课时规范训练(35)

合集下载

高中政治必修一课时规范训练:综合练(3)

高中政治必修一课时规范训练:综合练(3)

第三课综合练一、选择题1.下面四幅图中,在其他条件不变时,相对比较正确地反映了家庭消费与居民收入之间的关系的是()解析:选C。

收入是消费的前提和基础,所以是正函数,但收入并不是影响消费的唯一因素,影响消费的因素除了收入之外还有物价、消费心理等,因此变化应该是平滑式的抛物线,答案为C项。

2.一般说来,当人均收入达到一定水平时,这个地方就会出现拆旧房盖新房的高潮。

改革开放以来,我国许多农民把草房改建成瓦房,又从瓦房搬进了楼房。

这一现象证明()A.家庭消费是个人消费行为,与社会无关B.改变消费结构就能提高消费水平C.收入水平的提高将导致消费水平的提高D.消费为生产创造动力,生产是消费的目的答案:C3.近年来,我国高档商品的消费以年均两位数的速度增长。

这表明()①我国居民发展资料和享受资料的消费逐渐增加②消费结构会随着经济的发展、收入的增加而不断变化③居民当前的可支配收入增多④居民消费已从发展资料消费向享受资料消费转变A.①②③B.②③④C.①②④D.①③④解析:选A。

本题可用排除法解答。

根据近年来高档商品的消费以年均两位数的速度增长就说居民消费已从发展资料消费向享受资料消费转变太断章取义了。

高档商品的增长是事实,但我国多数居民的消费还达不到转向享受资料消费的水平,故应排除④,选A项。

4.张女士由于工作流动性较大,每到一地都是租房、租车,非常省心。

可每到一处都需要家具,而购置一套简单的家具至少也需要花去她3个月的工资,令其烦恼,于是她决定也租家具。

对此,下列说法正确的是()A.张女士通过租赁消费提高了商品的使用价值B.张女士通过租赁消费提高了商品的价值量C.张女士对租到的物品暂时拥有其使用权D.张女士对租到的物品暂时拥有其所有权解析:选C。

租赁消费不会提高商品的使用价值和价值量,故A、B两项不选。

租赁消费只是暂时获得该商品的使用权,而不是所有权,故选C项,排除D项。

5.消费有不同的类型,我们最常见的有钱货两清的消费。

2025优化设计一轮课时规范练35 三角函数的图象与性质

2025优化设计一轮课时规范练35 三角函数的图象与性质

故 D 正确.故选 BD.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
9.(2022·新高考Ⅰ,6)记函数 f(x)=sin +

<T<π,且
3
A.1
y=f(x)的图象关于点
3
B.2

,2
2
π
4
+b(ω>0)的最小正周期为 T.若
中心对称,则 f
π
π
当 k0=0 时,-2 ≤ ≤0,取 φ=-4 ,
π
所以满足条件的一个正弦型函数为 f(x)=2sin(2x- ).
4
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
12.(2024·河北承德模拟)已知 ω>1,函数
π
f(x)=cos(ωx- ).
π

故函数 f(x)的单调递增区间为(kπ+ ,kπ+ ),k∈Z.
12
12
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
A )
3.(2024·广西玉林模拟)若函数f(x)=asin x+1的最大值为4,则函数
g(x)=cos(ax+1)的最小正周期为( D )
3
3
π
π
π
π
则-3 +kπ≤x≤kπ+6 ,k∈Z,故 f(x)的单调递增区间为[-3 +kπ,kπ+ 6 ],k∈Z.
π π
π
π
π π
π
(2)由 x∈[6 , 3 ],则设 t=ωx-3 ∈[ 6 -3 , 3 - 3 ],

福建专用高考英语一轮复习课时规范练35Unit20(含解析)北师大版

福建专用高考英语一轮复习课时规范练35Unit20(含解析)北师大版

课时规范练35 Unit20(35分钟)Ⅰ.阅读理解A(2018·全国Ⅱ卷)Many of us love July because it’s the month when nature’s berries and stone fruits are in abundance.Thesecolourful and sweet jewels from British Columbia’s fields are little powerhouses of nutritional protection.Of the common berries,strawberries are highest in vitamin C,although,because of their seeds,raspberries contain a little more protein(蛋白质),iron and zinc(not that fruits have much protein).Blueberries are particularly high in antioxidants(抗氧化物质).The yellow and orange stone fruits such as peaches are high in the carotenoids we turn into vitamin A and which are antioxidants.As for cherries(樱桃),they are so delicious who cares?However,they are rich in vitamin C.When combined with berries or slices of other fruits,frozen bananas make an excellent base for thick,cooling fruit shakes and low fat “ice cream”.For this purpose,select ripe bananas for freezing as they are much sweeter.Remove the skin and place them in plastic bags or containers and freeze.If you like,a squeeze of fresh lemon juice on the bananas will prevent them turning brown.Frozen bananas will last several weeks,depending on their ripeness and the temperature of the freezer.If you have a juicer,you can simply feed in frozen bananas and some berries or sliced fruit.Out comes a “soft-serve” creamy dessert,to be eaten right away.This makes a fun activity for a children’s party;they love feeding the fruit and frozen bananas into the top of the machine and watching the ice cream come out below.1.What does the author seem to like about cherries?A.They contain protein.B.They are high in vitamin A.C.They have a pleasant taste.D.They are rich in antioxidants.2.Why is fresh lemon juice used in freezing bananas?A.To make them smell better.B.To keep their colour.C.To speed up their ripening.D.To improve their nutrition.3.What is “a juicer” in the last paragraph?A.A dessert.B.A drink.C.A container.D.A machine.4.From which is the text probably taken?A.A biology textbook.B.A health magazine.C.A research paper.D.A travel brochure.B(2018·江苏无锡期中)A new app is trying to make it simpler to help you react to photos and videos that your friends post online—it’s using AI to capture(捕捉) your facial expressions and automatically translate them into a range of emoji faces.Polygram,which is free and available only for the iPhone for now,is a social app that lets you share things like photos,videos,and messages.Unlike on Facebook,though,where you have a small range of pre-set reactions to choose from beyond clicking a little thumbs-up icon,Polygram uses a neural(神经的)network that runs locally on the phone to figure out if you’resmiling,bored,embarrassed,surprised,and more.MarcinKmiec,one of Polygram’s founders,says the app’s AI works by capturing your face with the front-facing camera on the phone and analyzing the images as quickly as possible,rather than just looking at specific points on the face like your eyes and nose.“This is done directly on the phone,using the iPhone’s picture processing unit,”he says.When you look at a post in the app,you see a small yellow emoji on the bottom of the display,its expression changing along with your real one.There’s a slight delay—20 milliseconds,which is just hard to notice—between what you’re expressing on you r face and what shows up in the app.The app records your response(s) in a little log of emoji on the side of the screen,along with those of others who’ve already looked at the same post.The app is meant to appeal to those who really care about how they’re understood on social ers can see a record of the emoji reactions to each photo or video they post to the app,as well as details about who looked at the post,how long they looked at it,and where they’re located.Eventually,the founders say,they may release software tools that let other developers come up with their own applications for the technology.5.As a new social app,which characteristic of Polygram is TRUE?A.It is cheap and available only for the iPhone for now.B.It eventually transfers emoji faces to facial expressions automatically.C.Itspecialises in a neural network that runs originally on your phone.D.It needs to choose from many reactions that have been set previously.6.Those who will be obviously attracted by this new app.A.are new technology fansB.are addicted to new iPhonesC.have great passion for emojisD.are concerned about self-evaluation7.What’s the purpose of the passage?A.To promote and sell a new software.B.To introduce to us a new and popular app.C.To reveal the significance of new technology.D.To inform us of the popularity of a new app.Ⅱ.七选五阅读(2017·全国Ⅲ卷)根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。

人教版高中化学必修第二册课时规范练 第5章 化工生产中的重要非金属元素 第2节 第2课时 氨和铵盐

人教版高中化学必修第二册课时规范练 第5章 化工生产中的重要非金属元素 第2节 第2课时 氨和铵盐

第2课时氨和铵盐课后·训练提升学考过关检验1.下列说法中正确的是( )。

A.氨水的密度比水的密度小,且浓度越大,密度越大B.氨是无色无臭的气体C.可用向上排空气法收集氨D.氨溶于水所得的溶液可使酚酞溶液变为红色2.下列关于氨的喷泉实验形成的原理解释正确的是( )。

A.氨呈碱性B.氨极易溶于水,烧瓶内外形成压强差C.氨易液化D.NH3溶于水后形成的溶液易挥发,是由于胶头滴管挤入的少量水可使烧瓶内的氨迅速溶于水,烧瓶内外产生了压强差。

3.将湿润的红色石蕊试纸放在进行下列实验的试管口,试纸不变蓝的有( )。

A.加热浓氨水B.加热NH4Cl和浓NaOH的混合溶液C.加热NH4Cl和Ca(OH)2的混合物D.加热饱和NH4Cl溶液4.现欲分离氯化钠和氯化铵的混合物,可采用的方法是( )。

A.加入NaOH溶液B.加入AgNO3溶液C.加热并冷却D.加入水受热没有明显变化,NH4Cl加热分解,同时生成的NH3和HCl气体导出后又能迅速化合生成NH4Cl。

5.下列关于氨的叙述中,正确的是( )。

A.氨因为有刺激性气味,因此不用来作制冷剂B.氨具有还原性,可以被氧化为NOC.氨极易溶于水,因此氨水比较稳定(不容易分解)D.氨溶于水显弱碱性,因此可使石蕊溶液变为红色,所以氨具有制冷作用,液氨常用作制冷剂,A项错误;氨中氮元素为最低负化合价-3价,氨能够被氧化生成一氧化氮,B项正确;一水合氨不稳定,受热易分解,C项错误;氨溶于水显弱碱性,因此可使石蕊溶液变为蓝色,D项错误。

6.下列装置用于进行指定实验时,能达到实验目的的是( )。

A.用装置甲制备氨B.用装置乙除去氨中的少量水C.用装置丙收集氨D.用装置丁吸收多余的氨,A错误;氨能与浓硫酸反应,B错误;装置丙中只有进气口,没有出气口,C错误;氨在水中的溶解度极大,被水吸收时容易发生倒吸,装置丁可以防止倒吸,D正确。

7.某同学探究氨和铵盐的性质,相关实验操作及现象描述正确的是( )。

2024年高考总复习优化设计一轮用书数学配北师版(适用于新教材)课时规范练35

2024年高考总复习优化设计一轮用书数学配北师版(适用于新教材)课时规范练35

课时规范练35《素养分级练》P316基础巩固组1.如图所示,α∩β=l,A∈α,B∈α,AB∩l=D,C∈β,C∉l,则平面ABC与平面β的交线是()A.直线ACB.直线ABC.直线CDD.直线BC答案:C解析:由题意知,D∈l,l⊂β,∴D∈β.又D∈AB,∴D∈平面ABC,即点D在平面ABC与平面β的交线上.又C∈平面ABC,C∈β,∴点C在平面ABC与平面β的交线上,∴平面ABC∩平面β=CD.故选C.2.如图所示,在空间四边形ABCD中,E,H分别是边AB,AD的中点,F,G分别是边BC,CD上的点,且CF CB =CGCD=23,则下列说法正确的是()①E,F,G,H四点共面②EF与GH异面③EF与GH的交点M可能在直线AC上,也可能不在直线AC上④EF与GH的交点M一定在直线AC上A.①③B.①④C.②③D.②④答案:B解析:在空间四边形ABCD中,E,H分别是边AB,AD的中点,则EH∥BD,且EH=12BD,F,G分别是边BC,CD上的点,且CFCB =CGCD=23,则FG∥BD,且FG=23BD,因此FG∥EH,点E,F,G,H四点共面,故①正确,②错误;FG∥EH,FG>EH,即四边形EFGH是梯形,则EF与GH必相交,令交点为M,点M 在EF上,而EF在平面ACB上,则点M在平面ACB上,同理点M在平面ACD上,则点M是平面ACB与平面ACD的公共点,而AC是平面ACB与平面ACD的交线,所以点M一定在直线AC上,故④正确,③错误.3.如图所示,在直三棱柱ABC-A1B1C1中,∠BCA=60°,M,N分别是A1C1,CC1的中点,BC=CA=CC1,则BN与AM所成角的余弦值为()A.35B.45C.23D.34答案:A解析:取BB1的中点Q,AC的中点P,连接C1Q,PQ,C1P,则BN∥C1Q,AM∥C1P,∴∠QC1P为BN与AM所成角.由题可知直三棱柱ABC-A1B1C1为正棱柱,设BC=2,则AM=BN=√5,PQ=2,在△PQC1中,可得cos∠PC1Q=2×√5×√5=35,∴BN与AM所成角的余弦值为35.4.(多选)(2023·江苏南京一中高三检测)在四面体ABCD中,M,N,P,Q,E分别为AB,BC,CD,AD,AC 的中点,则下列说法正确的是()A.M,N,P,Q四点共面B.∠QME=∠CBDC.△BCD∽△MEQD.四边形MNPQ为梯形答案:ABC解析:对于A,易知MQ∥BD,NP∥BD,则MQ∥NP,所以M,N,P,Q四点共面,故A正确;对于B,根据等角定理,得∠QME=∠CBD,故B正确;对于C,由等角定理,知∠QME=∠CBD,∠QEM=∠BCD,所以△BCD ∽△MEQ ,故C 正确;对于D,易知MQ ∥BD ,MQ=12BD ,NP ∥BD ,NP=12BD ,所以MQ ∥NP ,MQ=NP ,所以四边形MNPQ 为平行四边形,故D 不正确.故选ABC.5.三条不同的直线a ,b ,c ,若a ∥b ,c 与a ,b 都相交,则a ,b ,c 三条直线能确定的平面的个数是 . 答案:1解析:由直线a ∥b ,可得直线a ,b 可以唯一确定一个平面,设该平面为α.设a ∩c=A ,b ∩c=B ,可得A ∈α,B ∈α.因为A ∈c ,B ∈c ,所以c ⊂α.所以a ,b ,c 三条直线能确定的平面的个数是1.综合提升组6.若∠AOB=∠A'O'B',OA ∥O'A',且OA 与O'A'的方向相同,则OB 与O'B'( ) A.一定平行且方向相同B.一定平行且方向相反C.一定不平行D .不一定平行 答案:D解析:如图, 若∠AOB=∠A'O'B',OA ∥O'A',且OA 与O'A'的方向相同,则OB 与O'B'不一定平行.7.如图,在正方体ABCD-A 1B 1C 1D 1中,AB=1,DD 1中点为Q ,则过A ,Q ,B 1三点的截面面积为 .答案:98解析:如图所示,取C 1D 1的中点P ,连接PQ ,PB 1,AB 1,AQ 和DC 1.∵P ,Q 分别是C 1D 1,DD 1的中点,∴PQ ∥C 1D ,且PQ=12C 1D.∵AB 1∥C 1D ,∴PQ ∥AB 1,PQ=12AB 1.∴四边形AB 1PQ 是过A ,Q ,B 1三点的截面,且四边形AB 1PQ 是梯形.∵AB=1,∴AB 1=√12+12=√2,PQ=√22,AQ=PB 1=√12+(12) 2=√52,且等腰梯形AB 1PQ 的高为√(√52) 2-[12×(√2-√22)]2=32√2.∴截面面积为12×√22+√2×32√2=98.创新应用组8.(2023·河南安阳高三开学考试)一封闭的正方体容器ABCD-A1B1C1D1,P,Q,R分别是AB,BC和C1D1的中点,由于某种原因,P,Q,R处各有一个小洞,当此容器内存水的表面恰好经过这三个小洞时,容器中水的上表面形状是()A.三角形B.四边形C.五边形D.六边形答案:D解析:如图,设过P,Q,R三点的平面为平面α.分别取A1D1,A1A,CC1的中点F,E,M,连接RF,FE,EP,PQ,QM,MR,EM,QF,RP.易知RF∥PQ,所以F∈平面α.又RP∥MQ,所以M∈平面α.又EF∥RP,所以E∈平面α.所以过P,Q,R三点的平面为六边形RFEPQM.故容器中水的上表面的形状是六边形.。

人教版高考生物学一轮总复习课后习题 课时规范练29

人教版高考生物学一轮总复习课后习题 课时规范练29

课时规范练29《课时规范练》P455一、选择题1.某人因啃咬过硬的食物,口腔黏膜中的毛细血管受损,导致形成暗红色的血疱。

如果血疱不大,几天后会自行消失。

下列分析正确的是( )A.血疱中所含的细胞外液主要是组织液和血液B.血疱呈暗红色是因为血浆蛋白渗入其中C.血疱自行消失是因为其中的液体全部渗回毛细血管D.血疱的形成和消失说明内环境中的物质是不断更新的2.(天津模拟)下图中的A、B、C、D分别表示组成人体体液的4种主要成分。

下列相关叙述错误的是( )A.图中B、C、D共同构成人体的内环境B.A、B、C、D中都能完成ATP的合成与水解,为生命活动的正常进行提供能量C.从物质含量的角度比较,C与B、D最大的区别是C中含有较多的蛋白质D.B中有包括细胞代谢产物在内的各种物质,其中少部分被吸收转化为D3.(广东模拟)高原反应亦称高山病,是人体急速进入海拔3 000米以上高原暴露于低压低氧环境后产生的各种不适,是高原地区独有的常见病。

常见的症状有头痛、失眠、食欲减退、疲倦、呼吸困难等,还可能引起颜面水肿、血液中红细胞和血红蛋白的数量增多。

下列叙述错误的是( )A.血红蛋白数量增多会引起血浆渗透压增大B.高原反应说明环境条件会影响人体内环境的稳态C.高原反应说明人体维持稳态的调节能力是有一定限度的D.高原反应引起颜面水肿可能与细胞外液渗透压的改变有关4.下图为人体体液物质交换示意图,下列叙述正确的是( )A.淋巴细胞只生活在④中B.②中可能存在神经递质、激素和胰蛋白酶等物质C.①中的物质可直接来自细胞内液、组织液和淋巴液D.①②③④等构成的内环境稳态是机体进行正常生命活动的必要条件,①是血浆,②是组织液,③是细胞内液,④是淋巴液。

淋巴细胞所处的内环境是淋巴液和血浆,A项错误;胰蛋白酶属于胰液的成分,通过导管进入消化道,不属于内环境成分,不会存在于②(组织液)中,B项错误;①是血浆,血浆和组织液、血细胞的细胞内液之间都有双向的物质交换,淋巴液对血浆有单向的物质交换,因此血浆中的物质可直接来自组织液、细胞内液和淋巴液,C项正确;内环境由①②④构成,③是细胞内液,不属于内环境,D项错误。

课时规范训练(一)

课时规范训练(一)

课时规范训练A基础巩固练1.(多选题)下列各组对象能构成集合的有()A.接近于1的所有正整数B.小于0的实数C.(2023,1)与(1,2023)D.某校高一(1)班的聪明学生解析:BC A中,接近于1的所有正整数标准不明确,故不能构成集合;B 中小于0是一个明确的标准,能构成集合;C中(2023,1)与(1,2023)是两个不同的点,是确定的,能构成集合;D中“某校高一(1)班的聪明学生”中“聪明”的标准不确定,因而不能构成一个集合.2.给出下列关系:①13∈R;②5∈Q;③-3∉Z;④-3∉N,其中正确的个数为()A.1B.2C.3D.4解析:B 13是实数,①正确;5是无理数,②错误;-3是整数,③错误;-3是无理数,④正确.故选B.3.下列说法中正确的是()A.某学校高一(8)班比较漂亮的女生能确定一个集合B.由1,32,64,⎪⎪⎪⎪⎪⎪-12,0.5组成的集合有5个元素C.将小于100的自然数按从小到大的顺序排列和按从大到小的顺序排列分别得到两个不同的集合D.方程x2+1=2x的解集中只有一个元素解析:D A是错误的,因为“漂亮”是个模糊的概念,因此不满足集合中元素的确定性;B是错误的,32=64,⎪⎪⎪⎪⎪⎪-12=0.5,根据互异性,得由1,32,64,⎪⎪⎪⎪⎪⎪-12,0.5组成的集合只有3个元素:1,32,0.5;C是错误的,根据集合中元素的无序性可知,小于100的自然数无论按什么顺序排列,构成的集合都是同一集合;D是正确的,方程x2+1=2x有两个相等的解,即x1=x2=1,其解集中只有一个元素,故D正确.4.下列各组中,集合P与Q表示同一个集合的是()A.P是由元素1,3,π构成的集合,Q是由元素π,1,|-3|构成的集合B.P是由π构成的集合,Q是由3.141 59构成的集合C.P是由2,3构成的集合,Q是由有序数对(2,3)构成的集合D.P是满足不等式-1≤x≤1的自然数构成的集合,Q是方程x2=1的解集解析:A由于A中P,Q的元素完全相同,所以P与Q表示同一个集合,而B,C,D中P,Q的元素不相同,所以P与Q不表示同一个集合.5.已知集合M是方程x2-x+m=0的解组成的集合,若2∈M,则下列判断正确的是()A.1∈M B.0∈MC.-1∈M D.-2∈M解析:C由2∈M知2为方程x2-x+m=0的一个解,所以22-2+m=0,解得m=-2.所以方程为x2-x-2=0,解得x1=-1,x2=2.故方程的另一根为-1.6.(多选题)集合A中含有三个元素2,4,6,若a∈A,且6-a∈A,那么a 可以为()A.2 B.-2C.4 D.6解析:AC若a=2,则6-2=4∈A;若a=4,则6-4=2∈A;若a=6,则6-6=0∉A.7.已知集合P中元素x满足:x∈N,且2<x<a,又集合P中恰有三个元素,则整数a=________.解析:因为x∈N,2<x<a,且集合P中恰有三个元素,易知a=6.答案:68.若由a ,b a ,1组成的集合A 与由a 2,a +b ,0组成的集合B 相等,则a 2023+b 2023的值为________.解析:由已知可得a ≠0,因为两集合相等,又1≠0,所以b a =0,所以b =0,所以a 2=1,即a =±1,又当a =1时,集合A 不满足集合中元素的互异性,舍去,所以a =-1. 所以a 2023+b 2023=-1.答案:-19.已知集合A 含有两个元素a -3和2a -1,a ∈R .(1)求实数a 的取值范围;(2)若a ∈A ,求实数a 的值.解:(1)如果a -3=2a -1,则a =-2.由于a -3,2a -1是集合A 含有的两个元素,所以实数a ≠-2.(2)因为a ∈A ,所以a =a -3或a =2a -1.当a =a -3时,0=-3,不成立;当a =2a -1时,a =1,此时A 中有两个元素-2,1,符合题意,综上所述,实数a 的值为1.B 能力进阶练10.若集合A 的元素y 满足y =x 2+1,集合B 的元素(x ,y )满足y =x 2+1(A ,B 中x ∈R ,y ∈R ),则下列选项中元素与集合的关系都正确的是( )A .2∈A 且2∈BB .(1,2)∈A 且(1,2)∈BC .2∈A 且(3,10)∈BD .(3,10)∈A 且2∈B解析:C 集合A 中的元素为y ,是数集,又y =x 2+1≥1,故2∈A ;集合B 中的元素为点(x ,y )且满足y =x 2+1,经验证,(3,10)∈B ,故选C .11.(多选题)由a 2,2-a ,4组成一个集合A ,且集合A 中含有3个元素,则实数a 的取值不可能是( )A .1B .-2C .-1D .2解析:ABD 由题意知a 2≠4,2-a ≠4,a 2≠2-a ,解得a ≠±2,且a ≠1,即a 的取值不可能是1,±2.12.已知集合A 含有两个元素1和2,集合B 表示方程x 2+ax +b =0的解组成的集合,且集合A 与集合B 相等,则a =________,b =________.解析:因为集合A 与集合B 相等,且1∈A ,2∈A ,所以1∈B ,2∈B ,即1,2是方程x 2+ax +b =0的两个实数根.所以⎩⎨⎧1+2=-a ,1×2=b ,所以⎩⎨⎧a =-3,b =2.答案:-3 213.已知集合A 的元素是a ,b ,2,集合B 的元素是2,b 2,2a ,若A =B ,求实数a ,b 的值.解:由已知A =B 得⎩⎨⎧a =2a ,b =b 2,① 或⎩⎨⎧a =b 2,b =2a ,② 解①得⎩⎨⎧a =0,b =0或⎩⎨⎧a =0,b =1.解②得⎩⎨⎧a =0,b =0或⎩⎪⎨⎪⎧a =14,b =12.又由集合元素的互异性,得⎩⎨⎧a =0,b =1,或⎩⎪⎨⎪⎧a =14,b =12.C 探索创新练14.已知a ∈A 且4-a ∈A ,a ∈N 且4-a ∈N ,则:(1)若A 中只有1个元素,则a =________;(2)若A有且只有2个元素,则集合A的个数是________.解析:因为a∈A且4-a∈A,a∈N且4-a∈N,若a=0,则4-a=4,此时A满足要求;若a=1,则4-a=3,此时A满足要求;若a=2,则4-a=2.此时A含1个元素.答案:(1)2(2)2。

全称量词与存在量词

全称量词与存在量词

6.已知命题p:∃x∈R,x2+4x+a=0,若命题p是假命题,则实数a的取
值范围是( B )
A.0<a<4
B.a>4
C.a<0
D.a≥4
解析:B 因为p是假命题,所以方程x2+4x+a=0没有实数根,即Δ=16
-4a<0,即a>4.
11
必备知识 自主学习 关键能力 互动探究 课时规范训练
解:(1)是全称量词命题,表示为∀x∈N,x2≥0. (2)是存在量词命题,表示为∃x∈R,满足x2≥2. (3)是存在量词命题,表示为∃x∈R,|x|≤0. (4)是存在量词命题,∃a∈R,函数y=ax+b的值随x的增大而增大.
12
必备知识 自主学习 关键能力 互动探究 课时规范训练
(1)含参数的全称量词命题为真时,常与不等式恒成立有关,可根据有 关代数恒等式,确定参数的取值范围;
(2)含参数的存在量词命题为真时,常转化为方程或不等式有解问题来 处理,可借助根的判别式等知识解决.
21
必备知识 自主学习 关键能力 互动探究 课时规范训练
跟踪训练 2.已知集合A={x|-2≤x≤5},B={x|m+1≤x≤2m-1},且B≠∅,若 命题p:“∀x∈B,x∈A”是真命题,求m的取值范围.
2 1
3 4 5 6 7 8 9 10 11 12 13 14
25
必备知识 自主学习 关键能力 互动探究 课时规范训练
解析:B A 中,锐角三角形的内角是锐角或钝角是全称量词命题;B 中, 当 x=0 时,x2=0,所以 B 既是存在量词命题又是真命题;C 中,因为 3+(-
3)=0,所以 C 是假命题;D 中对于任一个负数 x,都有1x<0,所以 D 是假命 题.

课时规范训练(四)离子反应及发生条件

课时规范训练(四)离子反应及发生条件

课时规范训练(四)[基础对点练]题组一离子反应及其发生的条件1.对于离子反应,下列说法正确的是()A.参加离子反应的一定都是电解质B.任何一种离子的浓度在离子反应中一定减小C.自由离子之间的反应不能在固体物质中进行D.没有沉淀、气体、水生成的反应就不是离子反应解析:C参加离子反应的不一定都是电解质,如Fe+2H+===Fe2++H2↑中Fe既不是电解质也不是非电解质,A错误;离子反应中不是每一种离子的浓度都减小,B错误;电解质在固态时不能发生电离,C正确;没有沉淀、气体、水生成的反应也可能是离子反应,如H++CH3COO-===CH3COOH,D错误。

2.下列各组物质间的反应不属于离子反应的是()A.锌和稀硫酸反应B.氯化钠溶液和硝酸银溶液反应C.木炭和氧气反应D.烧碱溶液和氯化铁溶液反应解析:C选项C中的反应不在溶液中进行且无离子参加或生成,不属于离子反应。

3.甲、乙、丙、丁四位同学分别进行实验,测定四份不同澄清溶液的成分,记录如下:其中记录合理的是(A.甲B.乙C.丙D.丁解析:D甲中会有BaSO4沉淀,乙中会有CaCO3沉淀,丙中H+与CO2-3反应生成CO2气体,丁中三种物质不发生反应,可共存,故选D。

题组二离子方程式的书写4.下列化学反应的离子方程式正确的是()A.向碳酸镁中滴加稀盐酸:CO2-3+2H+===CO2↑+H2OB.碳酸钡与硫酸溶液反应:Ba2++SO2-4===BaSO4↓C.氢氧化铜加入稀盐酸中:Cu(OH)2+2H+===Cu2++2H2OD.醋酸溶液与氢氧化钠溶液反应:H++OH-===H2O解析:C A项,MgCO3为难溶性盐,应写化学式;B项,BaCO3为难溶性盐,应写化学式,正确的离子方程式为BaCO3+2H++SO2-4===BaSO4+CO2↑+H2O;D项,CH3COOH为弱酸,应写化学式。

5.下列离子方程式书写正确的是()A.稀硫酸与铁丝制取氢气:2Fe+6H+===2Fe3++3H2↑B.向氢氧化铜悬浊液中加入稀硫酸:OH-+H+===H2OC.碳酸钙与稀盐酸制备二氧化碳:CO2-3+2H+===CO2↑+H2OD.CuSO4溶液中滴加Ba(OH)2溶液:Cu2++SO2-4+Ba2++2OH-===BaSO4↓+Cu(OH)2↓解析:D铁与稀硫酸反应生成硫酸亚铁和氢气,不能生成铁离子,A错误;氢氧化铜、碳酸钙难溶于水,不能拆成离子形式,B、C错误;D项所发生反应的离子方程式书写正确。

高一生物课时规范复习训练题3

高一生物课时规范复习训练题3

1.各种育种方法或技术都有其优劣之处,下列相关叙述不正确的是()A.传统的育种方法周期长,可选择的范围有限B.通过人工诱变,人们有目的地选育新品种,能避免育种的盲目性C.杂交育种难以克服远缘杂交不亲和的障碍,过程繁杂缓慢,效率低D.基因工程可以实现基因在不同物种之间的转移,人们可以定向选育新品种解析:杂交育种的缺点:育种周期长,可选择的范围有限;诱变育种的原理是基因突变,突变是不定向的,避免不了盲目性;杂交育种必须选择同种生物进行杂交,不能克服远缘杂交不亲和的障碍。

基因工程可在不同物种之间进行基因转移,定向地改造生物的某些性状。

答案:B2.(2013·广州模拟)下列各项育种方式中培育原理相同的一组是()A.太空椒与抗虫棉B.无子番茄和“番茄—马铃薯”C.高产优质杂交水稻和青霉素高产菌种D.无子西瓜和八倍体小黑麦解析:生物的育种方式,诱变育种,其育种原理是基因突变,如太空椒、青霉素高产菌种;基因工程育种,其育种原理是基因重组,如抗虫棉;细胞工程育种,其育种原理是基因重组,如“番茄—马铃薯”;杂交育种,其原理为基因重组,如杂交水稻;多倍体育种,其育种原理是染色体变异,如无子西瓜、八倍体小黑麦;单倍体育种,其原理是染色体变异,如花药离体培养。

答案:D3.已知水稻的抗病(R)对感病(r)为显性,有芒(B)对无芒(b)为显性。

现有抗病有芒和感病无芒两个品种,要想选育出抗病无芒的新品种,生产中一般选用的育种方法是()A.诱变育种B.多倍体育种C.基因工程育种D.杂交育种解析:杂交育种能集两个亲本的不同优良性状于一身。

答案:D4.(2013·河源质检)下列有关育种的叙述中,错误的是() A.用于大田生产的优良品种不一定是纯合子B.通过植物组织培养技术培育脱毒苗,筛选培育抗病毒新品种C.杂交育种可用于家畜、家禽的育种D.为了避免对三倍体无子西瓜年年制种,可利用植物组织培养快速繁殖解析:通过植物组织培养技术培育的脱毒苗没有病毒,但不一定能抗病毒。

课时规范训练(十一)物质的量,摩尔质量

课时规范训练(十一)物质的量,摩尔质量

课时规范训练(十一)[基础对点练]题组一物质的量、阿伏加德罗常数1.下列说法错误的是()A.物质的量是表示含有一定数目粒子的集合体的物理量B.使用摩尔作单位时必须指明微粒的名称C.物质的量是一个基本物理量,表示物质所含粒子多少D.物质的量适用于计量分子、原子、离子等粒子解析:C物质的量是含有一定数目粒子的集合体的物理量,其单位是摩尔,使用摩尔所指的对象是微粒,而微粒种类繁多,需要指明其名称;物质的量不是表示物质所含粒子的多少,而是表示物质所含一定数目的粒子集合体的多少;构成物质的粒子除原子外,还有分子、离子等,故选C。

2.下列叙述正确的是()A.1 mol任何物质都含有6.02×1023个分子B.摩尔只能用来计量纯净物中微观粒子数目C.摩尔是物质的量的单位,简称摩,符号molD.我们把含有6.02×1023个粒子的任何粒子的集合体计量为1摩尔解析:C物质不一定都是由分子组成的,可能是由原子或离子组成的,摩尔是物质的量的单位,1 mol任何粒子的粒子数约为6.02×1023,A错误;摩尔既能用来计量纯净物中微观粒子数目,也能用来计量混合物中微观粒子数目,B错误;含有6.02×1023个粒子的集合体计量不一定为1 mol,如含有6.02×1023个O 的O2的物质的量为0.5 mol,D错误。

3.现有CO、CO2、O3三种气体,它们分别都含有1 mol氧原子,则三种气体的物质的量之比为()A.1∶1∶1 B.1∶2∶3C.3∶2∶1 D.6∶3∶2解析:D含有1 mol氧原子的CO、CO2、O3三种气体的物质的量分别为1mol 、12 mol 和13 mol ,则n (CO)∶n (CO 2)∶n (O 3)=1 mol ∶12 mol ∶13mol =6∶3∶2。

题组二 摩尔质量4.下列关于摩尔质量的说法正确的是( )A .硫酸和磷酸(H 3PO 4)的摩尔质量相等,都是98 g·mol -1B .1 mol H 2SO 4的质量与H 2SO 4的摩尔质量相同C .摩尔质量与该物质的相对分子质量或相对原子质量相等D .某物质的物质的量越多,对应的摩尔质量越大解析:A B 项,二者的数值相同,但单位分别为g 和g·mol -1,错误;C 项,以g·mol -1为单位时,摩尔质量的数值与该物质的相对分子质量或相对原子质量相等,错误;D 项,摩尔质量不随物质的量发生变化,错误。

2019高三数学(北师大版理科)一轮训练题课时规范练55 分类加法计数原理与分步乘法计数原理 Word版含解析

2019高三数学(北师大版理科)一轮训练题课时规范练55 分类加法计数原理与分步乘法计数原理 Word版含解析

课时规范练分类加法计数原理与分步乘法计数原理基础巩固组.已知两条异面直线上分别有个点和个点,则这个点可以确定不同的平面个数为().现有名同学去听同时进行的个课外知识讲座,每名同学可自由选择其中的一个讲座,不同选法的种数是(). ××××.现有种不同颜色要对如图所示的四个部分进行着色,要求有公共边界的两块不能用同一种颜色,则不同的着色方法共有()种种种种.有共个人,从中选名组长和名副组长,但不能当副组长,则不同选法的种数是().我们把各个数位上的数字之和为的四位数称为“六合数”(如是“六合数”),则“六合数”中首位为的共有()个个个个.某同学有同样的画册本,同样的集邮册本,从中取出本赠送给位朋友,每位朋友本,则不同的赠送方法共有()种种种种.高三年级的三个班去甲、乙、丙、丁四个工厂参加社会实践,但去哪个工厂可自由选择,甲工厂必须有班级去,则不同的分配方案有()种种种种.(福建漳州质检)将,…这个数字填在如图的个空格中,要求每一行从左到右,每一列从上到下分别依次增大.当固定在图中的位置时,填写空格的方法有()种种种种〚导学号〛.(山东济宁模拟)若甲、乙两人从门课程中各选修门,则甲、乙所选的课程中恰有门相同的选法共有种..三边长均为正整数,且最大边长为的三角形的个数是.综合提升组.从中选一个数字,从中选两个数字,组成无重复数字的三位数,其中奇数的个数为().某体育彩票规定:从至共个号中抽出个号为一注,每注元.某人想从至中选个连续的号,从至中选个连续的号,从至中选个号,从至中选个号组成一注,则这人把这种特殊要求的号买全,至少要花()元元元元.(河南商丘二模,理)高考结束后高三年级的名同学准备拼车去旅游,其中一班、二班、三班、四班每班各名,分别乘甲、乙两辆汽车,每车限坐名同学(乘同一辆车的名同学不考虑位置),其中一班的名同学是孪生姐妹,需乘同一辆车,则乘坐甲车的名同学中恰有名同学是来自同一班级的乘坐方式共有()种种种种。

高考数学一轮总复习课时规范练35直线平面平行的判定与性质北师大版

高考数学一轮总复习课时规范练35直线平面平行的判定与性质北师大版

课时规范练35直线、平面平行的判定与性质基础巩固组1.下列说法正确的是()A.若两条直线与同一条直线所成的角相等,则这两条直线平行B.若一个平面内有三个点到另一个平面的距离相等,则这两个平面平行C.若一条直线分别平行于两个相交平面,则一定平行它们的交线D.若两个平面都平行于同一条直线,则这两个平面平行2.(2021浙江宁海中学)已知三个不同的平面α,β,γ和直线m,n,若α∩γ=m,β∩γ=n,则“α∥β”是“m∥n”的()A.充分不必要条件B.必要不充分条件C.充要条件D.既不充分也不必要条件3.在空间四边形ABCD中,E,F分别为AB,AD上的点,且AE∶EB=AF∶FD=1∶4,H,G分别为BC,CD的中点,则()A.BD∥平面EFG,且四边形EFGH是平行四边形B.EF∥平面BCD,且四边形EFGH是梯形C.HG∥平面ABD,且四边形EFGH是平行四边形D.EH∥平面ADC,且四边形EFGH是梯形4.(2021湖南雅礼中学二模)如图,E是正方体ABCD-A1B1C1D1的棱C1D1上的一点E(不与端点重合),BD1∥平面B1CE,则()A.BD1∥CEB.AC1⊥BD1C.D1E=2EC1D.D1E=EC15.如图,AB∥平面α∥平面β,过A,B的直线m,n分别交α,β于点C,E和D,F.若AC=2,CE=3,BF=4,则BD的长为()A.65B.75C.85D.956.在正方体ABCD-A1B1C1D1中,E,F,G分别是A1B1,B1C1,BB1的中点,下列四个推断中正确的是()①FG∥平面AA1D1D ②EF∥平面BC1D1③FG∥平面BC1D1④平面EFG∥平面BC1D1A.①③B.①④C.②③D.②④7.过正方体ABCD-A1B1C1D1的三个顶点A1,C1,B的平面与底面ABCD所在平面的交线为l,则l与A1C1的位置关系是.8.如图是长方体被一平面所截得的几何体,四边形EFGH为截面,则四边形EFGH的形状为.9.已知四棱柱ABCD-A1B1C1D1中,AD∥BC,AD=2BC,E,F分别为CC1,DD1的中点.求证:平面BEF∥平面AD1C1.综合提升组10.如图,在下列四个正方体中,A,B为正方体的两个顶点,M,N,P为所在棱的中点,则在这四个正方体中,直线AB与平面MNP不平行的是()11.如图,在长方体ABCD-A1B1C1D1中,AD=DD1=1,AB=√3,E,F,G分别为AB,BC,C1D1的中点,点P在平面ABCD内,若直线D1P∥平面EFG,则线段D1P长度的最小值是()A.2√23B.√62C.√52D.√7212.如图,四边形ABCD是空间四边形,E,F,G,H分别是四边上的点,它们共面,且AC∥平面EFGH,BD∥平面EFGH,AC=m,BD=n,则当四边形EFGH是菱形时,AE∶EB=.13.(2021山东临沂月考)在正方体ABCD-A1B1C1D1中,E为棱CD上一点,且CE=2DE,F为棱AA1的中点,且平面BEF与DD1交于点G,与AC1交于点H,则DGDD1=,AHHC1=.14.在正方体ABCD-A1B1C1D1中,E,F分别为D1C1,B1C1的中点,AC∩BD=P,A1C1∩EF=Q,如图.(1)若A1C交平面EFBD于点R,证明:P,Q,R三点共线;(2)线段AC上是否存在点M,使得平面B1D1M∥平面EFBD,若存在,确定M的位置;若不存在,说明理由.创新应用组15.(2021北京朝阳二模)已知棱长为1的正方体ABCD-A1B1C1D1,M是BB1的中点,动点P在正方体内部或表面上,且MP∥平面ABD1,则动点P的轨迹所形成区域的面积是()B.√2C.1D.2A.√2216.如图所示,侧棱与底面垂直,且底面为正方形的四棱柱ABCD-A1B1C1D1中,AA1=2,AB=1,M,N分别在线段AD1,BC上移动,始终保持MN∥平面DCC1D1,设BN=x,MN=y,则函数y=f(x)的图象大致是()课时规范练35 直线、平面平行的判定与性质1.C 解析:由两条直线与同一条直线所成的角相等,可知两条直线可能平行,可能相交,也可能异面,故A 错误;若一个平面内有三个点到另一个平面的距离相等,则这两个平面可能平行或相交,故B 错误; 设α∩β=l ,m ∥α,m ∥β,利用线面平行的性质定理,在平面α中存在直线a ∥m ,在平面β中存在直线b ∥m ,所以可知a ∥b ,根据线面平行的判定定理,可得b ∥α,然后根据线面平行的性质定理可知b ∥l ,所以m ∥l ,故C 正确;若两个平面都平行于同一条直线,则两个平面可能平行,也可能相交,故D 错误.故选C . 2.A 解析:根据面面平行的性质定理,可知当“α∥β”时,有“m ∥n ”,故充分性成立;反之,当m ∥n 时,α,β可能相交(如图),故必要性不成立. 所以“α∥β”是“m ∥n ”的充分不必要条件. 故选A .3.B 解析:如图,由题意,得EF ∥BD ,且EF=15BD ,HG ∥BD ,且HG=12BD ,∴EF ∥HG ,EF ≠HG ,∴四边形EFGH 是梯形.又EF ∥BD ,EF ⊄平面BCD ,BD ⊂平面BCD ,∴EF ∥平面BCD.故选B .4.D 解析:如图,设B 1C ∩BC 1=O ,则平面BC 1D 1∩平面B 1CE=OE.∵BD 1∥平面B 1CE ,根据线面平行的性质可得D 1B ∥EO ,∵O为B1C的中点,∴E为C1D1中点,∴D1E=EC1.故选D.5.C解析:由AB∥α∥β,易证ACCE =BDDF,即ACAE =BDBF,所以BD=AC·BFAE =2×45=85.故选C.6.A解析:∵在正方体ABCD-A1B1C1D1中,E,F,G分别是A1B1,B1C1,BB1的中点,∴FG∥BC1,∵BC1∥AD1,∴FG∥AD1.∵FG⊄平面AA1D1D,AD1⊂平面AA1D1D,∴FG∥平面AA1D1D.故①正确;∵EF∥A1C1,A1C1与平面BC1D1相交,∴EF与平面BC1D1相交.故②错误;∵E,F,G分别是A1B1,B1C1,BB1的中点,∴FG∥BC1,∵FG⊄平面BC1D1,BC1⊂平面BC1D1,∴FG∥平面BC1D1.故③正确;∵EF与平面BC1D1相交,∴平面EFG与平面BC1D1相交,故④错误.故选A.7.平行解析:因为过A1,C1,B三点的平面与底面A1B1C1D1的交线为A1C1,与底面ABCD的交线为l,且正方体的两底面互相平行,则由面面平行的性质定理知l∥A1C1.8.平行四边形解析:因为平面ABFE∥平面CDHG,平面EFGH∩平面ABFE=EF,平面EFGH∩平面CDHG=HG,所以EF∥HG.同理EH∥FG,所以四边形EFGH是平行四边形.9.证明取AD的中点G,连接BG,FG.因为E,F分别为CC1,DD1的中点,所以C1D1 CD EF,因为C1D1⊂平面AD1C1,EF⊄平面AD1C1,所以EF∥平面AD1C1.因为AD∥BC,AD=2BC,所以GD BC,即四边形BCDG是平行四边形,所以BG CD,所以BG EF,即四边形EFGB是平行四边形,所以BE∥FG.因为F,G分别是DD1,AD的中点,所以FG∥AD1,即BE∥AD1.因为AD1⊂平面AD1C1,BE⊄平面AD1C1,所以BE∥平面AD1C1.又BE⊂平面BEF,FE⊂平面BEF,BE∩EF=E,所以平面BEF∥平面AD1C1.10.C解析:对于选项A,由图可知AC∥MN,CB∥NP,故根据面面平行的判定定理可知,平面ABC∥平面MNP.又因为AB⊂平面ABC,所以直线AB∥平面MNP,故A正确;对于选项B,根据题意得AB∥NP,结合直线与平面平行的判定定理,可知直线AB∥平面MNP,故B正确;对于选项C,由题意可知,平面MNP内不存在任意一条直线与直线AB平行,故直线AB与平面MNP不平行,故C错误;对于选项D,由图可知AC∥NP,CB∥NM,故根据面面平行的判定定理可知,平面ABC∥平面MNP,又因为AB⊂平面ABC,所以直线AB∥平面MNP,故D正确.故选C.11.D解析:如图,连接D1A,AC,D1C,因为E,F,G分别为AB,BC,C1D1的中点,所以AC∥EF,EF⊄平面ACD1,则EF∥平面ACD1.因为EG∥AD1,所以同理得EG∥平面ACD1,又EF∩EG=E,得平面ACD1∥平面EFG.因为直线D1P∥平面EFG,所以点P在直线AC上,在△ACD1中,有AD1=√2,AC=2,CD1=2,所以S△AD1C =12×√2×√22-(√22)2=√72,故当D 1P ⊥AC 时,线段D 1P 的长度最小,有S △AD 1C =12×AC ×D 1P ,解得D 1P=√7212×2=√72. 故选D .12.m ∶n 解析:∵AC ∥平面EFGH ,BD ∥平面EFGH ,AC ⊂平面ABC ,BD ⊂平面ABD ,平面ABC ∩平面EFGH=EF ,平面ABD ∩平面EFGH=EH ,∴EF ∥AC ,EH ∥BD ,∴EF=BEABm ,EH=AEABn.又四边形EFGH 是菱形, ∴BEAB m=AEAB n ,∴AE ∶EB=m ∶n.13.1638解析:∵ABCD-A 1B 1C 1D 1是正方体,∴平面A 1B 1BA ∥平面C 1D 1DC. ∵BF ⊂平面A 1B 1BA , ∴BF ∥平面CDD 1C 1.∵平面BFGE ∩平面C 1D 1DC=GE , 则BF ∥GE ,则AF AB =DG DE ,即DG DE =12. 又CE=2DE ,则DG DD 1=16.连接AC 交BE 于点M ,过点M 作MN ∥CC 1,MN 与AC 1交于点N ,连接FM ,则H 为FM 与AC 1的交点. ∵AB ∥CE ,∴AM MC =AB CE =32,则AN NC 1=AM MC =32.∴MN CC 1=35,∴MN FA =65=HN AH ,故AH HC 1=38.14.(1)证明因为AC ∩BD=P ,AC ⊂平面AA 1C 1C ,BD ⊂平面EFBD ,所以,点P 是平面AA 1C 1C 和平面EFBD 的一个公共点,同理可知,点Q 也是平面AA 1C 1C 和平面EFBD 的公共点,即平面AA 1C 1C 和平面EFBD 的交线为PQ.因为A 1C ∩平面EFBD=R ,A 1C ⊂平面AA 1C 1C ,所以点R 也是平面AA 1C 1C 和平面EFBD 的公共点,由基本事实3可知,R ∈PQ ,因此,P ,Q ,R 三点共线.(2)解存在点M ,使得平面B 1D 1M ∥平面EFBD.如图所示,设B 1D 1∩A 1C 1=O ,过点O 作OM ∥PQ 交AC 于点M ,下面证明平面B 1D 1M ∥平面EFBD. 因为E ,F 分别为D 1C 1,B 1C 1的中点,所以B 1D 1∥EF.因为B 1D 1⊄平面EFBD ,EF ⊂平面EFBD ,所以B 1D 1∥平面EFBD.又OM ∥PQ ,OM ⊄平面EFBD ,PQ ⊂平面EFBD ,所以OM ∥平面EFBD.因为OM ∩B 1D 1=O ,OM ,B 1D 1都在平面B 1D 1M 中,因此,平面B 1D 1M ∥平面EFBD.因为E ,F 分别为D 1C 1,B 1C 1的中点,所以EF ∥B 1D 1,且EF ∩OC 1=Q ,则点Q 为OC 1的中点, 易知A 1C 1∥AC ,即OQ ∥PM ,又OM ∥PQ ,所以四边形OMPQ 为平行四边形,所以PM=OQ=12OC 1=14A 1C 1=14AC.因为四边形ABCD 为正方形,且AC ∩BD=P ,则P 为AC 的中点,所以点M 为AP 的中点,所以AM=12AP=14AC ,因此,线段AC 上存在点M ,且AM AC =14时,平面B 1D 1M ∥平面EFBD.15.A 解析:如图所示,E ,F ,G ,M 分别是AA 1,A 1D 1,B 1C 1,BB 1的中点,则EF ∥AD 1,EM ∥AB ,所以EF ∥平面ABD 1,EM ∥平面ABD 1,且EF ∩EM=E ,所以平面ABD 1∥平面EFGM ,故点P 的轨迹为矩形EFGM.MB 1=B 1G=12,所以MG=√22,所以S 矩形EFGM =1×√22=√22. 故选A . 16.C 解析:过点M 作MQ ∥DD 1,交AD 于点Q ,连接QN.∵MN ∥平面DCC 1D 1,MQ ∥平面DCC 1D 1, MN ∩MQ=M ,∴平面MNQ ∥平面DCC 1D 1.又平面ABCD 与平面MNQ 和平面DCC 1D 1分别交于QN 和DC , ∴NQ ∥DC ,可得QN=CD=AB=1,AQ=BN=x.∵MQ AQ =DD 1AD =2,∴MQ=2x. 在Rt △MQN 中,MN 2=MQ 2+QN 2,即y 2=4x 2+1,∴y 2-4x 2=1(0≤x<1),又y>0,∴y=√4x 2+1,∴函数y=f (x )的图象为焦点在y 轴上的双曲线上支的一部分.故选C .。

2014高考历史一轮复习限时规范训练第35课时

2014高考历史一轮复习限时规范训练第35课时

第35课时专制下的启蒙和理性之光与浪漫之声(时间:45分钟满分:100分)一、选择题(本大题共12小题,每小题5分,共60分)1.(2013·山西太原学段测评)近代西方有一位思想家主张:“要寻找出一种结合的形式,使它能以全部共同的力量来防御和保障每个结合者的人身和财富……并且由于这一结合而使每一个与全体相联合的个人又只不过是在服从自己本人,并且仍然像以往一样地自由。

”这一主张的理论依据是 ()。

A.人民主权说B.三权分立说C.天赋人权说D.社会契约论解析关键信息:结合的形式、防御和保障每个结合者的人身和财富、每一个与全体相联合的个人又只不过是在服从自己本人。

本题容易错选A项。

注意区分人民主权与社会契约。

答案 D2.(2013·福建漳州质检)孟德斯鸠说:“自由就是做法律所许可的一切事情的权利。

”他主要强调()。

A.用法律保护人民的自由B.人民自由不容践踏C.自由和权利受制于法律D.法律面前人人平等解析根据材料“做法律所许可的”可以看出孟德斯鸠强调自由和权利应受制于法律,故正确答案为C项。

答案 C3.(2013·江苏扬州质检)梁启超在《国家思想变迁异同论》一文中提出,“国家者,由人民之合意结契约而成立者也,故人民当有无限之权,而政府不可不顺从民意。

……其为效也,能确立法治之主格,以保团体之利益。

”下列观点不能从材料中反映出的是()。

A.契约立国B.君主立宪C.以法治国D.人民主权解析由材料中关键信息“契约”“民意”“法治”等判断A、C、D三项都可在材料中体现,B项虽是梁启超主张,但材料无体现。

答案 B4.(2013·福州模拟)当代史学家西斯·马丁在其《思想的进步史》中说,与文艺复兴运动相比,启蒙运动在许多方面都有明显的超越。

“超越”主要表现在()。

①以“理性”为核心②将斗争矛头直接对准封建专制制度③抨击教会的腐朽④主张建立民主与法制的社会A.①②③B.①③④C.①②④D.①②③④解析关键词是“超越”,也就是不同之处。

【高考领航】2014高考生物一轮 课时规范训练:必修三 3-5-2.3(含2013模拟及解析)

【高考领航】2014高考生物一轮 课时规范训练:必修三 3-5-2.3(含2013模拟及解析)

1.初级消费者体内的能量,其去路不包括()A.用于自身生命活动B.被第二营养级的其他生物所获得C.通过呼吸作用被消耗掉D.被分解者分解散发到环境中去解析:初级消费者属第二营养级,同一营养级的生物,不能相互利用能量。

答案:B2.(2013·广东六校联考)右图为生态系统能量流动的部分图解,①代表一定的能量值。

下列相关叙述中,正确的是()A.生态系统的能量流动是循环进行的B.能量在沿食物链流动时逐级递减C.次级消费者属于第二营养级D.图中①代表呼吸作用所消耗的能量解析:生态系统能量流动是单向的、逐级递减的;次级消费者属于第三营养级;图中①代表流向分解者的能量。

答案:B3.下图是能量流动的图解,对此图解的理解不正确的是()A.图中方框的大小可表示该营养级生物所具有的能量多少B.该图中C所同化的能量为B同化能量的10%~20%C.该图中的A表示流经该生态系统的总能量D.图中所示四个营养级能量的关系为A≥B+C+D解析:A所固定的能量表示流经生态系统的总能量,A>B+C+D。

答案:D4.一片树林中,树、昆虫和食虫鸟的个体数比例关系如右图所示。

下列选项能正确表示树、昆虫、食虫鸟之间能量关系的是(选项方框面积表示能量的大小)()解析:从生物的个体数来看,一棵大树上可能有成百上千个昆虫生活着;但是从能量的角度来考虑,一棵大树的总能量要比成百上千个昆虫的总能量多很多。

答案:C5.右图中甲、乙、丙分别代表热带雨林生态系统中的三大功能类群。

下列说法正确的是()A.丙处于两个营养级,是杂食性动物B.图中表示出了两条食物链C.图中的箭头可以表示物质和能量的传递方向D.乙→丙的能量传递效率为10%~20%解析:本题的关键词为“三大功能类群”,即生产者、消费者与分解者,而分解者不属于食物链中的营养级。

据图分析,甲代表生产者,乙代表消费者,丙代表分解者。

答案:C6.右图是一般生态系统的结构模式图,在不考虑物质输入和输出的情况下,下列说法正确的是()A.能量主要是以太阳能的形式输入生态系统B.组分1、2、3分别代表生产者、消费者和分解者C.在一个幼苗茁壮成长的农田生态系统中,能量的输出量和输入量相等D.如果组分1是生产者,那么组分1代表的一定是绿色植物解析:地球上几乎所有的生态系统所需要的能量都来自太阳能,并被生产者固定为化学能;组分1、2、3分别代表生产者、分解者和消费者;农田生态系统中由于部分能量固定在植物的有机物中,因此输出量和输入量不相等;生产者除了绿色植物之外还有能进行化能合成作用的硝化细菌等生物。

2020版高考化学人教版一轮复习课时规范练35 原子结构与性质含解析

2020版高考化学人教版一轮复习课时规范练35 原子结构与性质含解析

课时规范练35原子结构与性质非选择题(共8小题,共100分)1.(10分)A、B、C、D、E、F代表6种元素。

请填空:(1)A元素基态原子的最外层有2个未成对电子,次外层有2个电子,其元素符号为。

(2)B元素的负一价离子和C元素的正一价离子的电子层结构都与氩相同,B的元素符号为,C的元素符号为。

(3)D元素的正三价离子的3d能级为半充满,D的元素符号为,其基态原子的电子排布式为。

(4)E元素基态原子的M层全充满,N层没有成对电子,只有一个未成对电子,E的元素符号为,其基态原子的电子排布式为。

(5)F元素的原子最外层电子排布式为n s n n p n+1,则n=;原子中能量最高的是电子。

2.(12分)(1)C、N、O、Al、Si、Cu是常见的六种元素。

①Si位于元素周期表第周期第族。

②N的基态原子核外电子排布式为;Cu的基态原子最外层有个电子。

③用“>”或“<”填空:原子半径电负性熔点沸点Al Si N O金刚石晶体硅CH4SiH4(2)①N、Al、Si、Zn四种元素中,有一种元素的电离能数据如下:电离能I1I2I3I4……I n/(kJ·mol-1)578 1 817 2 74511 578……则该元素是(填写元素符号)。

②基态锗(Ge)原子的电子排布式是。

Ge的最高价氯化物的分子式是。

③Ge元素可能的性质或应用有。

A.是一种活泼的金属元素B.其电负性大于硫C.其单质可作为半导体材料D.其最高价氯化物的沸点低于其溴化物的沸点3.(10分)铜、镓、硒、硅等元素的化合物是生产第三代太阳能电池的重要材料。

请回答:(1)已知高温下CuO Cu2O+O2,从铜原子价层电子结构(3d和4s轨道上应填充的电子数)变化角度来看,能生成Cu2O的原因是。

(2)硒、硅均能与氢元素形成气态氢化物,若“Si—H”中共用电子对偏向氢元素,氢气与硒反应时单质硒是氧化剂,则硒与硅的电负性相对大小为Se Si(填“>”或“<”)。

人教版英语必修1各单元必刷题对应练习(word版有答案)

人教版英语必修1各单元必刷题对应练习(word版有答案)

人教版英语选修8各单元必刷题对应练习目录人教版英语选修8各单元必刷题对应练习 (1)必修1 Unit1 Friends (1)必修1 Unit2 English around the world (6)必修1 Unit3 Travel journal (8)必修1 Unit4 Earthquake (13)必修1 Unit5 Nelson Mandela a modern hero (16)人教版英语选修1各单元必刷题对应练习参考答案 (20)必修1 Unit1 Friends答案 (20)必修1 Unit2 English around the world答案 (22)必修1 Unit3 Travel journal答案 (23)必修1 Unit4 Earthquake (25)必修1 Unit5 Nelson Mandela a modern hero答案 (27)必修1 Unit1 Friends课时规范训练(一)Ⅰ.阅读理解A(2017·黑龙江大庆模拟)It is really a happy thing to look back on the days I spent with Jennie. We met in night school. After Jennie and I had completed the required courses, we started teaching in the same school. For a time we were just casual friends, but one day, when I was telling Jennie about my problem son, we discovered we were kindred(同类的) spirits.“He's a difficult little character,” I explained.Jennie looked thoughtful.“Maybe you're only seeing him with your eyes.” She was silent for a moment and then added so ftly,“It is only with the heart that one can see rightly.” I stared at her.“You're quoting (引用) that! It's from The Little Prince, Antoine de Saint-Exupery's book for children, one of my favorites. You know it, too?”Jennie nodded.“I love it.I've read it s o often.I've practically memorized it.”Now, when I think of Jennie, I recall that book because Jennie—more than anyone I know—possessed the gift of seeing with the heart.From that moment of a treasured book shared, our friendship grew steadily. It wasn't that I didn't have an excellent relationship with my husband and son, but my mother had died shortly after my marriage, and I had neither sisters nor daughters. I realize, now,how I needed someone to share those little, seemingly unimportant things that add so much to life—things that must be shared to be fully appreciated.And it was Jennie who helped me with my fourth-grade problem child.One_day_I_was_at_my_wit's_end.“What he needs is a good beating!” I shouted.“He's probably had plenty of those,” Jennie said.“Maybe he just needs sincere praise for anything he does right, and a hug or two each day.” I followed this suggestion, and eventually, because of Jennie, I discovered a lovable littleboy.Looking back, I have to admit that she taught me so much. The days I spent with her have become one of my happiest memories.1.What does the underlined part mean in the fourth paragraph?A.I was unsure of how to deal with my son.B.I decided to give up my job.C.I faced financial difficulties.D.I was very disappointed with myself.2.How did the author and Jennie's friendship start to grow?A.They both were interested in children's education.B.They both liked a novel, The Little Prince.C.They often chatted together about their hobbies.D.They both studied in the same school.3.We learn from the text that ________.A.the author has the gift of seeing with the heartB.the author had many sisters before meeting JennieC.the author had lost her mother before her marriageD.the author seldom praised her son in the past4.The text is mainly about ________.A.how to control children properlyB.the fact that we should see nature differentlyC.the influence of friendship in lifeD.how friendship begins and disappearsB(2016·高考全国甲卷)Five years ago,when I taught art at a school in Seattle,I used Tinkertoys as a test at the beginning of a term to find out something about my students.I put a small set of Tinkertoys in front of each student,and said:“Make something out of the Tinkertoys.You have 45 minutes today—and 45 minutes each day for the rest of the week.”A few students hesitated to start.They waited to see what the rest of the class would do.Several others checked the instructions and made something according to one of the model plans provided.Another group built something out of their own imaginations.Once I had a boy who worked experimentally with Tinkertoys in his free time.His constructions filled a shelf in the art classroom and a good part of his bedroom at home.I was delighted at the presence of such a student.Here was an exceptionally creative mind at work.His presence meant that I had an unexpected teaching assistant in class whose creativity would infect (感染) other students.Encouraging this kind of thinking has a downside. I ran the risk of losing those students who had a different style of thinking.Without fail one would declare,“But I'm just not creative.”“Do you dream at night when you're asleep?”“Oh,sure.”“So tell me one of your most interesting dreams.”The student would tell something wildly imaginative.Fl ying in the sky or in a time machine or growing three heads.“That's pretty creative.Who does that for you?”“Nobody.I do it.”“Really—at night,when you're asleep?”“Sure.”“Try doing it in the daytime,in class,okay?”5.The teacher used Tinkertoys in class in order to________.A.know more about the studentsB.make the lessons more excitingC.raise the students' interest in artD.teach the students about toy design6.What do we know about the boy mentioned in Paragraph 3?A.He liked to help his teacher.B.He preferred to study alone.C.He was active in class.D.He was imaginative.7. What does the underlined word “downside” in Paragraph 4 probably mean?A.Mistake.B.Drawback.C.Difficulty. D.Burden.8.Why did the teacher ask the students to talk about their dreams?A.To help them to see their creativity.B.To find out about their sleeping habits.C.To help them to improve their memory.D.To find out about their ways of thinking.C(2017·北京东城联考)I really love my job because I enjoy working with small children and like the challenges and awards from the job. I also think my work is important. There was a time when I thought I would never have that sort of career (职业).I wasn't an excellent student because I didn't do much schoolwork. In my final term I started thinking what I might do and found I didn't have much to offer. I just accepted that I wasn't the type to have a career.I then found myself a job, looking after two little girls.It wasn't too bad at first. But the problems began when I agreed to live in, so that I would be there if my boss had to go out for business in the evening. We agreed that if I had to work extra hours one week,she'd give me time off the next. But unfortunately, it didn't often work out.I was getting extremely tired and fed up, because I had too many late nights and early mornings with the children.One Sunday, I was in the park with the children, and met Megan who used to go to school with me. I told her about my situation. She suggested that I should do a course and get a qualification (资格证书) if I wanted to work with children. I didn't think I would be accepted because I didn't take many exams in school. She persuaded me to phone thelocal college and they were really helpful. My experience counted for a lot and I got on a part-time course.I had to leave my job with the family,and got work helping out at a kindergarten.Now I've got a full-time job there. I shall always be thankful to Megan. I wish I had known earlier that you could have a career,even if you aren't top of the class at school.9.What is the author's present job?A.Working part-time in a college.B.Taking care of children for a family.C.Helping children with their schoolwork.D.Looking after children at a kindergarten.10.When staying with the two girls' family, the author ________.A.was paid for extra workB.often worked long hoursC.got much help from her bossD.took a day off every other week11.Why did the author leave her first job?A.She found a full-time job.B.She was fed up with children.C.She decided to attend a part-time course.D.She needed a rest after working extra hours.12.What has the author learned from her own experiences?A.Less successful students can still have a career.B.Qualifications are necessary for a career.C.Hard work makes an excellent student.D.One must choose the job she likes.D(2017·甘肃兰州高三诊断)Your kids learn a lot from their friends—things you can't teach them, no matter how much you want to.Probably the most important thing kids learn is how to have peer relationships. As a parent, you can't do this, because you and your child aren't equals.For example, when you're sitting on your family room floor and your very young child asks you to pass him the blocks, you probably hand them right over. If your child is sitting with a peer and asks the same thing, though, he might not get what he wants.To succeed, your child will need to learn strategies for getting what he wants. For example, he might simply yank (猛拉) the toy out of his friend's hand. If he does that, he may learn that it's not the best way of getting what he wants because it leads to fighting and time-outs. The successful child will learn that he needs to negotiate a trade, to wait patiently, or to find something else equally fun to play with.Friends also provide emotional support, something that is part of the foundation of healthy adulthood. You can't be with your child on the elementary school playground or at the high school dance. Your child's friends will be the onesto stick_up_for her, to include her in games, and later, to tell her she looks great even if her lousy prom (糟糕的舞会) date wanders off instead of dancing with her.Friends also help your children learn. Friends solve problems together, imitate each other, and pass on knowledge.Some experts believe that the single biggest predictor of your child's success later in life is her ability to make friends. In fact, they claim it's even more important than IQ and grades.This doesn't mean that the kids who are most popular in school do the best later on in life. What matters is not the number of friends a child has but rather the quality of the relationships.This is good news for those of us who hate to think that popularity really is the Holy Grail of childhood and adolescence. While it's true that popularity has many advantages, and that many popular kids really are nice people—and not just the best dressed or best looking—it's better to have a few good friends than to have the admiration of the masses.13.By giving the example in Paragraph 3, the author wants to show that ________.A.kids can learn how to deal with the relationships when they stay with their peersB.parents should spend more spare time playing with their kidsC.kids should learn how to be polite when they ask their parents for helpD.parents can teach their kids how to be good members in the modern society in their daily life14.What does the underlined phrase “stick up for” in the fifth paragraph mean?A.Envy. B.Oppose.C.Support. D.Ignore.15.In the author's opinion,________ is more important than being popular for kids.A.getting high gradesB.having some real friendsC.developing a good habitD.knowing how to dress themselves up16.Which of the following can be the best title for the passage?A.How to Bridge the Generation GapB.What It Takes to Be a Good FriendC.Why Friends Are ImportantD.How to Be Popular in SchoolⅡ.七选五(2017·河南高考适应性测试)How to Be a Good FriendA good friend, who wouldn't want one? Ever felt yours just not good enough but don't know where to improve?____1____I used to annoy a lot of my friends before,just for the sake of having fun and from that I've learned how to be a good friend, and stay as a good friend.Listen.No one likes being interrupted when they're talking. So, when someone talks, keep yourself quiet and listen to them, especially if they're feeling down, you need to be the shoulder for them to cry on. If you have any comment to make, be sure that you word it in a way where you don't sound too negative.____2____When you just don't share the same interestor you're not in the mood to listen to them, politely let them know and ask them to understand.Always smile.3____The least you can do is, whenever you see your friends, smile and say hello. That way, if they had a bad day, you can make them feel better with your smile along with your ear, and maybe, you can share something funny to cheer them up.Don't ever lie.Everyone would hate being lied to, especially if it's by your own friend, so don't lie! It might seem alright to lie occasionally, but once you lose your friend's trust, you may lose them forever.____4____Keep secrets.Make sure you can keep a secret. If not, tell your friends straight away you cannot help yourself when it comes to secrets. Otherwise, when you let them tell you abo ut their secrets and you “accidentally” share it with someone else, you'll have your friends hating you for the rest of your life.____5____Secrets are not meant to be shared, so don't even try.A.Everyone has their bad days, and it's unavoidable.B.And that is something you surely do not want to happen.C.Well, you've come to the right place.D.A few people seem upset at you for being so direct.E.Otherwise, they may just take it as you are trying to put them down.F.This same thing happened to a good friend of mine.G.They'll probably call you “big mouth”.必修1 Unit2 English around the world课时规范训练(二)Ⅰ.完形填空If you want to learn a new language, the very first thing to think about is why. Do you need it for a __1__ reason, such as your job or your studies?__2__ perhaps you're interested in the __3__,films or music of a different country and you know how much it will help to have a good __4__ of the language.Most people learn best using a variety of __5__,but traditional classes are an ideal start for many people. They __6__ an environment where you can practice under the __7__ of someone who's good at the language. We all lead __8__ lives and learning a language takes __9__. You will have more success if you study regularly, so try to develop a __10__. It doesn't matter if you haven't got long. Becoming fluent in a language will take years, but learning to get by takes __11__.Many people start learning a language and soon give up.“I'm too __12__,” they say. Yes, children do learn languages more __13__ than adults, but research has shown that you can learn a language at any __14__.And learning is good for the health of your brain, too.I've also heard people __15__ about the mistakes they make when __16__. Well, relax and laugh about your mistakes __17__ you're much less likely to make them again.Learning a new language is never __18__. But with some work and devotion, you'll make progress. And you'll be __19__ by the positive reaction of some people when you say just a few words in __20__ own language.Good luck!1.A.technical B.political C.practical D.physical2. A.After B.So C.Though D.Or3.A.literature B.transport C.agriculture D.medicine4.A.view B.knowledge C.form D.database5.A.paintings B.regulations C.methods D.computers6.A.protect B.change C.respect D.provide7.A.control B.command C.guidance D.pressure8.A.busy B.happy C.simple D.normal9.A.courage B.time C.energy D.place10.A.theory B.business C.routine D.project11.A.some risks B.a lot less C.some notes D.a lot more12.A.old B.nervous C.weak D.tired13.A.closely B.quickly C.privately D.quietly14.A.age B.speed C.distance D.school15.A.worry B.hesitate C.think D.quarrel16.A.singing B.working C.bargaining D.learning17.A.if B.and C.but D.before18.A.tiresome B.hard C.interesting D.easy19.A.blamed B.amazed C.interrupted D.informed20.A.their B.his C.our D.yourⅡ.语法填空Keeping a diary in English is one of the 1.____________(effect) ways to improve our English writing ability.2.____________(compare) with other forms of writing, it is shorter and takes 3.____________(little) time. It can help us to develop the habit of thinking in English.4.____________ we persist in this practice, gradually we'll learn how to express ourselves in English. In keeping a diary in English, we certainly run up against many 5.____________(difficult). In the first place, it often happens that we have trouble finding appropriate words and phrases to give 6.____________(express) to our mind. Secondly, there are many idiomatic ways of saying things in Chinese. And it is extremely hard for us to put them into English properly.As far as I 7.____________(concern), my 8.____________(suggest) is that we should always have a notebook and a Chinese-English dictionary within easy reach. Whenever something beats us, we can first put it down in our notebook and then consult our dictionary. We can also turn to our English teacher for help, if necessary. In short, I believe that it is 9.____________ great use to keep a diary in English for 10.____________ development of our writing skills.Ⅲ.短文改错(2017·云南第一次统一检测)A foreign student graduated with honors from a finely university in Germany. He expected to find a good job and have a bright future. But in his disappointment, he wasn't even giving the chance for aninterview! The third time he was refused, he phoned the company to ask how.“We don't employ dishonest people in Germany” is the answer. What was wrong?Shortly before he arrived in Germany, he found easy to steal subway rides. But he often rode without a ticket and was caught up three times. Now he had to pay a high price for his own behavior. We should all keep in minds:honesty is the best policy.Ⅳ.书面表达假如你是某中学的学生Tom。

2025届高考政治一轮复习课后习题课时规范练62创新思维要善于联想

2025届高考政治一轮复习课后习题课时规范练62创新思维要善于联想

课时规范练62创新思维要善于联想一、选择题1.“只有当着还没有出现大量的明显的东西的时候,当桅杆顶刚刚露出的时候,就能看出这是要发展成为大量的普遍的东西,并能掌握住它,这才叫领导。

”这要求我们()①用推理和想象来预测事物未来发展趋势②在自发联想的基础上提升创新思维能力③坚持矛盾分析法,把握事物的内部矛盾④借助形象化想象,还原事物发展的全貌A.①②B.①③C.②④D.③④2.一家美国玩具公司,从“克隆羊”多利那里得到启示,顾客只要将一张女儿的彩照和一份反映女儿特征的表格寄给公司,该公司便会给顾客一个和照片一模一样的玩具娃娃,取名为“孪生姐妹”,玩具公司的生意也因此兴旺起来。

由此可见()①联想思维具有跨越的联结性②联想思维具有非逻辑制约的畅想性③创新思维的步骤排斥逻辑推导④独特性是辩证思维的重要特征A.①②B.②③C.①④D.③④3.下图漫画《不知道转弯的人,走不远》告诉我们()①物质决定意识,一切从实际出发②要注重研究新情况,寻找新思路③认识对实践具有积极的指导作用④要有创新思维,思路具有多向性A.①②B.①③C.③④D.②④4.随着人工智能等科技领域接连取得突破性成果,中国科幻电影的创作也有了更多想象空间。

从月球基地,到机甲世界,近年来中国的科幻电影将科幻叙事与喜剧、动作等元素杂糅,以大开大合的时空想象和放眼宇宙的宏大视野为观众描绘了一个个神奇瑰丽的幻想世界。

中国科幻电影的兴起说明()①迁移和想象是展开联想的重要方式②想象有助于打破人们对事物原有联系方式认识的局限性③自觉进行联想思维训练可以提高联想思维的水平和能力④联想思维可以将毫无关联的事物进行可能的联结与思考A.①②B.①③C.②④D.③④5.在太空“出差”半年的神舟十五号航天员乘组于2023年6月4日返回东风着陆场。

针对载人飞船可能出现的各种返回模式、可能着陆地域和各种不同的地形地貌、飞船返回舱着陆后可能出现的各种异常工况、搜救过程可能遭遇的各种天气现象、航天员可能出现的各种伤情,东风着陆场开展了战法推演,完善了应急处置方案和实施细则,并按照单项训练、系统间匹配训练、空地协同训练、全系统演练等4个阶段组织了训练演练。

数学人教A版必修第二册9.2.2总体百分位数的估计课件(1)

数学人教A版必修第二册9.2.2总体百分位数的估计课件(1)
【解析】把甲、乙两名学生的数学成绩从小到大排序,可得
甲:65,71,75,76,81,86,88,89,91,94,95,107,110. 乙:78,79,83,86,88,93,98,98,99,101,103,106,114. 由13×25%=3.25,13×50%=6.5. 可得数据的第25,50百分位数为第4,7项数据,即学生甲的第25,50的百分位数 为76,88. 学生乙的第25,50的百分位数为86,98.
探究新知
2.用原始数据求百分位数
(1)求百分位数的步骤 第1步:按从小到大排列原始数据. 第2步:计算i=n×p%. 第3步:若i不是整数,而大于i的比邻整数为j,则第p百分位数为 第j项数据;若i是整数,则第p百分位数是第i项与第(i+1)项数据 的平均数. 例如: 样本量n=100,则由80%×100=80,知80%分位数即是从小到大 排列的第80个与第81个数的平均数,如果n=101,则由80%×101 =80.8,得80%分位数即是第81个数.
9.2.2 总体百分位数的估计
【学习目标】
1.理解百分位数的概念; 2.掌握求一组数据的百分位数的基本步骤; 3.通过具体问题,让学生感受总体百分位数在解决实际问题 中的运用,发展学生数学抽象、逻辑推理的核心素养。 学习重点:求百分位数的步骤,会求样本数据的百分位数,并 能利用样本数据的百分位数估计总体数据的百分位数. 学习难点:求样本数据的百分位数.
由于100×60%=60.
∴第60百分位数为第60个和第61个数据的平均数,即 7.9 8.1 8.0. 2
因此居民用户月均用水量标准应定为8.0合适.
达标练习【练】教材202页
2. 根据9.1.2节问题3中男生的样本数据,请你估计树人中学高一年级男生的第 25,50,75百分位数. 如果要减少估计的误差,你觉得应该怎么做?
  1. 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
  2. 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
  3. 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。

课时规范训练(三十五)Ⅰ.阅读理解AMore students than ever before are taking a gap-year(间隔年)before going to university.It used to be called the “year off” between school and university.The gap-year phenomenon originated(起源)with the months left over to Oxbridge applicants between entrance exams in November and the start of the next academic year.This year,25,310 students who have accepted places in higher education institutions have put off their entry until next year,according to statistics on university entrance provided by the University and College Admissions Service(UCAS).That is a record 14.7% increase in the number of students taking a gap year.Tony Higgins from UCAS said that the statistics are good news for everyone in higher education.“Students who take a well-planned year out are more likely to be satisfied with,and complete their chosen course.Students who take a gap year are often more mature and responsible,”he said.But not everyone is happy.Owain James,the president of the National Union of Students(NUS),argued that the increase is evidence of student hardship -young people are being forced into earning money before finishing their education.“New students are now aware that they are likely to leave university up to £15,000 in debt.It is not surprising that more and more students are taking a gap year to earn money to support their study for the degree.NUS statistics show that over 40% of students are forced to work during term time and the figure increases to 90% during vacation periods,”he said.1.What do we learn about the gap year from the text?A.It is flexible in length. B.It is a time for relaxation.C.It is increasingly popular. D.It is required by universities. 2.According to Tony Higgins,students taking a gap year________ .A.are better prepared for college studies.B.know a lot more about their future jobsC.are more likely to leave university in debtD.have a better chance to enter top universities3.How does Owain James feel about the gap-year phenomenon?A.He's puzzled.B.He's worried. C.He's surprised. D.He's annoyed. 4.What would most students do on their vacation according to NUS statistics?A.Attend additional courses. B.Make plans for the new term.C.Earn money for their education. D.Prepare for their graduate studies.B(2017·福建福州质检)Some people are so rude!Who sends an e­mail or a text message that just says “Thank you”?Who leaves a voicemail message rather than texts you? Who asks for a fact easily found on Google? Don't these people realize that they're wasting your time?Maybe I'm the rude one for not appreciating life's little politeness. But many socially agreed standards just don't make sense to people drowning in digital communication.In texts, you don't have to declare who you are or even say hello. E-mail is slower than a text. V oicemail is a now impolite way of trying to connect.My father learned this lesson after leaving me a dozen voicemail messages, none of which I listened to. Exasperated,_he called my sister to express his dissatisfaction that I never returned his phone calls.“Why are you leaving him voicemail?”my sister asked.“Just text him.”In the age of the smartphone, there is no reason to ask once-acceptable questions about the weather forecast, a business's phone number, or directions to a house, a restaurant, which can be easily found on Google Maps. But people still ask these things. And when you answer, they respond with a thank-you e-mail.How to handle these differing standards? Consider your audience. Some people, especially older ones, appreciate a thankyou message. Others, like me, want no reply.The anthropologist(人类学家)Margaret Mead once said that in traditional societies, the young learn from the old. But in modern societies, the old can also learn from the young. Here's hoping that politeness never goes out of fashion but that time-wasting forms of communication do.5.What does the underlined word “Exasperated” mean in the fifth paragraph?A.Worried. B.Annoyed. C.Surprised. D.Tired.6.Why didn't the writer reply to his father?A.He didn't want to talk with his father.B.He liked text messages better.C.He didn't receive any voicemail messages.D.He enjoyed checking his voicemail.7.Which of the following does the writer agree to?A.Dealing with voicemail should vary with each individual.B.Declaring who they are or saying hello in texts is necessary.C.People needn't learn from one another in traditional societies.D.People needn't turn to Google Maps for help when in trouble.8.What's the best title for this passage?A.Nowadays:what means should we use in communicationB.Nowadays:do you like leaving others a voicemail messageC.Nowadays:what should we do with text messagesD.Nowadays: do you need a thank-you messageC(2017·天星教育第一次大联考)Last weekend I visited Rome for the first time. I spent three busy days in the capital of Italy, seeing lots of tourist attractions and walking down streets lit with Christmas decorations. There are a lot of things I love about the city.Rome is one of the most ancient cities in the world and is full of wonderful relics from its distant past. These monuments include the Roman Forum and the vast Coliseum where gladiators used to fight each other until death and hunt animals coming from another country. The ruins of buildings and temples are fascinating.You can't quite believe how old they are.I studied the masterpieces of the Renaissance period at university and was very excited to see them in real life. I walked around the museum in Vatican City and saw plenty of famous sculptures. The best part of the visit was, without doubt, the Sistine Chapel ceiling, painted in the early 16th century by the great Michelangelo. It was so breathtaking that I couldn't tear my eyes away from it.In Rome, there is a lot of food on offer for tourists but some of it isn't of very good quality. I made an effort to find reliable restaurants to taste the popular meals ofthe region, like pasta with tomato,onion and bacon. I also loved eating ice cream and hot chocolate under the Christmas lights.Rome has not only lots of luxury boutiques (精品店) but also plenty of shops that were more in my price range! It was a perfect opportunity to go and buy presents for my family and friends. There was also a Christmas market, where I bought a sparkly decoration for the tree.9.The underlined word “gladiators” in the 2nd paragraph probably means“________”.A.athletes B.butchers C.invaders D. fighters 10. The author found the ruins of buildings and temples fascinating because _______.A.they represent Rome's religionB.they are relics from Rome's distant pastC.you can't help wondering how old they areD.they include the Roman Forum and the vast Coliseum11.What is mainly discussed in the 3rd paragraph?A.The great museums of Italy.B.The sculptures in Rome.C.Art-related activities during the visit.D.The achievements of the Renaissance period in Italy.12.When visiting Rome, you should be careful in choosing ________.A.the attractions B.the food C.the hotels D.the luxury boutiquesD(2017·福建南平质检)Once an old man rose early to read each morning. His grandson wanted to be just like his grandfather, so tried to emulate him every way he could.One day the grandson asked,“Grandpa, I try to read just like you do, but I don't understand most of it, and I forget whatever I do understand immediately I close the book. So what good is it for me to read?”The grandfather, who was putting coal on the fire, said,“Take this coal basket down to the river and bring me back a basket of water.”The boy did as told to, but the water leaked out before he could get the baskethome.The grandfather laughed, saying,“You'll have to move a little faster.”This time he ran faster, but again the basket emptied. Out of breath, he decided it was impossible to carry water in a basket, and he went to get a bucket. But the grandfather said,“I want a basket of water instead of a bucket of water. You're just not trying hard enough.”The boy knew what he was trying to accomplish was impossible.However, he decided to show his grandfather a third time.The boy dipped the basket into the river and ran as hard as he could. With the empty basket, he gasped(喘气说),“See Grandpa?It's useless !”“So you think it useless?”the old man asked.“Then look at the basket.”To his surprise, the boy found it washed clean of the dirty coal stains and now clean inside and out.“My child, that's what happens when you read the book. You might not understand or remember everything, but the words will change you inside and out. That is the work of reading in our lives.”13.Why did the man tell the boy to fetch a basket of water?A.The work was too much for himself.B.The work could test how fast the boy ran.C.He intended to train the boy to run faster.D.He meant to inspire the boy through an example.14.What does the underlined word “emulate” in Paragraph 1 most probably mean?A.Admire. B.Encourage. C.Challenge. D.Copy. 15.Which of the following words can be used to describe the grandfather?A.Wise and diligent. B.Healthy and smart.C.Thoughtful and loving. D.Serious and knowledgeable. 16.What would be the best title for this passage?A.The Power of Reading B.A Basket of WaterC.Old Man and His Grandson D.On Reading BooksⅡ.七选五(2017·江西临川一中期中考试)Never Over-studyWhen you spend too much time studying you will quickly lose focus and the t ime spent in studying will become “junk time”.You think you're studying but you're just sitting there re-reading the same sentence about 100 times and you're not getting anywhere.__1__Taking breaks will make you energetic again and refresh your mind. Besides, it will give your mind some time to take in what you have been doing.Plan your plan2___They actually plan what they are going to do. They actually plan the time they will study and they set goals for what will be achieved. If you want to be successful, do as successful people do. Set a plan or a goal and stick to it, which will create a routine and a routine is the first step towards developing a habit.__3__ Front up to the toughest work firstMany of us like to do the easy things first to build our confidence. That's fair enough. The only challenge with this approach is that you use up your primary energy at the start of any study period and so if you are dealing with the easy parts with your primary energy your batteries will be low when it comes time to deal with the hard part. So what happens then?__4__We all do it. We really shouldn't, though. So develop the habit of giving your primary energy to the hard tasks and completing the easy stuff last.5____Do we really have to explain this? Just turn them off for an hour. We promise the world will still be there when you log back in! Don't text your friends, don't chat while doing memory activities, don't make phone calls, just focus on what you're doing. Even if you focus on work for 15 minutes followed by 5 minutes of chatting, it's better than 30 minutes of work while also chatting! You get that right?A.Top students don't just randomly sit down and complete work.B.Positive habits decide future success.C.Taking breaks can make you get everywhere.D.You get tired and impatient and just give up.E.They make plans ahead.F.Instead, take regular breaks.G.Get off social networking sites and turn off the phone.。

相关文档
最新文档