5.mentioned6.daily7.styles8.boil四、1.inventions2.to create3.was left4.tried5.truly。6.a7.the biggest8.and9.are talking10.means五、1.But2.difficulties3.borrowing4.created5.rapidly6.better7.heart六、1.Karaoke is an activity in which people sing famous songs2.By using a touchscreen computer or an app on their phones.3.A microphone,a television and a game console with karaoke video games4.有些卡拉OK酒吧很贵，因为这些卡拉OK房间很大，装饰得很好。5.The KTV.七It is the age of science.People have created many inventions.They are useful and important.One of the most useful inventions is the plane.It makes us travel hundreds of miles in a fewhours.It carries mails quicker than the train or the ship.Doctors are using the plane to rush tofar-away places to save the lives of their patients.It is also used to fight the harmful animals thatare bad for the crops in the fields.With the help of planes,men have not only flown over theQomolangma,the world's highest mountain,but also reached the coldest place.In a word,the invention of the plane has brought many changes to people's life.【书面表达写作指导】本篇书面表达要求介绍一种发明创造。写作时，首先，引出话题；然后，选择一种发明物并介绍其用途；最后，总结全文。时态以一般现在时为主，人称以第三人称为主。写作中可能用到的词（组）：useful,,with the help of;句型：One of the most useful inventions is;lna word,the invention of the.等。

∠Q2PQ3+…+∠Q,PQ+1+…+）,其中Q.(i=1,2,3,…k,k≥3)为多面体M的所有与点P相邻的顶点，且面Q,PQ2,Q,PQ,,QPQ,遍及多面体M的所有以P为公共点的面。如图是正四面体、正八面体、正十二面体和正二十面体，若它们在各顶点处的离散曲率分标号涂别是a,b,c,d,则a,b,c,d的大小关系是(写在答只有一个正四面体正八面体正十二面体正二十面体A.a>b>c>dB.c>d>b>aC.b>a>d>cD.a>b>d>c二、选择题（本大题共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.全部选对得5分，选对但不全得2分，有选错的得0分。)9.已知向量a=(3,-2),b=(2,t)(t∈R),则A(A.另á方向相同的单位向量的坐标为21313B/当t=1时，a、b不共线C.当1=2时，a与b的夹角为锐角D.当t=4时，b在a方向上的投影向量为3213'1310.设等比数列{an}的前n项和为Sn,前n项积为Tn,若满足0

often goes to school on foot,but this morning she goes there by bike.She likes reading books,soshe often goes to the library.She likes listening to music,too.At 4:30 pm,she often walks home.Then she helps her mother cook.Sometimes,she watches TV and she does her homework in theevening.She goes to bed at about ten参考答案(One possible version客观题除外)第一部分I.1-5 CABABII.6-10 CBBAA亚11.Kitty.12.America13.She has long brown hair,big blue eyes and a round face.14.It's green.15.They are black.IV.16.6:3017.On foot18.library19.does her homework20.goes to bed第二部分V.21-25 BAACC 26-30 DDCBCVI.31-35 BBCCD 36-40 ADDCC 41-45 DACDB 46-50 BBCDAVII.51-55 CEAGB第三部分VIⅢ.56-58ADD59-61CBC62-64 BBC 65-68DBBA69-72 DBAB73.A blackboard,desks,chairs,computers and books.74.Reading75.About 25.第四部分IX.76.borrow 77.building78.hero 79.homework80.neverX.I'm Tina.Let me tell you something about my school life.I get up at 6:30 am.Then I havebreakfast at home.I usually get to school at 8:30 am.The first lesson starts at 8:50 am and I havefour lessons in the morning.I have lunch at 11:30 am.After lunch,I can go to the library to readbooks or play sports on the playground.Afternoon lessons begin at 2:00 pm and end at 4:00 pm.I

13.B【解析】A.HX为强酸，HY为弱酸，A错误；B.1.0mol/LHY溶液pH=2,c(H+)=1×10-mol/L,所以电离度为10-2÷1×100%=1%，B正确；C.体积相同、浓度均为1.0ol·L1的HX溶液、HY溶液中酸的物质的量不会随着溶液浓度的变化而变化，故消耗同浓度的NaOH溶液时体积相同，C错误；D.NaOH滴定HX,用酚酞或甲基橙作指示剂，D错误。14.D【解析】A.温度升高，所以铁腐蚀为放热反应，A正确；B.不管吸氧还是析氢腐蚀，负极都是铁失去电子，B正确；C.CD段发生了酸性条件下的析氢腐蚀，压强增大，C正确；D.BC段压强减小是因为铁在氧气、水共同作用下反应生成铁锈，铁锈主要成分为氧化铁，不是氧化亚铁，D错误。15.(15分)【答案】(1)检查装置的气密性(1分)(2)硫酸难以顺利加入、分液漏斗中溶液滴下后占据锥形瓶A中一定体积引起气体体积读数误差等(1分)(3)abc(2分，少选得1分，多选错选不得分)(4)反应放热，溶液温度升高速率加快，随反应进行，硫酸浓度减小速率减慢(2分)(5)0.00125mol/(L·s)(2分)(6)①排气泡(1分)②当滴入最后半滴标准液时，溶液由蓝色变为无色，且半分钟不恢复原色(2分)③0.184(2分)④BD(2分)【解析】(1)该实验的目的是通过氢气体积的变化来测定锌与稀硫酸反应的速率，装置漏气会影响实验结果，所以首先要检查装置的气密性。(2)实验设计的缺陷是反应生成的氢气会使装置中气体压强增大，不利于分液漏斗中的硫酸溶液顺利流下，且滴入的硫酸溶液会占据一定的体积，导致气体体积读数误差。(3)为了较准确地测量氢气的体积，除了必须检查整个装置的气密性之外，读数时应注意：①读数时要调节甲、乙的液面使其同一高度，以保证测出常压下气体的体积；②读数时视线要与凹液面最低处相；③待乙管液面不再上升时，也就是温度恢复到常温，以读出常温下气体的体积，所以正确选项为bc。(4)锌与稀硫酸反应时，溶液中氢离子浓度减小会使反应速率减小，该反应为放热反应，反应放出的热量会使反应温度升高，反应速率加快，锌与稀硫酸反应初期速率逐渐加快说明温度对反应速率的影响大于氢离子浓度对反应速率的影响，反应进行一定时间后速率逐渐减慢说明氢离子浓度对反应速率的影响大于温度对反应速率的影响。0.04L由图3可知，64s时氨气的体积为40m,则由方程式可，反应消拜有离子的浓度为25乙/m020.04L=0.08mol/L,64s内氢离子的反应速率为0.08mo1/L=0.00125mol/(L·s).64s(6)①碱式滴定管胶管中有气泡，把橡皮管向上弯曲，出口向上斜，挤捏玻璃珠，使溶液从尖嘴快速喷出，气泡即可随之排掉，这是排气泡的操作。②碘液遇到淀粉变为蓝色，加入硫代硫酸钠与碘单质反应，当碘单质消耗完，溶液蓝色褪去。所以溶液高二化学参考答案第3页（共6页）

第13期第2版参考答案“Mini Reading":1.Tom:5 years oldAmy:7 years oldJerry:9 years old2.Tom:BAmy:C Jerry:A“Word Puzzle":1.five 2.six3.three4.eight5.seven6.nine·第13期第3版参考答案“1Can.":Part A:1.two;T 2.vest;V 3.plate;P4.six;S5.water;W二、1-5 TTFTFPart B:一、1-5 BDACE二、略Part C:-、1-5 BEADC二、1-3BACPart D:1-5 BDAEC