐标系,如图所示,则A(0,0,0),E(8,0,0),D(8,4,0),B(0,4,0),C(6cosθ,0,6sinθ),所以=(8,0,0),=(6cosθ,-4,6sinθ),=(0,-4,0),设平面BCD的一个法向量为n=(x,y,z),则取n=(0,3sinθ,2),∴点A到平面BCD的距离为d=,又0°≤θ≤180°,所以0≤sin2θ≤1,∴当sinθ=1时,d取得最大值,故D错误.13.-3解析f'(x)=3x2+1-,g'(x)=-a sin x,由题意可知,g'=f'(1),即-a sin=3,解得a=-3.14.-2解析 (方法一)设等比数列{a n}的公比为q,则由a2a4a5=a3a6,a9a10=-8,得可得所以a7=a1q6=a1q·q5=-2.(方法二)设{a n}的公比为q.由a2a4a5=a3a6,可得a2=1.又因为a9a10=a2q7·a2q8=-8,即q15=-8,得q5=-2,则a7=a2·q5=-2.15.解析依据题意,该企业这批产品中,含2个二等品零件的包数占10%,则含1个二等品零件的包数占90%,在含1个二等品零件一包产品中,随机抽取4个零件,若抽取的4个零件都是一等品,其概率P1=,在含2个二等品零件一包产品中,随机抽取4个零件,若抽取的4个零件都是一等品,其概率P2=,则小张确定选购该企业产品的概率P=.16.解析依题意,抛物线C的焦点在x轴的正半轴上,设C的方程为y2=2px,p>0,明显直线PQ不垂直于y轴,设直线PQ的方程为x=ty+2,点P,Q,联立消去x得y2-2pty-4p=0,则有y1+y2=2pt,y1y2=-4p.由OP⊥OQ得+y1y2=4-4p=0,解得p=1,于是抛物线C:y2=2x的焦点F,弦PQ的中点M的纵坐标为=t,则点M(t2+2,t).若直线MF的斜率最大,则必有t>0,则直线MF的斜率k=,当且仅当2t=且t>0,即t=时,等号成立,所以直线MF的斜率的最大值为.。

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限时(1)I.改错.Dreams play important role in our daily life and a good dream is the motivation to success. To realize a dream, one should learn to defeat difficulties through constant struggles so well as persistence.Like most people there was a time that I dreamed of being an excellent student in my English after entering into middle school. To catch up my classmates, I made pen-friends with some foreign students to improve my writing English. Finally, I won the English Speech Contest, realize my dream.Now, I hope that I can admitted to a key university after graduation from middle school. I wish to be a doctor in the future. Of course, whether my dream will come true depend on my personal efforts. I strong believe that where there is a dream, there is hope and there is a way.II.阅读下面材料,在空白处填入适当的内容(每空1词)或括号内单词的正确形式。

Freeflyers: Modem SkydiversHave you experienced the thrilling sport—freeflying? Imagine falling towards the planet Earth at 1 awesome speed of 300 kilometers per hour. You start your fall from over four kilometers above the Earth. And you have less than one minute before you pull your parachute (降落伞)cord. You are falling 2 fast that just turning your head can send you off 3 a different direction. This is the wild side of a sport that has not found its limit—freeflying.Freeflying 4 (base) on the more traditional skydiving, 5 of which are eye-catching. However, it is more terrifying to watch freeflyers create formations and movements. Freeflyers, 6 the name suggests, enjoy the more spontaneous(即兴的)thrill of doing their own things.The wildest trip for a freeflyers is falling …head down‟. Falling …head first‟ requires a great deal of control, which means 7 (travel) not only fast but also steadily. Even the 8 (slight) movement has a great effect on your direction.They wear the amusing jumpsuits, strange helmets and smaller parachutes. 9 (actual), their parachutes are about one quarter the size of the traditional skydiver‟s parachutes. It is only in the last few years 10 freeflying has gained any real public acceptance. 1.________ 2._________ 3._________ 4.___________5.____________6.________7._________8.___________9.__________10.___________III.完型填空.A Disaster Makes a Strong PersonI lost my sight when I was four years old by falling off a box car in a freight(货物)yard in Atlantic City and landing on my head. Now I am thirty-two. I can still 41 the brightness of sunshine. It would be 42 to see again, but a 43 can do strange things to people. I don‟t mean that I would prefer to go without my eyes. I simply mean that the 44 of them made me 45 more what I had.Life, I believe, asks a continuous series of adjustments to reality. The more quickly a person is able to make these adjustments, the more 46 his own private world becomes. The adjustment is never 47 . I was totally confused and afraid. But I was lucky. My parents and my teachers saw something in me—the 48 to live—which I didn‟t see, and they made me want to 49 against blindness.The hardest 50 I had to learn was to believe in myself. I am not talking about simply the kind of 51 that helps me down an unfamiliar staircase alone. That is part of it. But I mean something bigger than that: the confidence that I am, despite being imperfect, a real, 52 person; that there is a special place where I can make myself fit.It took me years to discover and 53 this confidence. It had to start with the simplest things. Once a man gave me an indoor baseball. I thought he was making fun of me and I was hurt. “I can‟t use this.” I said. “Take it with you,” he 54 me, “and roll it around.” The words55 in my head. “Roll it around!” By rolling the ball I could hear where it went. This gave me an idea how to achieve a goal I had thought 56 : playing baseball. At Philadelphia‟s Overbrook School for the Blind I 57 a successful variation of baseball and I called it ground ball.All my life I have set ahead of me a series of goals and then tried to reach them, one at a time. I had to be clear about my 58 . It was no good trying for something that I knew at the start was wildly out of reach 59 that only invited the bitterness of failure. I would 60 sometimes anyway but on the average I made progress.41. A. remember B. affect C. measure D. bring42. A. possible B. wonderful C. hopeful D. reasonable43. A. question B. mistake C. disaster D. situation44. A. importance B. value C. loss D. attention45. A. record B. expect C. offer D. appreciate46. A. natural B. modern C. meaningful D. challenging47. A. necessary B. easy C. difficult D. practical48. A. right B. plan C. place D. potential49. A. guard B. hit C. argue D. fight50. A. game B. skill C. lesson D. knowledge51.A.self-control B.self-confidence C.self-defense D. self-improvement52. A. modest B. energetic C. generous D. positive53. A. strengthen B. express C. share D. destroy54. A. urged B. blamed C. respected D. admired55. A. held B. stuck C. bothered D. knocked56. A. important B. specific C. common D. impossible57. A. invented B. confirmed C. checked D. noticed58. A. interest B. limitation C. experience D. responsibility59. A. once B. unless C. because D. though60. A. fail B. try C. act D. continueIV.七选五.Travel MannersEvery culture has its own unwritten list of behavior that is acceptable. Every society also has its taboos, or types of behavior that are considered a violation of good manners.The word taboo comes from the Tongan language and is used in modern English to describe verbal and nonverbal behavior that is forbidden or to be avoided. 36 They tend to be specific to a culture or country, and usually form around a group‟s values and beliefs. What is considered accep table behavior in one country may be a serious taboo in another.Verbal taboos usually involve topics that people believe are too private to talk about publicly, or relate to one‟s manner of speaking. In many cultures, for example, it is considered bad manners to discuss subjects such as sex or religion in public. In some countries, the volume of one‟s voice may annoy people. 3738 For example, one of the biggest differences among many Western, Asian, and African cultures is the use of eye contact. In the US, people make eye contact when they talk to others. 39 In many Asian and African cultures, however, children are taught to lower their eyes when talking to their elders, or those of higher rank, as a way to show respect.Certain gestures made with the hands can have very different meanings depending on the country you are in. Crossing your middle finger over your forefinger is the sign for good luck in many western countries. 40 Also, in some Asian countries, moving your hands a lot while talki ng, or …talking with your hands‟, is considered unsuitable.Behavior that is acceptable and non-offensive in one culture can be highly offensive in another. When visiting a foreign country, be aware of some of the basic differences, as this will help to ensure a more enjoyable trip.A.Nonverbal taboos usually relate to body language.B.In Vietnam and Argentina, however, it is a rude gesture.C.In spite of what some people may think, taboos are not universal.D.Cancer is a taboo subject and people are frightened to talk openly about it. E.Learn a country‟s customs so that you don‟t hurt the local people unconsciously. F.They might think that someone who is speaking or laughing loudly is rude or aggressive.G.If a person avoids eye contact, others might think they are being dishonest or unconfident.V.阅读理解. AParents whose children show a special interest in a particular sport feel very difficult to make a decision about their children's careers. Should they allow their children to be trained to become top sportsmen or sportswomen? For many children it means starting school work very young, and going out with friends and other interests have to take a second place. It's very difficult to explain to a young child why he or she has to train five hours a day, even at the weekend, when most of his or her friends are playing.Another problem is of course money. In many countries, money for training isavailable from government for the very best young sportsmen and sportswomen. If this help cannot be given, it means that it is the parents who have to find the time and the money to support their child's development and sports clothes, transport to competitions, special equipment, etc. They can all be very expensive.Many parents are worried that it is dangerous to start serious training in a sport at an early age. Some doctors agree that young muscles may be damaged by training before they are properly developed. Professional trainers, however, believe that it is only by training young that you can reach the top as a successful sports person. It is clear that very few people do reach the top, and both parents and children should be prepared for failure even after many years of training.57. What does Paragraph l mainly tell us?A. Parents are uncertain about their children's interest in sport.B. The advantages and disadvantages about sports training.C. How to explain to children about their sports training.D. Becoming top sportsmen or sportswomen is hard.58. Sports training can be expensive when DarentsA. can't find a good coach through government.B. can't receive the help from government.C. have to make children be the best.D. have to buy sports clothes.59. It can be inferred from Paragraph 3 that _________A. training should be taken to succeedB. parents are worried about the dangers of trainingC. doctors are positive about training youngD. professional trainers agree with training young60. What does the text mainly talk about?A. Problems school children face.B. The relation between sports and training.C. Worries from parents about kids' training in sports.D. Different ideas about sports training for school children.BThe picture-like island is rich in scenic beauty. Barbados sightseeing is a photographer's dream that comes true with numbers of natural wonders, breathtaking scenic views, attractive gardens and miles of white, sandy beaches. There's so many things to see and to do, as you check out some of the places of interest on the island.Historical Appeal ExperienceFull of historical appeal you'll love the impressive collection of beautiful great houses, landmarks, old churches, and traditional ancient houses some of which may date back to the 16th century. Historic Bridgetown, over 375 years old, capital of Barbados, is located with its color1 ful fishing boats and splendid yachts (极佳的游艇) . Check out the Barbados National and see some of the island's most beautiful homes.Nature Charm EnjoymentNature lovers will find the Botanical Garden, as well as the wonderful landscapes of the tropical plants and flowers, a welcome addition to their trip. Nature paths, rocky caves and local wildlife will make these tours relaxing.A guided island tour is of excellent value for money as well as informative changes from scenic, fun-filled, historic tours to exciting safari tours. If seeing the island from a different point is what you want to do, then try one of our sea tours, air tours or underwater tours to enjoy what sea plants and animals it can offer.Rental Drive AdventureIf you rent a car, here are a few things to remember. The roads, thin and rocky, are sometimes leading nowhere and often unmarked. You might think of some possible dangers. But don't get upset if you get lost-everybody does, even locals, Bajans ! If you make a wrong turn, consider it is a part of the adventure of touring Barbados. You might want to pick up any of the several visitors' guides which include maps. For more detailed information, please contact us by either of the following:Tel: (246) 427-1952 0r 436-7189Fax: (246) 436-223453. Which of the followings is the sightseeing of Historic Bridgetown?A. Traditional houses and rocky caves.B. Beautiful houses and nature paths.C. Old churches and splendid yachts.D. Landmarks and tropical plants.54. According to the passage Botanical Garden _A. can make tours dangerous with rocky cavesB. is full of tropical plants and landmarksC. will cost travelers lots of moneyD. may attract lovers of nature55. If travelers prefer something risky in Barbados, they may _______.A. have a guided island tourB. see the Botanical GardenC. go to Historic BridgetownD. try a rental drive adventure56. What should be the best title for the passage?A. A Car Adventure of Touring Barbados with FunB. An Island of Historical Appeal as One ExpectsC. Barbados-A Wonderful Place for SightseeingD. Return to Nature, Know More of the BajansCIt was a long time since I visited my mother last time. The demands of my work and my three children had made it possible to visit her only occasionally. That night I called to invite her to go out for dinner and a movie. She thought about it for a moment, and then agreed.That Friday after work, I drove over to pick her up. When I arrived at her house, I noticed that she had curled her hair and was wearing the dress that she had worn to celebrate her last wedding anniversary. She smiled from a face that was as beautiful as an angel's.We went to a very nice and comfortable restaurant. After we sat down, I had to read the menu. A smile was on her lips.“It was I who used to ha ve to read the menu when you -were a child,” she said. “Then it's time that you relax and let me return the favor,” I responded.During the dinner we had an agreeable conversation-nothing special but catching up on recent events of each other's life. We talked so much that we missed the movie. As we arrived at her house later, she said,“I'll go out with you again, but only if you let me invite you.” I agreed.A few days later my mother died of an unexpected heart attack. It happened so suddenly that I didn't have a chance to do anything for her. At that moment I understood the importance of saying “I love you” in time and giving our loved ones the time that they deserve. Nothing in life is more important than your family. Give them the time they deserve, bec ause these things cannot be put off till “some other time”.50. Why did the mother curl her hair and wear the dress that night?A. She was trying to be polite.B. She felt happy to meet the author.C. She had no much time to go to the cinema.D. She had the habit to do so when going out.51. How can we learn about the talk between the author and the mother?A. It was pleasant.B. It wasted them much time.C. It settled the problem between them.D. It made them regret having missed the film.52. Why does the author tell the story about the meeting with his mother?A. To share his rich experience.B. To show his love to his mother.C. To express sorry about his mother.D. To advise people to care for the family.DWinter weather has returned to northern areas of the world. In much of the United States, winter means the return of snow.Snow is a form of frozen water. It contains many groups of tiny ice particles (颗粒) called snow crystals (晶体) . These crystals grow from water particles in cold clouds. They usually grow around a piece of dust. All snow crystals have six sides, but they grow in different shapes. The shape depends mainly on the temperature and water levels in the air. The shape of a snow crystal may change from one form to another as the crystal passes through levels of air with different temperatures. Snow contains much less water than rain. About seventy-five centimeters of snow has as much water as two and one-half centimeters of rain.Generally, the color1 of snow and ice appears white. This is because the light we see from the sun is white. Most natural materials take in some sunlight. However, when light travels from air to snow, some light is sent back, or reflected (反射). Snow crystals have many surfaces to reflect sunlight. It is this light that gives snow its white color1 .Much of the water we use comes from snow. Melting snow gives water to rivers and crops. Snowfall helps to protect plants and some wild animals from cold. Fresh snow is made largely of air which is kept among the snow crystals. Because the air has trouble moving, the movement of heat is greatly reduced. However, snow is responsible for the deaths of hundreds of people in the United States every year. Many people die in traffic accidents on roads that are covered with snow or ice.46. The shape of snow depends on _______.A. different temperaturesB. different water levelsC. temperatures and water levels in the airD. temperatures and levels of air47. According to the text, snow looks white because _______.A. snow is actually whiteB. snow crystals are whiteC. the reflected light is whiteD. the ice particles are white48. How can snow protect plants from the cold?A. It gives them much heat.B. It has a higher temperature.C. It keeps them from wind.D. It contains air which helps hold heat.49. What does the last paragraph of the text mainly talk about?A. Snow can give water to rivers and crops.B. Snow can help crops grow better.C. Snow has both advantages and disadvantages.D. Snow is the cause of the deaths of many people.Key:限时一I.1. play important role- play an important role2. so well as- as well as3. a time that- a time when4. entering into-去掉into5. catch up my- catch up with my6. writing English-written English7. realize-realizing8. can admitted- can be admitted9. depend- depends10. strong- stronglyII.1.an 2. So 3. In 4. is based 5.both6.as7.travel(l)ing8.slightest9.Actually10 thatIII:41—45 ABCCD 46—50 CBDDC 51—55 BDAAB 56—60 DABCA IV.CFAGBV.A: ABDC B: CDDC C: BAD D: CCDC。

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