尖子班2017年期中试题

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2017年第一学期期中考试高(一)英语试题

2017年第一学期期中考试高(一)英语试题

2017年第一学期期中考试高(一)英语试题第一部分听力(共20分)第一节听力理解(6段对话共15小题,每小题1分,满分15分)材料及问题播放两遍。

每段后有两个小题,各段播放前每小题有5秒钟的阅题时间。

请根据各段播放内容及其相关小题的问题,在5秒钟内从题中所给的A、B、C项中,选出最佳选项,并在答题卡上将该项涂黑。

Section ADirections: In this section, you will hear six conversations bet ween two speakers. For each conversation, there are several questions and each question is followed by three choices mar ked A,B and C. Listen carefully and then choose the best ans wer for each question.You will hear each conversation TWICE.Conversation 1Where does the woman work?In a bank B. In a company C. In a hotelWhat can we learn from the conversation?The person the man is looking for has just left.The man wants to contact a stranger.The man dials the wrong number.Conversation 2What’s the probable relationship between the two speakers? Old friends B. Colleagues C. Husband and wifeWhat will the woman probably do next Monday?Write a report B. Go to a meeting C. Hang out with the man Conversation 3What does the man want to buy?A white T-shirt in Size SmallA white T-shirt in Size MediumA blue T-shirt in Size SmallHow much will the man pay?$100 B. $160 C. $180Conversation 4What does the woman ask the man to do?To help her hold a partyTo go to her dance party.To help pick up her motherWhat is the man’s plan for Friday night?To fly to China B. To go to the airport C. To visit his mother Where does the conversation probably take place?At home B. In the street C. Over the phone Conversation 5Why does the woman blame the man?Because he didn’t stop at the red light.Because he hit the dog on the road.Because he almost hit a police car.What do we know about the man?He likes driving fast.He has drunk some alcohol.He has bad breath every day.What will the man do after the conversation?Stop his car B. Drive faster C. Check the dog Conversation 6How many subjects is the man good at?Three B. Four C. FiveWhy can’t the man memorize English words?Because he only tries to memorize them once.Because he tries to memorize too many words in one day.Because he never uses them after trying to memorize them. What can we learn from the conversation?The woman borrowed some grammar books from someone el se.The man will get the grammar books this Sunday.The man will follow the woman’s advice.Section BDirections: In this section, you will hear a short passage. Liste n carefully and then fill in the numbered blanks with the inform ation you have heard. Fill in each black with NO MORE THAN THREE WORDS. You will hear the short passage TWICE将所听到的正确单词填写在下列空格中,每空1分,总共5分第二部分阅读(共两节,满分40分)第一节(共11小题;每小题2分,满分22分)阅读下列短文,从每题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。

2017年八年级(上)数学期中考试试卷与答案

2017年八年级(上)数学期中考试试卷与答案

2017 年八年级(上)数学期中考试试卷(考试时间 100 分钟,试卷总分 100 分)一、选择题 (每小题 2 分,计 16 分.将正确答案的序号填写在下面的表格中 ) 1.以下轴对称图形中,对称轴条数最少的是(▲)AB C D2. 9 的平方根是( ▲ )A . 3B .± 3C .- 3D . 813.下列各数中,有理数是( ▲ )A . 8B .223D .7C . 424.下列各组线段能构成直角三角形的一组是( ▲ )A .3,4,5B .2,3,4C .1, 2, 3D .4, 5,65.根据下列已知条件,能够画出唯一△ABC 的是( ▲ )A .AB =5,BC =6,∠ A =70°B .AB =5,BC =6,AC =13C .∠ A = 50°,∠ B = 80°, AB = 8,D .∠ A = 40°,∠ B = 50°,∠ C =90°AABDE CBDC第 7 题第 6 题6.如图,△ ABD ≌△ ACE ,∠ AEC = 110°,则∠ DAE 的度数为( ▲ )A .40°B .30°C . 50°D . 60°7.如图,△ ABC 中, AB =AC , AD 是∠ BAC 的平分线,已知 AB =5, AD =3,则 BC 的长为( ▲ )A . 5B . 4C . 10D . 88. 规定:四条边对应相等,四个角对应相等的两个四边形全等.某学习小组在研究后发现判定两个四边形全等需要五组对应条件,于是把五组条件进行分类研究,并且针对二条边和三个角对应相等类型进行研究提出以下几种可能:① AB=A 1B 1, AD=A 1D 1,∠ A= ∠A 1,∠ B= ∠ B 1,∠ C=∠ C 1;② AB=A 1B 1, AD=A 1D 1,∠ A= ∠A 1,∠ B= ∠ B 1,∠ D=∠ D 1 ;③AB=A 1B 1, AD=A 1D 1,∠ B= ∠B 1,∠ C=∠ C1,∠ D=∠ D1;④ AB=A 1B 1, CD=C1D 1,∠ A= ∠A 1,∠ B= ∠ B1,∠ C=∠ C1.其中能判定四边形ABCD 和四边形 A 1B1C1D 1全等有(▲)个A . 1B. 2C. 3D. 4A A1D D1第 8 题B CB1C1二、填空题(每小题2分,共 20分)9.化简:16=▲,8▲.3=2711+ 3 10.比较大小:2▲.(用“>”、“=”或“<”填空).411.太阳的半径约是696000 千米,用科学计数法表示(精确到万位)约是 _____▲ ____千米.12.如图, PD⊥ AB, PE⊥ AC,垂足分别为 D 、 E,要使△ APD ≌△ APE,可添加的条件是▲. ( 写出一个即可 )BDC AAP DM O N(第 12题)E C A B B C第 13题第14题13.如图 ,在△ ABC 中,∠ C= 90°, AD 平分∠ BAC 交 BC 于点 D ,若 AD= 13, AC= 12,则点D 到 AB 的距离为 ______▲ _______14.如图,在△ ABC 中,∠ ABC、∠ ACB 的角平分线交于点O,MN 过点 O,且 MN∥ BC,分别交 AB、 AC 于点 M、N. 若 MN = 5cm, CN= 2cm,则 BM =▲cm15.如图,△ ABC 为等边三角形, BD 为中线,延长BC 至 E,使 CE=CD =1,连接 DE,则 DE=▲.AAA BDDP EC DB C-1O12B E C(第 15 题)第 16题第18题16.如图,正方形OABC 的边 OC 落在数轴上,点 C 表示的数为 1,点 P 表示的数为- 1,以 P 点为圆心, PB 长为半径作圆弧与数轴交于点D,则点 D 表示的数为▲.17.下面是“经过已知直线外一点作这条直线的垂线“的尺规作图过程 .已知:直线 l 和 l外一点 P.P求作:直线 l 的垂线,使它经过点Pl作法:如图,( 1)在直线 l 上任意两点 A、B;P( 2)分别以点 A, B 为圆心, AP, BP 长为l半径作弧,两弧相交于点Q;A B( 3)作直线 PQ,Q所以直线 PQ 就是所求作的垂线。

2017年重点中学八年级上学期期中数学试卷两份汇编二附答案解析

2017年重点中学八年级上学期期中数学试卷两份汇编二附答案解析

2017年重点中学八年级上学期期中数学试卷两份汇编二附答案解析中学八年级(上)期中数学试卷一、选择题:(每题3分,共24分)1.以下有理式中①,②,③,④中分式有()个.A.1 B.2 C.3 D.42.以下各组中的三条线段能组成三角形的是()A.3,4,8 B.5,6,11 C.5,6,10 D.4,4,83.以下语句是命题的是()(1)两点之间,线段最短;(2)若是两个角的和是90度,那么这两个角互余.(3)请画出两条相互平行的直线;(4)过直线外一点作已知直线的垂线.A.(1)(2)B.(3)(4)C.(2)(3)D.(1)(4)4.以下命题中,逆命题正确的选项是()A.全等三角形的面积相等B.相等的角是直角C.假设a=b,那么|a|=|b| D.对顶角相等5.以下各式变形正确的选项是()A.=B.=()2C.=D.a3•a﹣2=a﹣66.命题“垂直于同一条直线的两条直线相互平行”的题设是()A.垂直B.两条直线C.同一条直线 D.两条直线垂直于同一条直线7.A,B两地相距48千米,一艘轮船从A地顺流航行至B地,又当即从B地逆流返回A地,共用去9小时,已知水流速度为4千米/时,假设设该轮船在静水中的速度为x千米/时,那么可列方程()A.B.C.+4=9 D.8.在△ABC中,AC=5,中线AD=4,那么边AB的取值范围为()A.1<AB<9 B.3<AB<13 C.5<AB<13 D.9<AB<13二、填空题(共8小题,每题3分,总分值24分)9.当x= 时,分式=0的值等于;+= ;(a2)﹣3= .10.一种细菌半径是0.0000191米,用科学记数法表示为米.11.等腰三角形的两边的长别离为5cm和7cm,那么此三角形的周长是.12.将“互为相反数的两个数之和等于0”的逆命题写成“若是,那么”的形式,其逆命题是命题(填“真”或“假”)13.如图,在△ABC中,边AB的垂直平分线交AC于E,△ABC与△BEC的周长别离为24和14,那么AB= .14.如图,点B在AE上,∠CAB=∠DAB,要使△ABC≌△ABD,可补充的一个条件是:.(答案不唯一,写一个即可)15.用反证法证明“a>b”时,第一应该假设.16.假设关于x的分式方程﹣2=有增根,那么m的值可能是.三、解答题(共8小题,总分值72分)17.计算:(1)|﹣3|﹣(π﹣1)0﹣()﹣1(2)÷.18.解以下分式方程:(1)=(2)﹣=.19.先化简,再求值,其中x=﹣2,y=1.20.如图,点A,B,F,C在同一直线上,AB=FC,DF=EB,DF∥BE.(1)试判定AD与CE相等吗?(2)AD与CB的位置关系如何?请说明理由.21.甲队单独做一项工程恰好如期完成,乙队单独完成这项工程要比预期多用3天.假设甲、乙两队合作2天,余下的工程由乙队单独做也正好如期完成,那么规定的工期是多少天?22.如图,在等边三角形ABC中,点D,E别离在边BC,AC上,且DE∥AB,过点E作EF⊥DE,交BC的延长线于点F.(1)求∠F的度数;(2)假设CD=2,求DF的长.23.在△ABC中,AB边的垂直平分线l1交BC于D,AC边的垂直平分线l2交BC于E,l1与l2相交于点O.△ADE的周长为6cm.(1)求BC的长;(2)别离连结OA、OB、OC,假设△OBC的周长为16cm,求OA的长.24.如图,点O是等边△ABC内一点.将△BOC绕点C按顺时针方向旋转60°得△ADC,连接OD.已知∠AOB=110°.(1)求证:△COD是等边三角形;(2)当α=150°时,试判定△AOD的形状,并说明理由;(3)探讨:当α为多少度时,△AOD是等腰三角形.参考答案与试题解析一、选择题:(每题3分,共24分)1.以下有理式中①,②,③,④中分式有()个.A.1 B.2 C.3 D.4【考点】分式的概念.【分析】判定分式的依据是看分母中是不是含有字母,若是含有字母那么是分式,若是不含有字母那么不是分式.【解答】解:①、③的分母中含有字母,故①、③是分式;②、④的字母中不含字母,因此②、④是整式,而不是分式;应选B.2.以下各组中的三条线段能组成三角形的是()A.3,4,8 B.5,6,11 C.5,6,10 D.4,4,8【考点】三角形三边关系.【分析】依照三角形任意两边之和大于第三边,任意两边之差小于第三边可知.【解答】解:A、3+4=7<8,不能组成三角形;B、5+6=11,不能组成三角形;C、5+6=11>10,能够组成三角形;D、4+4=8,不能组成三角形.应选C.3.以下语句是命题的是()(1)两点之间,线段最短;(2)若是两个角的和是90度,那么这两个角互余.(3)请画出两条相互平行的直线;(4)过直线外一点作已知直线的垂线.A.(1)(2)B.(3)(4)C.(2)(3)D.(1)(4)【考点】命题与定理.【分析】判定一件情形的语句叫命题,命题都由题设和结论两部份组成,依此对四个小题进行一一分析即可;【解答】解:(1)两点之间,线段最短符合命题概念,正确;(2)若是两个角的和是90度,那么这两个角互余,符合命题概念,正确.(3)请画出两条相互平行的直线只是做了陈述,不是命题,错误;(4)过直线外一点作已知直线的垂线没有做出判定,不是命题,错误,应选A.4.以下命题中,逆命题正确的选项是()A.全等三角形的面积相等B.相等的角是直角C.假设a=b,那么|a|=|b| D.对顶角相等【考点】命题与定理.【分析】别离写出原命题的逆命题,然后进行判定即可.【解答】解:A、逆命题为:面积相等的三角形全等,错误;B、逆命题为:所有的直角都相等,正确;C、逆命题为:假设|a|=|b|,那么a=b,错误;D、逆命题为:相等的角为对顶角,错误,应选B.5.以下各式变形正确的选项是()A. = B. =()2 C. = D.a3•a﹣2=a﹣6【考点】分式的大体性质;同底数幂的乘法;负整数指数幂.【分析】依照分式的分子分母都乘以(或除以)同一个不为零整式,分式的值不变,可得答案.【解答】解:A、X=0时,无心义,故A错误;B、分子乘以b,分母乘以a,故B错误;C、分子分母都乘以y,故C正确;D、同底数幂的乘法底数不变指数相加,故D错误;应选:C.6.命题“垂直于同一条直线的两条直线相互平行”的题设是()A.垂直B.两条直线C.同一条直线 D.两条直线垂直于同一条直线【考点】命题与定理.【分析】找出已知条件的部份即可.【解答】解:命题“垂直于同一条直线的两条直线相互平行”的题设是两条直线垂直于同一条直线.应选D.7.A,B两地相距48千米,一艘轮船从A地顺流航行至B地,又当即从B地逆流返回A地,共用去9小时,已知水流速度为4千米/时,假设设该轮船在静水中的速度为x千米/时,那么可列方程()A.B.C. +4=9 D.【考点】由实际问题抽象出分式方程.【分析】此题的等量关系为:顺流时刻+逆流时刻=9小时.【解答】解:顺流时刻为:;逆流时刻为:.所列方程为: +=9.应选A.8.在△ABC中,AC=5,中线AD=4,那么边AB的取值范围为()A.1<AB<9 B.3<AB<13 C.5<AB<13 D.9<AB<13【考点】全等三角形的判定与性质;三角形三边关系.【分析】作辅助线(延长AD至E,使DE=AD=4,连接BE)构建全等三角形△BDE ≌△ADC(SAS),然后由全等三角形的对应边相等知BE=AC=5;而三角形的两边之和大于第三边、两边之差小于第三边,据此能够求得AB的取值范围.【解答】解:延长AD至E,使DE=AD=4,连接BE.那么AE=8,∵AD是边BC上的中线,D是中点,∴BD=CD;又∵DE=AD,∠BDE=∠ADC,∴△BDE≌△ADC,∴BE=AC=5;由三角形三边关系,得AE﹣BE<AB<AE+BE,即8﹣5<AB<8+5,∴3<AB<13;应选B.二、填空题(共8小题,每题3分,总分值24分)9.当x= ﹣1 时,分式=0的值等于;+= 1 ;(a2)﹣3= .【考点】分式的加减法;幂的乘方与积的乘方;负整数指数幂.【分析】分式值为0的条件是分子为0,而分母不为0;由于分母互为相反数,先变成同分母的分式再加减;先算乘方,再把负整数指数幂写出正整数指数幂的形式.【解答】解:分式值为0,需知足,解得x=﹣1.即x=﹣1时分式的值为0.===1;(a2)﹣3=a﹣6=故答案为:﹣1,1,.10.一种细菌半径是0.0000191米,用科学记数法表示为 1.91×10﹣5米.【考点】科学记数法—表示较小的数.【分析】绝对值小于1的正数也能够利用科学记数法表示,一样形式为a×10﹣n,与较大数的科学记数法不同的是其所利用的是负指数幂,指数由原数左侧起第一个不为零的数字前面的0的个数所决定.【解答】解:0.0000191米,用科学记数法表示为 1.91×10﹣5米,故答案为:1.91×10﹣5.11.等腰三角形的两边的长别离为5cm和7cm,那么此三角形的周长是17cm 或19cm .【考点】等腰三角形的性质;三角形三边关系.【分析】依照等腰三角形的性质,分两种情形:①当腰长为5cm时,②当腰长为7cm时,解答出即可.【解答】解:依照题意,①当腰长为5cm时,周长=5+5+7=17(cm);②当腰长为7cm时,周长=5+7+7=19(cm);故答案为:17cm或19cm.12.将“互为相反数的两个数之和等于0”的逆命题写成“若是两个数和为0 ,那么这两个数互为相反数”的形式,其逆命题是真命题(填“真”或“假”)【考点】命题与定理.【分析】将题设写在若是后面,结论写在那么后面即可.【解答】解:将“互为相反数的两个数之和等于0”的逆命题为“若是两个数和为0,那么这两个数互为相反数,其逆命题是真命题,故答案为:两个数和为0,这两个数互为相反数,真.13.如图,在△ABC中,边AB的垂直平分线交AC于E,△ABC与△BEC的周长别离为24和14,那么AB= 10 .【考点】线段垂直平分线的性质.【分析】依照线段垂直平分线的性质可得AE=BE,依照进而可得△BEC的周长为14,可得AC+BC=14,然后再由△ABC周长为24可得AB的长.【解答】解:∵边AB的垂直平分线交AC于E,∴AE=BE,∵△ABC周长为24,∴AB+BC+AC=24①,∵△BEC的周长为14,∴BE+EC+BC=14,∴BC+AC=14②,①﹣②得:AB=24﹣14=10,故答案为:10.14.如图,点B在AE上,∠CAB=∠DAB,要使△ABC≌△ABD,可补充的一个条件是:∠CBE=∠DBE .(答案不唯一,写一个即可)【考点】全等三角形的判定.【分析】△ABC和△ABD已经知足一条边相等(公共边AB)和一对对应角相等(∠CAB=∠DAB),只要再添加一边(SAS)或一角(ASA、AAS)即可得出结论.【解答】解:依照判定方式,可填AC=AD(SAS);或∠CBA=∠DBA(ASA);或∠C=∠D(AAS);∠CBE=∠DBE(ASA).15.用反证法证明“a>b”时,第一应该假设a≤b .【考点】反证法.【分析】反证法的步骤中,第一步是假设结论不成立,反面成立,可据此进行判定;需注意的是a>b的反面有多种情形,应一一否定.【解答】解:用反证法证明“a>b”时,应先假设a≤b.故答案为:a≤b.16.假设关于x的分式方程﹣2=有增根,那么m的值可能是﹣2 .【考点】分式方程的增根.【分析】增根是分式方程化为整式方程后产生的使分式方程的分母为0的根.把增根代入化为整式方程的方程即可求出m的值.【解答】解:方程两边都乘(x﹣2),得x﹣2(x﹣2)=﹣m∵原方程增根为x=2,∴把x=2代入整式方程,得m=﹣2,故答案为:﹣2.三、解答题(共8小题,总分值72分)17.计算:(1)|﹣3|﹣(π﹣1)0﹣()﹣1(2)÷.【考点】分式的乘除法;绝对值;实数的运算;零指数幂;负整数指数幂.【分析】结合分式的乘除法、零指数幂和负整数指数幂的概念和运算法那么进行求解即可.【解答】解:(1)原式=3﹣1﹣2=0.(2)原式=×=.18.解以下分式方程:(1)=(2)﹣=.【考点】解分式方程.【分析】两分式方程去分母转化为整式方程,求出整式方程的解取得x的值,经查验即可取得分式方程的解.【解答】解:(1)去分母得:3x﹣3=2x,解得:x=3,经查验x=3是分式方程的解;(2)去分母得:x+1﹣2x+2=4,解得:x=﹣1,经查验x=﹣1是增根,分式方程无解.19.先化简,再求值,其中x=﹣2,y=1.【考点】分式的化简求值.【分析】先把括号内的通分和把除法运算化为乘法运算取得原式=•,然后约分得原式=,再把x=﹣2,y=1代入计算即可.【解答】解:原式=•=,当x=﹣2,y=1时,原式==2.20.如图,点A,B,F,C在同一直线上,AB=FC,DF=EB,DF∥BE.(1)试判定AD与CE相等吗?(2)AD与CB的位置关系如何?请说明理由.【考点】全等三角形的判定与性质.【分析】(1)求出AF=CE,证明△ADF≌△CBE,依照全等三角形的性质即可得出结论;(2)由全等三角形的性质得出∠A=∠C,即可得出结论.【解答】解:(1)AD=CB;理由如下:∵AE=CF,∴AE+EF=CF+EF,∴AF=CE,∵DF∥BE,∴∠AFD=∠CEB,在△ADF和△CBE中,,∴△ADF≌△CBE(SAS),∴AD=CB;(2)AD∥CB,理由如下:∵△ADF≌△CBE,∴∠A=∠C,∴AD∥CB.21.甲队单独做一项工程恰好如期完成,乙队单独完成这项工程要比预期多用3天.假设甲、乙两队合作2天,余下的工程由乙队单独做也正好如期完成,那么规定的工期是多少天?【考点】分式方程的应用.【分析】此题的相等关系有两个“乙队单独完成这项工程要比预期多用3天”和“假设甲、乙两队合作2天,余下的工程由乙队单独做也正好如期完成”.考虑到问题要求的是规定的工期,因此依照第二个相等关系来列方程比较直接,因此设规定的工期是x天,那么甲队完成这项工程要x天,再依照第一个相等关系,乙队完成这项工程的天数就能够够表示为(x+3)天.【解答】解:设规定的工期是x天,那么甲队完成这项工程要x天,乙队完成这项工程要(x+3)天.由题意可列方程:.解得:x=6.查验:x=6时,x(x+3)≠0.∴x=6是原方程的解.答:规定的工期是6天.22.如图,在等边三角形ABC中,点D,E别离在边BC,AC上,且DE∥AB,过点E作EF⊥DE,交BC的延长线于点F.(1)求∠F的度数;(2)假设CD=2,求DF的长.【考点】等边三角形的判定与性质;含30度角的直角三角形.【分析】(1)依照平行线的性质可得∠EDC=∠B=60°,依照三角形内角和定理即可求解;(2)易证△EDC是等边三角形,再依照直角三角形的性质即可求解.【解答】解:(1)∵△ABC是等边三角形,∴∠B=60°,∵DE∥AB,∴∠EDC=∠B=60°,∵EF⊥DE,∴∠DEF=90°,∴∠F=90°﹣∠EDC=30°;(2)∵∠ACB=60°,∠EDC=60°,∴△EDC是等边三角形.∴ED=DC=2,∵∠DEF=90°,∠F=30°,∴DF=2DE=4.23.在△ABC中,AB边的垂直平分线l1交BC于D,AC边的垂直平分线l2交BC于E,l1与l2相交于点O.△ADE的周长为6cm.(1)求BC的长;(2)别离连结OA、OB、OC,假设△OBC的周长为16cm,求OA的长.【考点】线段垂直平分线的性质.【分析】(1)先依照线段垂直平分线的性质得出AD=BD,AE=CE,再依照AD+DE+AE=BD+DE+CE即可得出结论;(2)先依照线段垂直平分线的性质得出OA=OC=OB,再由∵△OBC的周长为16cm 求出OC的长,进而得出结论.【解答】解:(1)∵DF、EG别离是线段AB、AC的垂直平分线,∴AD=BD,AE=CE,∴AD+DE+AE=BD+DE+CE=BC,∵△ADE的周长为6cm,即AD+DE+AE=6cm,∴BC=6cm;(2)∵AB边的垂直平分线l1交BC于D,AC边的垂直平分线l2交BC于E,∴OA=OC=OB,∵△OBC的周长为16cm,即OC+OB+BC=16,∴OC+OB=16﹣6=10,∴OC=5,∴OA=OC=OB=5.24.如图,点O是等边△ABC内一点.将△BOC绕点C按顺时针方向旋转60°得△ADC,连接OD.已知∠AOB=110°.(1)求证:△COD是等边三角形;(2)当α=150°时,试判定△AOD的形状,并说明理由;(3)探讨:当α为多少度时,△AOD是等腰三角形.【考点】等边三角形的判定;全等三角形的判定与性质;等腰三角形的判定;勾股定理的逆定理.【分析】此题有必然的开放性,要找到转变中的不变量才能有效解决问题.【解答】(1)证明:∵CO=CD,∠OCD=60°,∴△COD是等边三角形;(2)解:当α=150°,即∠BOC=150°时,△AOD是直角三角形.∵△BOC≌△ADC,∴∠ADC=∠BOC=150°,又∵△COD是等边三角形,∴∠ODC=60°,∴∠ADO=90°,即△AOD是直角三角形;(3)解:①要使AO=AD,需∠AOD=∠ADO.∵∠AOD=360°﹣∠AOB﹣∠COD﹣α=360°﹣110°﹣60°﹣α=190°﹣α,∠ADO=α﹣60°,∴190°﹣α=α﹣60°∴α=125°;②要使OA=OD,需∠OAD=∠ADO.∵∠AOD=190°﹣α,∠ADO=α﹣60°,∴∠OAD=180°﹣(∠AOD+∠ADO)=50°,∴α﹣60°=50°∴α=110°;③要使OD=AD,需∠OAD=∠AOD.∵190°﹣α=50°∴α=140°.综上所述:当α的度数为125°,或110°,或140°时,△AOD是等腰三角形.说明:第(3)小题考生答对1种得,答对2种得.八年级(上)期中数学试卷一、选择题:本大题共10小题,每题2分,共20分,在每题给出的四个选项中,只有一项为哪一项符合题目要求的.1.以下图形中,是轴对称图形的是()A.B.C.D.2.若是三角形的两边长别离为3和5,第三边长是偶数,那么第三边长能够是()A.2 B.3 C.4 D.83.如图,在△ABC中,∠A=50°,∠C=70°,那么外角∠ABD的度数是()A.110°B.120°C.130°D.140°4.一个多边形的外角和是内角和的,那个多边形的边数为()A.5 B.6 C.7 D.85.如图,CE⊥AB,DF⊥AB,垂足别离为E、F,AC∥DB,且AC=BD,那么Rt△AEC ≌Rt△BFD的理由是()A.SSS B.AAS C.SAS D.HL6.如图,以下条件中,不能证明△ABC≌△DCB的是()A.AB=DC,AC=DB B.AB=DC,∠ABC=∠DCBC.BO=CO,∠A=∠D D.AB=DC,∠DBC=∠ACB7.如图,已知在△ABC中,CD是AB边上的高线,BE平分∠ABC,交CD于点E,BC=5,DE=2,那么△BCE的面积等于()A.10 B.7 C.5 D.48.如图,在△ABE中,∠A=105°,AE的垂直平分线MN交BE于点C,且AB+BC=BE,那么∠B的度数是()A.45°B.50°C.55°D.60°9.如图,Rt△ABC中,CD是斜边AB上的高,角平分线AE交CD于H,EF⊥AB 于F,那么以下结论中不正确的选项是()A.∠ACD=∠B B.CH=CE=EF C.AC=AF D.CH=HD10.如图,等边△ABC的边长为4,AD是BC边上的中线,F是AD边上的动点,E是AC边上一点,假设AE=2,当EF+CF取得最小值时,那么∠ECF的度数为()A.15°B.22.5°C.30°D.45°二、填空题:本大题共8小题,每题3分,共24分,把答案写在题中横线上.11.假设点P(a+2,3)与点Q(﹣1,b+1)关于y轴对称,那么a+b= .12.等腰三角形的一个外角是60°,那么它的顶角的度数是.13.如图,在△ABC中,点O是△ABC内一点,且点O到△ABC三边的距离相等,假设∠A=70°,那么∠BOC= .14.如图,平面上两个正方形与正五边形都有一条公共边,那么∠α等于度.15.如图,在△ABC中,已知AD=DE,AB=BE,∠A=85°,∠C=45°,那么∠CDE= .16.已知:如图,△ABC中,BO,CO别离是∠ABC和∠ACB的平分线,过O点的直线别离交AB、AC于点D、E,且DE∥BC.假设AB=6cm,AC=8cm,那么△ADE 的周长为.17.如图,AD⊥BC于点D,D为BC的中点,连接AB,∠ABC的平分线交AD于点O,连结OC,假设∠AOC=125°,那么∠ABC= .18.如图,AC=BC,∠ACB=90°,AE平分∠BAC,BF⊥AE,交AC延长线于F,且垂足为E,那么以下结论:①AD=BF;②BF=AF;③AC+CD=AB,④AB=BF;⑤AD=2BE.其中正确的结论有.(填写序号)三、解答题:本大题共6小题,共56分,解许诺写出文字说明、证明进程或演算步骤.19.已知,求边长为a,b的等腰三角形的周长.20.如图,AD是△ABC的角平分线,CE是△ABC的高,∠BAC=50°,∠BCE=30°,求∠ADB的度数.21.画图与设计:图1网格中的每一个小正方形的边长都是1,图2中的两个长方形的长都是2,宽都是1,将图2中的两个长方形和图1网格中的图形拼成一个新的图形,使拼成的图形成一个轴对称图形.请你在图(1),图(2),图(3)中各画出一种拼法(要求三种拼法各不相同).22.已知:如图,AB∥CD,E是AB的中点,CE=DE.求证:(1)∠AEC=∠BED;(2)AC=BD.23.如图,在等边三角形ABC中,AD⊥BC于点D,以AD为一边向右作等边三角形ADE,DE与AC交于点F.(1)试判定DF与EF的数量关系,并给出理由.(2)假设CF的长为2cm,试求等边三角形ABC的边长.24.如图,△ABC中,∠ACB=90°,AC=BC,D为△ABC内一点,∠CAD=∠CBD=15°,E为AD延长线上的一点,且CE=AC.(1)求∠CDE的度数;(2)假设点M在DE上,且DC=DM,求证:ME=BD.参考答案与试题解析一、选择题:本大题共10小题,每题2分,共20分,在每题给出的四个选项中,只有一项为哪一项符合题目要求的.1.以下图形中,是轴对称图形的是()A.B.C.D.【考点】轴对称图形.【分析】依照轴对称图形的概念求解.【解答】解:A、不是轴对称图形,故错误;B、不是轴对称图形,故错误;C、是轴对称图形,故正确;D、不是轴对称图形,故错误.应选C.2.若是三角形的两边长别离为3和5,第三边长是偶数,那么第三边长能够是()A.2 B.3 C.4 D.8【考点】三角形三边关系.【分析】依照三角形三边关系,可令第三边为X,那么5﹣3<X<5+3,即2<X <8,又因为第三边长为偶数,因此第三边长是4,6.问题可求.【解答】解:由题意,令第三边为X,那么5﹣3<X<5+3,即2<X<8,∵第三边长为偶数,∴第三边长是4或6.∴三角形的第三边长能够为4.应选C.3.如图,在△ABC中,∠A=50°,∠C=70°,那么外角∠ABD的度数是()A.110°B.120°C.130°D.140°【考点】三角形的外角性质.【分析】依照三角形的一个外角等于与它不相邻的两个内角的和列式计算即可得解.【解答】解:由三角形的外角性质的,∠ABD=∠A+∠C=50°+70°=120°.应选B.4.一个多边形的外角和是内角和的,那个多边形的边数为()A.5 B.6 C.7 D.8【考点】多边形内角与外角.【分析】依照多边形的外角和为360°及题意,求出那个多边形的内角和,即可确信出多边形的边数.【解答】解:∵一个多边形的外角和是内角和的,且外角和为360°,∴那个多边形的内角和为900°,即(n﹣2)•180°=900°,解得:n=7,那么那个多边形的边数是7,应选C.5.如图,CE⊥AB,DF⊥AB,垂足别离为E、F,AC∥DB,且AC=BD,那么Rt△AEC ≌Rt△BFD的理由是()A.SSS B.AAS C.SAS D.HL【考点】直角三角形全等的判定.【分析】由平行可得∠A=∠B,再结合已知条件可求得答案.【解答】解:∵AC∥BD,∴∠A=∠B,∵CE⊥AB,DF⊥AB,∴∠AEC=∠DFB,且AC=BD,∴在Rt△AEC和Rt△BFD中,知足AAS,应选B.6.如图,以下条件中,不能证明△ABC≌△DCB的是()A.AB=DC,AC=DB B.AB=DC,∠ABC=∠DCBC.BO=CO,∠A=∠D D.AB=DC,∠DBC=∠ACB【考点】全等三角形的判定.【分析】此题要判定△ABC≌△DCB,已知BC是公共边,具有了一组边对应相等.因此由全等三角形的判定定理作出正确的判定即可.【解答】解:依照题意知,BC边为公共边.A、由“SSS”能够判定△ABC≌△DCB,故本选项错误;B、由“SAS”能够判定△ABC≌△DCB,故本选项错误;C、由BO=CO能够推知∠ACB=∠DBC,那么由“AAS”能够判定△ABC≌△DCB,故本选项错误;D、由“SSA”不能判定△ABC≌△DCB,故本选项正确.应选:D.7.如图,已知在△ABC中,CD是AB边上的高线,BE平分∠ABC,交CD于点E,BC=5,DE=2,那么△BCE的面积等于()A.10 B.7 C.5 D.4【考点】角平分线的性质.【分析】作EF⊥BC于F,依照角平分线的性质求得EF=DE=2,然后依照三角形面积公式求得即可.【解答】解:作EF⊥BC于F,∵BE平分∠ABC,ED⊥AB,EF⊥BC,∴EF=DE=2,=BC•EF=×5×2=5,∴S△BCE应选C.8.如图,在△ABE中,∠A=105°,AE的垂直平分线MN交BE于点C,且AB+BC=BE,那么∠B的度数是()A.45°B.50°C.55°D.60°【考点】线段垂直平分线的性质.【分析】第连续接AC,由AE的垂直平分线MN交BE于点C,可得AC=EC,又由AB+BC=BE,易证得AB=AC,然后由等腰三角形的性质与三角形内角和定理,求得∠BAE=∠BAC+∠CAE=180°﹣4∠E+∠E=105°,继而求得答案.【解答】解:连接AC,∵MN是AE的垂直平分线,∴AC=EC,∴∠CAE=∠E,∵AB+BC=BE,BC+EC=BE,∴AB=EC=AC,∴∠B=∠ACB,∵∠ACB=∠CAE+∠E=2∠E,∴∠B=2∠E,∴∠BAC=180°﹣∠B﹣∠ACB=180°﹣4∠E,∵∠BAE=∠BAC+∠CAE=180°﹣4∠E+∠E=105°,解得:∠E=25°,∴∠B=2∠E=50°.应选B.9.如图,Rt△ABC中,CD是斜边AB上的高,角平分线AE交CD于H,EF⊥AB 于F,那么以下结论中不正确的选项是()A.∠ACD=∠B B.CH=CE=EF C.AC=AF D.CH=HD【考点】角平分线的性质;全等三角形的判定与性质.【分析】依照角的平分线的性质,得CE=EF,两直线平行,内错角相等,得∠AEF=∠CHE,用AAS判定△ACE≌△AEF,由全等三角形的性质,得∠CEH=∠AEF,用等角对等边判定边相等.【解答】解:A、∵∠B和∠ACD都是∠CAB的余角,∴∠ACD=∠B,故正确;B、∵CD⊥AB,EF⊥AB,∴EF∥CD∴∠AEF=∠CHE,∴∠CEH=∠CHE∴CH=CE=EF,故正确;C、∵角平分线AE交CD于H,∴∠CAE=∠BAE,又∵∠ACB=∠AFE=90°,AE=AE,∴△ACE≌△AEF,∴CE=EF,∠CEA=∠AEF,AC=AF,故正确;D、点H不是CD的中点,故错误.应选D.10.如图,等边△ABC的边长为4,AD是BC边上的中线,F是AD边上的动点,E是AC边上一点,假设AE=2,当EF+CF取得最小值时,那么∠ECF的度数为()A.15°B.22.5°C.30°D.45°【考点】轴对称-最短线路问题;等边三角形的性质.【分析】过E作EM∥BC,交AD于N,连接CM交AD于F,连接EF,推出M为AB 中点,求出E和M关于AD对称,依照等边三角形性质求出∠ACM,即可求出答案.【解答】解:过E作EM∥BC,交AD于N,∵AC=4,AE=2,∴EC=2=AE,∴AM=BM=2,∴AM=AE,∵AD是BC边上的中线,△ABC是等边三角形,∴AD⊥BC,∵EM∥BC,∴AD⊥EM,∵AM=AE,∴E和M关于AD对称,连接CM交AD于F,连接EF,那么现在EF+CF的值最小,∵△ABC是等边三角形,∴∠ACB=60°,AC=BC,∵AM=BM,∴∠ECF=∠ACB=30°,应选C.二、填空题:本大题共8小题,每题3分,共24分,把答案写在题中横线上.11.假设点P(a+2,3)与点Q(﹣1,b+1)关于y轴对称,那么a+b= 1 .【考点】关于x轴、y轴对称的点的坐标.【分析】依照“关于y轴对称的点,纵坐标相同,横坐标互为相反数”列方程求出a、b,然后相加计算即可得解.【解答】解:∵点P(a+2,3)与点Q(﹣1,b+1)关于y轴对称,∴a+2=1,b+1=3,解得a=﹣1,b=2,因此a+b=(﹣1)+2=1.故答案为:1.12.等腰三角形的一个外角是60°,那么它的顶角的度数是120°.【考点】等腰三角形的性质.【分析】三角形内角与相邻的外角和为180°,三角形内角和为180°,等腰三角形两底角相等,100°只可能是顶角.【解答】解:等腰三角形一个外角为60°,那相邻的内角为120°,三角形内角和为180°,若是那个内角为底角,内角和将超过180°,因此120°只可能是顶角.故答案为:120°.13.如图,在△ABC中,点O是△ABC内一点,且点O到△ABC三边的距离相等,假设∠A=70°,那么∠BOC= 125°.【考点】角平分线的性质.【分析】求出O为△ABC的三内角平分线的交点,求出∠OBC=∠ABC,∠OCB=∠ACB,依照三角形内角和定理求出∠ABC+∠ACB,求出∠OBC+∠OCB,依照三角形内角和定理求出即可.【解答】解:∵在△ABC中,点O是△ABC内一点,且点O到△ABC三边的距离相等,∴O为△ABC的三内角平分线的交点,∴∠OBC=∠ABC,∠OCB=∠ACB,∵∠A=70°,∴∠ABC+∠ACB=180°﹣∠A=110°,∴∠OBC+∠OCB=55°,∴∠BOC=180°﹣(∠OBC+∠OCB)=125°,故答案为:125°.14.如图,平面上两个正方形与正五边形都有一条公共边,那么∠α等于72 度.【考点】多边形内角与外角.【分析】先别离求出正五边形的一个内角为108°,正方形的每一个内角是90°,再依照圆周角是360度求解即可.【解答】解:正五边形的一个内角为108°,正方形的每一个内角是90°,因此∠α=360°﹣108°﹣90°﹣90°=72°.15.如图,在△ABC中,已知AD=DE,AB=BE,∠A=85°,∠C=45°,那么∠CDE= 40°.【考点】等腰三角形的性质.【分析】依照SSS证△ABD≌△EBD,推出∠A=∠DEB,再依照三角形外角的性质即可求解.【解答】解:在△ABD与△EBD中,∴△ABD≌△EBD,∴∠A=∠DEB=85°,∵∠C=45°,∴∠CDE=85°﹣45°=40°.故答案为:40°.16.已知:如图,△ABC中,BO,CO别离是∠ABC和∠ACB的平分线,过O点的直线别离交AB、AC于点D、E,且DE∥BC.假设AB=6cm,AC=8cm,那么△ADE 的周长为14cm .【考点】等腰三角形的判定与性质;平行线的性质.【分析】两直线平行,内错角相等,和依照角平分线性质,可得△OBD、△EOC 均为等腰三角形,由此把△AEF的周长转化为AC+AB.【解答】解:∵DE∥BC∴∠DOB=∠OBC,又∵BO是∠ABC的角平分线,∴∠DBO=∠OBC,∴∠DBO=∠DOB,∴BD=OD,同理:OE=EC,∴△ADE的周长=AD+OD+OE+AE=AD+BD+AE+EC=AB+AC=14cm.故答案是:14cm.17.如图,AD⊥BC于点D,D为BC的中点,连接AB,∠ABC的平分线交AD于点O,连结OC,假设∠AOC=125°,那么∠ABC= 70°.【考点】线段垂直平分线的性质;角平分线的性质;等腰三角形的性质.【分析】先依照三角形的一个外角等于与它不相邻的两个内角的和列式求出∠C,再依照线段垂直平分线上的点到线段两头点的距离相等可得OB=OC,依照等边对等角的性质求出∠OBC=∠C,然后依照角平分线的概念解答即可.【解答】解:∵AD⊥BC,∠AOC=125°,∴∠C=∠AOC﹣∠ADC=125°﹣90°=35°,∵D为BC的中点,AD⊥BC,∴OB=OC,∴∠OBC=∠C=35°,∵OB平分∠ABC,∴∠ABC=2∠OBC=2×35°=70°.故答案为:70°.18.如图,AC=BC,∠ACB=90°,AE平分∠BAC,BF⊥AE,交AC延长线于F,且垂足为E,那么以下结论:①AD=BF;②BF=AF;③AC+CD=AB,④AB=BF;⑤AD=2BE.其中正确的结论有①③⑤.(填写序号)【考点】角平分线的性质;垂线;三角形内角和定理;全等三角形的判定与性质;等腰三角形的判定与性质.【分析】依照∠ACB=90°,BF⊥AE,得出∠ACB=∠BED=∠BCF=90°,推出∠F=∠ADC,证△BCF≌△ACD,依照全等三角形的性质即可判定①②;假设AC+CD=AB,求出∠F+∠FBC=90°,即可判定③④,证依照全等三角形的判定ASA得出△BEA ≌△FEA,推出BE=EF,即可判定⑤.【解答】解:∵∠ACB=90°,BF⊥AE,∴∠ACB=∠BED=∠BCF=90°,∴∠F+∠FBC=90°,∠BDE+∠FBC=90°,∴∠F=∠BDE,∵∠BDE=∠ADC,。

2017级高一上学期期中考试试题

2017级高一上学期期中考试试题

2017级高一上学期期中考试试题第Ⅰ卷(共100分)第一部分:听力 (共两节,满分30分)第一节听下面5段对话。

每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1. Why is the girl in the classroom?A.To take a class. B. To see Mrs. Miller. C. To get her text books.2. What time does the woman get off work?A. Before 6:30 p.m.B. At 7:00 p.m.C. After 7:00 p.m.3. What do we know about the woman’s sister?A. She is older than the womanB. She is four years old.C. She is in high school.4. What does Ted need to do?A. Clean the living room.B. Wash the dishes.C. Take the tr ash out.5. Why does the girl come to school in an old car?A. The old can works well.B. She can’t afford a new car.C. The new car is being used by her father.第二节听下面5段对话或独白。

每段对话或独白后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

听每段对话或独白前,你将有时间阅读各个小题,每小题5秒钟; 听完后,各小题将给出5秒钟的作答时间。

四年级尖子班暑假期中学习能力测试卷学生版

四年级尖子班暑假期中学习能力测试卷学生版

绝密★启用前思考乐教育2017年暑假学习能力测试卷小学四年级数学(B 版)注意事项:1.答题前填写好自己的姓名等信息 2.请认真答题,书写工整。

第I 卷(选择题)一、选择题(10分)1.等差数列2、5、8、11、14……,第20个数是()A. 20B.59C.62D.562.观察等差数列:2,4,6,8,10,12,14,……,38,40.这个数列的项数是() A.20 B.10 C.30 D.403.观察等差数列:3,6,9,12,15,18,……,36,39……这个数列的公差是() A.3 B.6 C.9 D. 14.已知等差数列1,6,11,16,21,……,它的第17项是( ) A.76 B.81 C.86 D.915.25×36与下列哪个算式的结果不相等()A. 25×4×9B.25×30×6C.25×(30+6)D.25×6×6第II 卷(非选择题)二、计算题1. 口算下列各题。

(4分)336÷6= 210÷7= 320÷8= 810÷9= 250÷5= 630÷9= 450÷5=0÷8=2. 简便计算下列各题。

(50分)(1)25×7×4×9 (2)125×7×8(3)62×99 (4)35×101(5)4×9×25 (6)12×8×125(7)125×21+125×19 (8)25×131-25×28(9)350÷5÷2 (10)600÷25÷4三、解决问题1. 乐乐早晨起来要完成以下几件事情:洗水壶2分钟,烧开水10分钟,把水灌入水瓶要2分钟,吃早点要8分钟,整理书包2分钟,应该怎样安排时间最少?最少要几分钟?(9分)2. 贴烧饼的时候,第一面需要烘2分钟,第二面需要烘2分钟,而贴烧饼的架子上一次最多只能放2个烧饼.要贴5个烧饼至少需要几分钟?(9分)3. 已知等差数列6,11,16,21,26……,求这个数列的第30项是什么?(9分)4. 甲、乙、丙、丁四人各有一块麦地,他们同时用一台收割机进行收割,甲的麦地需要收割5小时,乙的麦地需要收割2小时,丙的麦地需要收割4小时,丁的麦地需要收割1小时.怎样安排四人的顺序,他们花的总时间(包括所有人的等候时间)最少?最少时间是多少?(9分)。

2017期中考试试卷数学

2017期中考试试卷数学

2017期中考试试卷数学一、选择题(每题3分,共30分)1. 下列哪个选项是正确的?A. 1+1=2B. 2+2=5C. 3+3=6D. 4+4=82. 以下哪个表达式表示的是偶数?A. 2n+1B. 2nC. 2n-1D. 3n+23. 圆的面积公式是什么?A. πr^2B. 2πrC. πrD. πr^34. 以下哪个是二次方程的解?A. x^2 + 2x + 1 = 0B. x^2 - 2x + 1 = 0C. x^2 + 2x - 1 = 0D. x^2 - 2x - 1 = 05. 以下哪个选项是正确的?A. √4 = 2B. √9 = 3C. √16 = 5D. √25 = 66. 以下哪个函数是奇函数?A. f(x) = x^2B. f(x) = x^3C. f(x) = x^4D. f(x) = x^57. 以下哪个选项是正确的?A. sin(30°) = 1/2B. sin(45°) = √2/2C. sin(60°) = √3/2D. sin(90°) = √28. 以下哪个选项是正确的?A. c os(30°) = √3/2B. cos(45°) = 1/2C. cos(60°) = √2/2D. cos(90°) = 19. 以下哪个选项是正确的?A. tan(30°) = √3B. tan(45°) = 1C. tan(60°) = √2D. tan(90°) = 010. 以下哪个选项是正确的?A. log2(8) = 3B. log2(16) = 4C. log2(32) = 5D. log2(64) = 6二、填空题(每题3分,共15分)11. 计算 (3x+2)(3x-2) 的结果为 _______。

12. 计算√(9+16) 的结果为 _______。

2017年重点中学九年级上学期期中数学试卷两套汇编一附答案解析

2017年重点中学九年级上学期期中数学试卷两套汇编一附答案解析

2017年重点中学九年级上学期期中数学试卷两套汇编一附答案解析中学九年级(上)期中数学试卷一、选择题(共14小题,每题3分,总分值42分)1.以下函数关系式中,是二次函数的是()A.y=x3﹣2x2﹣1 B.y=x2C.D.y=x+12.抛物线y=(x﹣2)2+3的对称轴是()A.直线x=﹣2 B.直线x=2 C.直线x=﹣3 D.直线x=33.二次函数y=(x﹣1)2+2的最小值是()A.﹣2 B.﹣1 C.1 D.24.已知二次函数y=ax2+bx+c的图象如下图,那么a、b、c知足()A.a<0,b<0,c>0 B.a<0,b<0,c<0 C.a<0,b>0,c>0 D.a>0,b<0,c>05.二次函数y=﹣(x+3)2+2图象的开口方向、对称轴和极点坐标别离为()A.向下,x=3,(3,2) B.向下,x=﹣3,(3,2)C.向上,x=﹣3,(3,2)D.向下,x=﹣3,(﹣3,2)6.抛物线y=x2+2x﹣2的图象的极点坐标是()A.(2,﹣2)B.(1,﹣2)C.(1,﹣3)D.(﹣1,﹣3)7.与抛物线y=2(x﹣1)2+2形状相同的抛物线是()A.B.y=2x2C.y=(x﹣1)2+2 D.y=(2x﹣1)2+2 8.把抛物线y=﹣x2向左平移1个单位,然后向上平移3个单位,那么平移后抛物线的解析式为()A.y=﹣(x﹣1)2﹣3 B.y=﹣(x+1)2﹣3 C.y=﹣(x﹣1)2+3 D.y=﹣(x+1)2+39.把方程x(x+2)=5(x﹣2)化成一样式,那么a、b、c的值别离是()A.1,﹣3,10 B.1,7,﹣10 C.1,﹣5,12 D.1,3,2 10.一元二次方程x2﹣2x+2=0的根的情形是()A.有两个不相等的正根B.有两个不相等的负根C.没有实数根 D.有两个相等的实数根11.某城市2021年末已有绿化面积300公顷,通过两年绿化,绿化面积逐年增加,到2021年末增加到363公顷,设绿化面积平均每一年的增加率为x,由题意,所列方程正确的选项是()A.300(1+x)=363 B.300(1+x)2=363 C.300(1+2x)=363 D.363(1﹣x)2=30012.要使方程(a﹣3)x2+(b+1)x+c=0是关于x的一元二次方程,那么()A.a≠0 B.a≠3C.a≠1且b≠﹣1 D.a≠3且b≠﹣1且c≠013.从一块正方形的木板上锯掉2m宽的长方形木条,剩下的面积是48m2,那么原先这块木板的面积是()A.100m2 B.64m2C.121m2 D.144m214.抛物线y=﹣(x+2)2与y轴交点坐标为()A.(0,2)B.(0,﹣2)C.(﹣2,0)D.(2,0)二.填空题15.把方程3x(x﹣1)=(x+2)(x﹣2)+9化成ax2+bx+c=0的形式为.16.函数y=9﹣4x2,当x= 时有最大值.17.二次函数y=x2的图象开口方向.当x= 时,y有最值,是,当x<0时,y随x的增大而.18.二次函数y=x2﹣2x﹣3的图象与x轴交点的坐标是,y轴的交点坐标是,极点坐标是.三、解答题(共62分)19.(15分)用适当的方式解以下方程:(1)2x2﹣8x=0.(2)x2﹣3x﹣4=0.求出抛物线的开口方向、对称轴、极点坐标.(3)y=x2﹣x+3(公式法).20.(8分)已知关于x的一元二次方程x2﹣(k+1)x﹣6=0的一个根为2,求k的值及另一个根.21.(8分)用总长为60m的篱笆围成矩形场地,矩形面积S随矩形一边l的转变而转变,当l是多少时,场地的面积S最大?22.(9分)青山村种的水稻2001年平均每公顷产7200kg,2003年平均每公顷产8450kg,求水稻每公顷产量的年平均增加率.23.(10分)已知一抛物线与x轴的交点是A(﹣2,0)、B(1,0),且通过点C(2,8).(1)求该抛物线的解析式;(2)求该抛物线的极点坐标.24.(12分)已知二次函数y=2x2﹣4x﹣6.(1)写出抛物线的开口方向,对称轴和极点坐标.(2)在平面直角坐标系中,画出那个二次函数的图象;(3)当x取何值时,y随x的增大而减少?(4)求函数图象与两坐标轴交点所围成的三角形的面积.参考答案与试题解析一、选择题(共14小题,每题3分,总分值42分)1.以下函数关系式中,是二次函数的是()A.y=x3﹣2x2﹣1 B.y=x2C.D.y=x+1【考点】二次函数的概念.【分析】依照二次函数的概念条件对四个选项进行一一分析即可.【解答】解:A、自变量的最高次数是3,错误;B、正确;属于二次函数的一样形式;C、原函数可化为:y=2x﹣2﹣3,自变量的最高次数是﹣2,错误;D、自变量的最高次数是1,错误.应选B.【点评】此题考查二次函数的概念.2.抛物线y=(x﹣2)2+3的对称轴是()A.直线x=﹣2 B.直线x=2 C.直线x=﹣3 D.直线x=3【考点】二次函数的性质.【分析】直接依照极点式的特点可直接写出对称轴.【解答】解:因为抛物线解析式y=(x﹣2)2+3是极点式,极点坐标为(2,3),因此对称轴为直线x=2.应选B.【点评】要紧考查了求抛物线的对称轴的方式.3.二次函数y=(x﹣1)2+2的最小值是()A.﹣2 B.﹣1 C.1 D.2【考点】二次函数的最值.【分析】依照二次函数的性质求解.【解答】解:∵y=(x﹣1)2+2,∴当x=1时,函数有最小值2.应选D.【点评】此题考查了二次函数的最值:当a>0时,抛物线在对称轴左侧,y随x的增大而减少;在对称轴右边,y随x的增大而增大,因为图象有最低点,因此函数有最小值,当x=﹣,函数最小值y=;当a<0时,抛物线在对称轴左侧,y随x的增大而增大;在对称轴右边,y随x的增大而减少,因为图象有最高点,因此函数有最大值,当x=﹣,函数最大值y=.4.已知二次函数y=ax2+bx+c的图象如下图,那么a、b、c知足()A.a<0,b<0,c>0 B.a<0,b<0,c<0 C.a<0,b>0,c>0 D.a>0,b<0,c>0【考点】二次函数图象与系数的关系.【分析】由于开口向下能够判定a<0,由与y轴交于正半轴取得c>0,又由于对称轴x=﹣<0,能够取得b<0,因此能够找到结果.【解答】解:依照二次函数图象的性质,∵开口向下,∴a<0,∵与y轴交于正半轴,∴c>0,又∵对称轴x=﹣<0,∴b<0,因此A正确.应选A.【点评】考查二次函数y=ax2+bx+c系数符号的确信.5.二次函数y=﹣(x+3)2+2图象的开口方向、对称轴和极点坐标别离为()A.向下,x=3,(3,2)B.向下,x=﹣3,(3,2)C.向上,x=﹣3,(3,2)D.向下,x=﹣3,(﹣3,2)【考点】二次函数的性质.【分析】已知抛物线解析式为极点式,依照二次项系数可判定开口方向,依照解析式可知极点坐标及对称轴.【解答】解:由二次函数y=﹣(x+3)2+2,可知a=﹣1<0,故抛物线开口向下;极点坐标为(﹣3,2),对称轴为x=﹣3.应选D.【点评】极点式可判定抛物线的开口方向,对称轴,极点坐标,最大(小)值,函数的增减性.6.抛物线y=x2+2x﹣2的图象的极点坐标是()A.(2,﹣2) B.(1,﹣2) C.(1,﹣3) D.(﹣1,﹣3)【考点】二次函数的性质.【分析】把抛物线解析式化为极点式可求得答案.【解答】解:∵y=x2+2x﹣2=(x+1)2﹣3,∴抛物线极点坐标为(﹣1,﹣3),应选D.【点评】此题要紧考查二次函数的性质,把握二次函数的极点式是解题的关键,即在y=a(x﹣h)2+k中,极点坐标为(h,k),对称轴为x=h.7.与抛物线y=2(x﹣1)2+2形状相同的抛物线是()A.B.y=2x2C.y=(x﹣1)2+2 D.y=(2x﹣1)2+2【考点】二次函数的图象.【分析】当二次项系数相同时,抛物线的形状相同.【解答】解:∵抛物线y=2(x﹣1)2+2中,a=2,∴与已知抛物线形状相同的是抛物线y=2x2.应选B.【点评】二次项系数决定了抛物线的开口方向和开口大小.8.把抛物线y=﹣x2向左平移1个单位,然后向上平移3个单位,那么平移后抛物线的解析式为()A.y=﹣(x﹣1)2﹣3 B.y=﹣(x+1)2﹣3 C.y=﹣(x﹣1)2+3 D.y=﹣(x+1)2+3【考点】二次函数图象与几何变换.【分析】利用二次函数平移的性质.【解答】解:当y=﹣x2向左平移1个单位时,极点由原先的(0,0)变成(﹣1,0),当向上平移3个单位时,极点变成(﹣1,3),那么平移后抛物线的解析式为y=﹣(x+1)2+3.应选:D.【点评】此题要紧考查二次函数y=ax2、y=a(x﹣h)2、y=a(x﹣h)2+k的关系问题.9.把方程x(x+2)=5(x﹣2)化成一样式,那么a、b、c的值别离是()A.1,﹣3,10 B.1,7,﹣10 C.1,﹣5,12 D.1,3,2【考点】一元二次方程的一样形式.【分析】a、b、c别离指的是一元二次方程的一样式中的二次项系数、一次项系数、常数项.【解答】解:由方程x(x+2)=5(x﹣2),得x2﹣3x+10=0,∴a、b、c的值别离是1、﹣3、10;应选A.【点评】此题考查了一元二次方程的一样形式.一元二次方程的一样形式是:ax2+bx+c=0(a,b,c是常数且a≠0),在一样形式中ax2叫二次项,bx叫一次项,c是常数项.其中a,b,c别离叫二次项系数,一次项系数,常数项.10.一元二次方程x2﹣2x+2=0的根的情形是()A.有两个不相等的正根B.有两个不相等的负根C.没有实数根 D.有两个相等的实数根【考点】根的判别式.【分析】依照根的判别式△=b2﹣4ac的符号来判定一元二次方程x2﹣2x+2=0的根的情形.【解答】解:∵一元二次方程x2﹣2x+2=0的二次项系数a=1,一次项系数b=﹣2,常数项c=2,∴△=b2﹣4ac=4﹣8=﹣4<0,∴一元二次方程x2﹣2x+2=0没有实数根;应选C.【点评】此题考查了一元二次方程ax2+bx+c=0(a≠0,a,b,c为常数)的根的判别式△=b2﹣4ac.当△>0,方程有两个不相等的实数根;当△=0,方程有两个相等的实数根;当△<0,方程没有实数根.11.某城市2021年末已有绿化面积300公顷,通过两年绿化,绿化面积逐年增加,到2021年末增加到363公顷,设绿化面积平均每一年的增加率为x,由题意,所列方程正确的选项是()A.300(1+x)=363 B.300(1+x)2=363 C.300(1+2x)=363 D.363(1﹣x)2=300【考点】由实际问题抽象出一元二次方程.【分析】一样用增加后的量=增加前的量×(1+增加率),若是设绿化面积平均每一年的增加率为x,依照题意即可列出方程.【解答】解:设绿化面积平均每一年的增加率为x,依照题意即可列出方程300(1+x)2=363.应选B.【点评】此题为增加率问题,一样形式为a(1+x)2=b,a为起始时刻的有关数量,b为终止时刻的有关数量.12.要使方程(a﹣3)x2+(b+1)x+c=0是关于x的一元二次方程,那么()A.a≠0 B.a≠3C.a≠1且b≠﹣1 D.a≠3且b≠﹣1且c≠0【考点】一元二次方程的概念.【分析】此题依照一元二次方程的概念求解,一元二次方程必需知足两个条件:(1)未知数的最高次数是2;(2)二次项系数不为0.【解答】解:依照一元二次方程的概念中二次项系数不为0得,a﹣3≠0,a≠3.应选B.【点评】一元二次方程的一样形式是:ax2+bx+c=0(a,b,c是常数且a≠0)专门要注意a≠0的条件.当a=0时,上面的方程就不是一元二次方程了,当b=0或c=0时,上面的方程在a≠0的条件下,仍是一元二次方程,只只是是不完全的一元二次方程.13.从一块正方形的木板上锯掉2m宽的长方形木条,剩下的面积是48m2,那么原先这块木板的面积是()A.100m2B.64m2C.121m2D.144m2【考点】一元二次方程的应用.【分析】从一块正方形木板上锯掉2m宽的长方形木条,剩下的仍然是一个长方形,现在那个长方形的长等于原先正方形木板的边长,宽等于正方形木板的边长减去2m,依照剩下的长方形的面积是48m2,列出方程,求出解,进而求出原先正方形木板的面积.【解答】解:设原先正方形木板的边长为xm.由题意,可知x(x﹣2)=48,解得x1=8,x2=﹣6(不合题意,舍去).因此8×8=64.应选B.【点评】此题考查了一元二次方程的应用,明白得从一块正方形木板上锯掉2m 宽的长方形木条,剩下的仍然是一个长方形,是解此题的关键.14.抛物线y=﹣(x+2)2与y轴交点坐标为()A.(0,2)B.(0,﹣2) C.(﹣2,0) D.(2,0)【考点】二次函数图象上点的坐标特点.【分析】求抛物线y=﹣(x+2)2与y轴交点坐标,只需把 x=0代入解析式取得y的值即可求解.【解答】解:∵抛物线y=﹣(x+2)2与y轴交点,∴把x=0代入解析式中的y=﹣2,∴抛物线y=﹣(x+2)2与y轴交点坐标为:(0,﹣2),应选:B.【点评】此题考查了二次函数图象上点的坐标特点,依照y轴上点的横坐标为0求出交点的纵坐标是解题的关键.二.填空题15.把方程3x(x﹣1)=(x+2)(x﹣2)+9化成ax2+bx+c=0的形式为2x2﹣3x﹣5=0 .【考点】一元二次方程的一样形式.【分析】方程整理为一样形式即可.【解答】解:方程整理得:3x2﹣3x=x2﹣4+9,即2x2﹣3x﹣5=0.故答案为:2x2﹣3x﹣5=0.【点评】此题考查了一元二次方程的一样形式,一元二次方程的一样形式是:ax2+bx+c=0(a,b,c是常数且a≠0)专门要注意a≠0的条件.这是在做题进程中容易轻忽的知识点.在一样形式中ax2叫二次项,bx叫一次项,c是常数项.其中a,b,c别离叫二次项系数,一次项系数,常数项.16.函数y=9﹣4x2,当x= 0 时有最大值9 .【考点】二次函数的最值.【分析】此题考查利用二次函数极点式求最大(小)值的方式.【解答】解:由于﹣4<0,因此函数y=9﹣4x2有最大值,当x=0时有最大值9.【点评】求二次函数的最大(小)值有三种方式,第一种可由图象直接得出,第二种是配方式,第三种是公式法.17.二次函数y=x2的图象开口方向向上.当x= 0 时,y有最小值,是0 ,当x<0时,y随x的增大而减小.【考点】二次函数的性质.【分析】二次函数y=ax2+bx+c (a,b,c为常数,a≠0)且a决定函数的开口方向,a>0时,开口方向向上,a<0时,开口方向向下.在极点处,y具有最大或最小值,在对称轴的双侧,y随x的转变相反.【解答】解:二次函数y=x2的图象开口方向向上,当x=0时,y有最小值,是0,当x<0时,y随x的增大而减小.【点评】此题要紧考查二次函数图象的性质.18.二次函数y=x2﹣2x﹣3的图象与x轴交点的坐标是(﹣1,0),(3,0),y轴的交点坐标是(0,﹣3),极点坐标是(1,﹣4).【考点】二次函数图象上点的坐标特点.【分析】求函数与x轴交点,令y=0,代入求解即可,同理求与y轴交点坐标,可令x=0,代入解析式求解即可,把二次函数化为极点坐标形式可求得极点坐标.【解答】解:依照题意,令y=0,代入函数解析式得,x2﹣2x﹣3=0,解得x1=3,x2=﹣1,∴与x轴交点坐标为(﹣1,0),(3,0),同理令x=0,代入解析式得,y=﹣3,∴与y轴交点为(0,﹣3),把二次函数解析式化为极点坐标形式得,y=x2﹣2x﹣3=(x﹣1)2﹣4,∴极点坐标为(1,﹣4).【点评】此题考查了二次函数图象上点的坐标特点,是基础题.三、解答题(共62分)19.(15分)(2016秋•海南期中)用适当的方式解以下方程:(1)2x2﹣8x=0.(2)x2﹣3x﹣4=0.求出抛物线的开口方向、对称轴、极点坐标.(3)y=x2﹣x+3(公式法).【考点】二次函数的性质;解一元二次方程-因式分解法.【分析】(1)利用因式分解法求解即可;(2)利用因式分解法求解即可;(3)利用极点坐标公式求解.【解答】解:(1)原方程可化为x2﹣4x=0,因式分解可得x(x﹣4)=0,∴x=0或x﹣4=0,∴x1=0,x2=4;(2)因式分解可得(x﹣4)(x+1)=0,∴x﹣4=0或x+1=0,∴x1=4,x2=﹣1;(3)在y=x2﹣x+3中,∵a=>0,∴抛物线开口向上,∵﹣=﹣=1, ==,∴抛物线对称轴为x=1,极点坐标为(1,).【点评】此题要紧考查一元二次方程的解法及二次函数的性质,把握因式分解的方式及二次函数的极点式是解题的关键.20.已知关于x的一元二次方程x2﹣(k+1)x﹣6=0的一个根为2,求k的值及另一个根.【考点】一元二次方程的解.【分析】由于一根为2,把x=2代入方程即可求得k的值.然后依照两根之积即可求得另一根.【解答】解:∵方程x2﹣(k+1)x﹣6=0的一个根为2,∴22﹣2(k+1)﹣6=0,解得k=﹣2,设另一根为x,∵2x=﹣6,∴x=﹣3,∴k=﹣2,另一根为﹣3.【点评】考查了一元二次方程的解的知识,解题时可利用根与系数的关系使问题简化,难度不大.21.用总长为60m的篱笆围成矩形场地,矩形面积S随矩形一边l的转变而转变,当l是多少时,场地的面积S最大?【考点】二次函数的应用.【分析】依照矩形面积公式,需要确信矩形的长,宽别离是l、(30﹣l),由矩形面积公式列函数关系式,由二次函数的极点坐标公式可求面积最大值.【解答】解:由S=l(30﹣l)=﹣l2+30 l.(0<l<30)当l=时,S有最大值.即当l=15m时,场地的面积最大.【点评】此题考查点了矩形面积的求法及二次函数的实际应用.此题为数学建模题,借助二次函数解决实际问题.22.青山村种的水稻2001年平均每公顷产7200kg,2003年平均每公顷产8450kg,求水稻每公顷产量的年平均增加率.【考点】一元二次方程的应用.【分析】此题依据题中的等量关系水稻2001年平均每公顷产7200kg,2003年平均每公顷产8450kg,依照增加后的产量=增加前的产量(1+增加率),设增加率是x,那么2003年的产量是7200(1+x)2据此即可列方程,解出后查验即可.【解答】解:设水稻每公顷产量的年平均增加率为x,那么有:7200(1+x)2=8450,解得:x1=≈0.0833,x2=﹣=﹣2.0833(应舍去).∴水稻每公顷产量的年平均增加率为8.33%.【点评】假设原先的数量为a,平均每次增加或降低的百分率为x,通过第一次调整,就调整到a×(1±x),再通过第二次调整确实是a×(1±x)(1±x)=a(1±x)2.增加用“+”,下降用“﹣”.23.(10分)(2007•天津)已知一抛物线与x轴的交点是A(﹣2,0)、B(1,0),且通过点C(2,8).(1)求该抛物线的解析式;(2)求该抛物线的极点坐标.【考点】待定系数法求二次函数解析式;二次函数的性质.【分析】此题考查了待定系数法求a、b、c的值,依照题意可得三元一次方程组,解方程组即可求得待定系数的值;利用配方式或公式法求极点坐标即可.【解答】解:(1)设那个抛物线的解析式为y=ax2+bx+c;由已知,抛物线过A(﹣2,0),B(1,0),C(2,8)三点,得;解那个方程组,得a=2,b=2,c=﹣4;∴所求抛物线的解析式为y=2x2+2x﹣4.(2)y=2x2+2x﹣4=2(x2+x﹣2)=2(x+)2﹣,∴该抛物线的极点坐标为(﹣,﹣).【点评】此题考查了用待定系数法求函数解析式的方式,方程组的解法,同时还考查了抛物线极点坐标的求法.24.(12分)(2016秋•海南期中)已知二次函数y=2x2﹣4x﹣6.(1)写出抛物线的开口方向,对称轴和极点坐标.(2)在平面直角坐标系中,画出那个二次函数的图象;(3)当x取何值时,y随x的增大而减少?(4)求函数图象与两坐标轴交点所围成的三角形的面积.【考点】抛物线与x轴的交点.【分析】(1)依照二次项系数大于0判定出开口向上,将二次函数解析式整理成极点式形式,然后写成对称轴和极点坐标即可;(2)求出二次函数与坐标轴的交点,然后作出函数图象即可;(3)依照函数图象与二次函数的增减性解答;(4)利用三角形的面积公式列式计算即可得解.【解答】解:(1)∵a=2>0,∴抛物线的开口向上,∵y=2x2﹣4x﹣6=2(x﹣1)2﹣8,∴抛物线对称轴为直线x=1,极点坐标为(1,﹣8);(2)令y=0,2x2﹣4x﹣6=0,解得x1=﹣1,x2=3,因此,抛物线与x轴的交点坐标为(﹣1,0),(3,0),令x=0,那么y=﹣6,因此,抛物线与y轴的交点坐标为(0,﹣6),作出函数图象如下图;(3)x<1时,y随x的增大而减少;(4)函数图象与x轴的交点设为A、B,那么AB=3﹣(﹣1)=3+1=4,设与y轴的交点坐标为(0,﹣6),那么OC=6,因此,函数图象与两坐标轴交点所围成的三角形的面积=AB•OC=×4×6=12.【点评】此题考查了抛物线与x轴的交点问题,要紧利用了二次函数的性质,二次函数图象的作法,将抛物线解析式整理成极点式形式求解更简便.九年级(上)期中数学试卷(解析版)一、选择题1.以下命题正确的选项是()A.一组对边平行,另一组对边相等的四边形是平行四边形B.对角线相互垂直的四边形是菱形C.对角线相等的四边形是矩形D.一组邻边相等的矩形是正方形2.已知菱形的边长和一条对角线的长均为2cm,那么菱形的面积为()A.3cm2B.4cm2C. cm2D.2cm23.以下方程中,关于x的一元二次方程是()A.(x+1)2=2(x+1)B. +﹣5=0 C.ax2+bx+c=0 D.x2+2x=x2﹣1 4.关于x的一元二次方程x2﹣k=0有实数根,那么()A.k<0 B.k>0 C.k≥0 D.k≤05.以下条件不能判定△ABC与△DEF相似的是()A.B.,∠A=∠DC.∠A=∠D,∠B=∠E D.,∠B=∠E6.一个用于防震的L形包装塑料泡沫如下图,那么该物体的俯视图是()A.B.C.D.7.在反比例函数y=的图象的每一条曲线上,y都随x的增大而增大,那么k的值能够是()A.﹣1 B.0 C.1 D.28.有一个正方体,6个面上别离标有1~6这6个整数,抛掷那个正方体一次,那么显现向上一面的数字为偶数的概率是()A.B.C.D.二、填空题9.如图,菱形ABCD的两条对角线相交于O,假设AC=6,BD=4,那么菱形ABCD 的周长是.10.已知方程x2﹣3x+m=0的一个根是1,那么m的值是,它的另一个根是.11.方程x2﹣16=0的解为.12.如图,路灯距离地面8米,身高1.6米的小明站在距离灯的底部(点O)20米的A处,那么小明的影子AM长为米.13.如图:使△AOB∽△COD,那么还需添加一个条件是:.(写一个即可)14.写一个反比例函数的解析式,使它的图象在第一、三象限:.三、计算题(15题按要求方式解答,16题用适当方式解答)15.(12分)解方程:(1)x2+4x+1=0(用配方式);(2)x(x﹣2)+x﹣2=0.16.(12分)解方程(1)4x2﹣169=0(2)x2﹣4x+2=0.四、解答题:17.(7分)如图,矩形ABCD中,点E,F别离在AB,CD边上,连接CE、AF,∠DCE=∠BAF.试判定四边形AECF的形状并加以证明.18.(8分)如图,在△ABC中,AD是角平分钱,点E在AC上,且∠EAD=∠ADE.(1)求证:△DCE∽△BCA;(2)假设AB=3,AC=4.求DE的长.19.(6分)画出下面实物的三视图:20.(8分)如图,是小亮晚上在广场散步的示用意,图中线段AB表示站立在广场上的小亮,线段PO表示直立在广场上的灯杆,点P表示照明灯的位置.(1)在小亮由B处沿BO所在的方向行走抵达O处的进程中,他在地面上的影子长度的转变情形为;(2)请你在图中画出小亮站在AB处的影子;(3)当小亮离开灯杆的距离OB=4.2m时,身高(AB)为1.6m的小亮的影长为1.6m,问当小亮离开灯杆的距离OD=6m时,小亮的影长是多少m?21.(8分)某水果批发商场经销一种高级水果,若是每千克盈利10元,天天可售出500千克.经市场调查发觉,在进货价不变的情形下,假设每千克涨价1元,日销售量将减少20千克.现该商场要保证天天盈利6000元,同时又要使顾客取得实惠,那么每千克应涨价多少元?22.(8分)如图,甲、乙两人在玩转盘游戏时,预备了两个能够自由转动的转盘A,B,每一个转盘被分成面积相等的几个扇形,并在每一个扇形内标上数字.游戏规那么:同时转动两个转盘,当转盘停止后,指针所指区域的数字之和为0时,甲获胜;数字之和为1时,乙获胜.若是指针恰好指在分割线上,那么重转一次,直到指针指向某一区域为止.(1)用画树状图或列表法求乙获胜的概率;(2)那个游戏规那么对甲、乙两边公平吗?请判定并说明理由.23.(9分)如图,一次函数y=ax+b的图象与反比例函数y=的图象交于M、N 两点.(1)求反比例函数与一次函数的解析式;(2)依照图象写出使反比例函数的值大于一次函数的值的x的取值范围.参考答案与试题解析一、选择题1.以下命题正确的选项是()A.一组对边平行,另一组对边相等的四边形是平行四边形B.对角线相互垂直的四边形是菱形C.对角线相等的四边形是矩形D.一组邻边相等的矩形是正方形【考点】命题与定理;平行四边形的判定;菱形的判定;矩形的判定;正方形的判定.【分析】分析是不是为真命题,需要别离分析各题设是不是能推出结论,从而利用排除法得出答案.【解答】解:A、一组对边平行,另一组对边相等的四边形有可能是等腰梯形,故A选项错误;B、对角线相互垂直的四边形也可能是一样四边形,故B选项错误;C、对角线相等的四边形有可能是等腰梯形,故C选项错误.D、一组邻边相等的矩形是正方形,故D选项正确.应选:D.【点评】此题考查特殊平行四边形的判定,需熟练把握各特殊四边形的特点.2.已知菱形的边长和一条对角线的长均为2cm,那么菱形的面积为()A.3cm2B.4cm2C. cm2D.2cm2【考点】菱形的性质.【分析】依照菱形的性质可得该对角线与菱形的边长组成一个等边三角形,利用勾股定理求得另一条对角线的长,再依照菱形的面积公式:菱形的面积=×两条对角线的乘积,即可求得菱形的面积.【解答】解:由已知可得,这条对角线与边长组成了等边三角形,可求得另一对角线长2,那么菱形的面积=2×2÷2=2cm2应选D.【点评】此题要紧考查菱形的面积等于两条对角线的积的一半.3.以下方程中,关于x的一元二次方程是()A.(x+1)2=2(x+1)B. +﹣5=0 C.ax2+bx+c=0 D.x2+2x=x2﹣1【考点】一元二次方程的概念.【分析】利用一元二次方程的概念判定即可.【解答】解:一元二次方程是指ax2+bx+c=0(a≠0),B选项含有分式,不符合条件;C选项没有说明a≠0;D选项经化简后不含二次项,应选A【点评】此题考查了一元二次方程的概念,熟练把握一元二次方程的概念是解此题的关键.4.关于x的一元二次方程x2﹣k=0有实数根,那么()A.k<0 B.k>0 C.k≥0 D.k≤0【考点】解一元二次方程-直接开平方式.【分析】依照直接开平方式的步骤得出x2=k,再依照非负数的性质得出k≥0即可.【解答】解:∵x2﹣k=0,∴x2=k,∴一元二次方程x2﹣k=0有实数根,那么k≥0,应选:C.【点评】此题考查了直接开平方式解一元二次方程,用直接开方式求一元二次方程的解的类型有:x2=a(a≥0);ax2=b(a,b同号且a≠0);(x+a)2=b(b ≥0);a(x+b)2=c(a,c同号且a≠0).法那么:要把方程化为“左平方,右常数,先把系数化为1,再开平方取正负,分开求得方程解”.5.以下条件不能判定△ABC与△DEF相似的是()A.B.,∠A=∠DC.∠A=∠D,∠B=∠E D.,∠B=∠E【考点】相似三角形的判定.【分析】相似的判定有三种方式:①三边法:三组对应边的比相等的两个三角形相似;②两边及其夹角法:两组对应边的比相等且夹角对应相等的两个三角形相似;③两角法:有两组角对应相等的两个三角形相似,逐项分析即可.【解答】解:A、利用三边法能够判定△ABC与△DEF相似;B、不能判定相似,因为∠B、∠D不是这两组边对应的夹角;C、∠A=∠D,∠B=∠F,能够判定△ABC与△DEF相似;D、利用两边及其夹角的方式可判定△ABC与△DEF相似;应选B.【点评】此题考查了相似三角形的判定,把握相似三角形判定的三种方式是解答此题的关键.6.一个用于防震的L形包装塑料泡沫如下图,那么该物体的俯视图是()A.B.C.D.【考点】简单组合体的三视图.【分析】依照组合体的排放顺序能够取得正确的答案.【解答】解:从上面看该组合体的俯视图是一个矩形,而且被一条棱隔开,应选B.【点评】此题考查几何体的三种视图,比较简单.解决此题既要有丰硕的数学知识,又要有必然的生活体会.7.在反比例函数y=的图象的每一条曲线上,y都随x的增大而增大,那么k的值能够是()A.﹣1 B.0 C.1 D.2【考点】反比例函数的性质.【分析】关于函数来讲,当k<0时,每一条曲线上,y随x的增大而增大;当k>0时,每一条曲线上,y随x的增大而减小.【解答】解:反比例函数的图象上的每一条曲线上,y随x的增大而增大,∴1﹣k<0,∴k>1.应选:D.【点评】此题考查反比例函数的增减性的判定.在解题时,要注意整体思想的运用.易错易混点:学生对解析式中k的意义不睬解,直接以为k<0,错选A.8.有一个正方体,6个面上别离标有1~6这6个整数,抛掷那个正方体一次,那么显现向上一面的数字为偶数的概率是()A.B.C.D.【考点】概率公式.【分析】抛掷那个正方体会显现1到6共6个数字,每一个数字显现的机遇相同,即有6个可能结果,而这6个数中有2,4,6三个偶数,那么有3种可能.【解答】解:依照概率公式:P(显现向上一面的数字为偶数)=.应选C.【点评】用到的知识点为:概率等于所求情形数与总情形数之比.二、填空题9.如图,菱形ABCD的两条对角线相交于O,假设AC=6,BD=4,那么菱形ABCD 的周长是4.。

2017年人教版四年级上册语文期中试卷及答案

2017年人教版四年级上册语文期中试卷及答案

2017年⼈教版四年级上册语⽂期中试卷及答案 2017年的期中考试已经开始了,四年级的学⽣要做好语⽂试卷的练习,这样才能进步。

今天店铺就与⼤家分享:2017年⼈教版四年级上册语⽂期中试卷及答案,希望对⼤家的学习有帮助! 2017年⼈教版四年级上册语⽂期中试卷题⽬ ⼀、汉字 1、给加点的字选择正确的⾳节,在下⾯画“____”(3分) 镶嵌(xiāng xāng) 钢筋(jīng jīn) ⾯包屑(xuè xiè) 婴⼉(yīng yín) 材料(cái chái) 模糊(mú mó) 2、根据章节把下列词语写得漂亮。

(5分) cán kuì piān aì fèi téng hài hào dàng dàng ( ) ( ) ( ) ( ) nuò yán jiǔ wō bó dòu rén shēng ding fèi ( ) ( ) ( ) ( ) 3、你能区分下⾯的双胞胎吗?(8分) 钩( ) 辩( ) 尊( )毫( )资( )遭( ) 钓( ) 辨( ) 遵( )豪( )姿( )糟( ) qiǎ( ) zhēng( ) 卡挣 kǎ ( ) zhèng( ) ⼆、词语。

1、把词语补充完整(6分) 风平( )( ) 惊( )动( ) ( )( )⼤悟 震⽿( )( ) 五( )⼗( ) ( )( )⾃语 2、选词填空。

(6分) 强烈猛烈热烈 (1)风( )地摇动着路边的梧桐树。

(2)我们挡住了敌⼈( )的进攻。

(3)台下响起了( )的掌声。

安静宁静平静 (1)清晨,同学们的欢笑打破了校园的( )。

(2)望着⽼⼈远去的背影,我的⼼久久不能( )。

(3)演出开始了,剧场⾥⽴即( )了下来。

2017年重点中学九年级上学期期中数学试卷两套汇编二附答案解析

2017年重点中学九年级上学期期中数学试卷两套汇编二附答案解析

2017年重点中学九年级上学期期中数学试卷两套汇编二附答案解析九年级(上)期中数学试卷(解析版)一、选择题(共10小题,每题4分,总分值40分)1.以下图形中国,是中心对称图形的是()A.B.C.D.2.以下诗句所描述的事件中,是不可能事件的是()A.黄河入海流 B.锄禾日当午 C.大漠孤烟直 D.手可摘星辰3.点B与点A(﹣2,3)关于原点对称,点B的坐标为()A.(2,﹣3)B.(﹣2,3)C.(2,3)D.(﹣2,﹣3)4.抛物线y=(x+2)2﹣3能够由抛物线y=x2平移取得,那么以下平移进程正确的选项是()A.先向左平移2个单位,再向上平移3个单位B.先向左平移2个单位,再向下平移3个单位C.先向右平移2个单位,再向下平移3个单位D.先向右平移2个单位,再向上平移3个单位5.如图,⊙O是△ABC的外接圆,连接OA,OB,∠OBA=50°,那么∠C的度数为()A.30°B.40°C.50° D.80°6.如图,在方格纸中,随机选择标有序号①②③④⑤中的一个小正方形涂黑,与图中阴影部份组成轴对称图形的概率是()A.B.C.D.7.已知⊙O的半径为3,圆心O到直线L的距离为2,那么直线L与⊙O的位置关系是()A.不能确信B.相离C.相切D.相交8.用反证法证明命题“三角形中必有一个内角小于或等于60°”时,第一应假设那个三角形中()A.每一个内角都大于60°B.每一个内角都小于60°C.有一个内角大于60°D.有一个内角小于60°9.如图,一个宽为2 cm的刻度尺在圆上移动,当刻度尺的一边与圆相切时,另一边与圆两个交点处的读数恰好为“2”和“8”(单位:cm),那么该圆的半径为()A.cm B.cm C.3cm D.cm10.已知二次函数y=ax2+bx+c(a≠0)的图象如下图,给出以下结论:①abc <0;②2a+b=0;③当x=﹣1或x=3时,函数y的值都等于0;④4a+2b+c>0,其中正确结论的个数是()A.1个B.2个C.3个D.4个二、填空题(共6小题,每题4分,总分值24分)11.抛物线y=2(x﹣1)2+5的极点坐标是.12.函数的图象是抛物线,那么m= .13.已知圆锥的底面半径是2,母线长是4,那么圆锥的侧面积是.14.关于x的一元二次方程(a﹣5)x2﹣4x﹣1=0有实数根,那么实数a的取值范围是.15.如图,正方形OABC的两边OA、OC别离在x轴、y轴上,点D(5,3)在边AB上,以C为中心,把△CDB旋转90°,那么旋转后点D的对应点D′的坐标是.16.如图,Rt△ABC中,∠C=90°,假设AC=4,BC=3,那么△ABC的内切圆半径r= .三、解答题17.(12分)解以下方程(1)x2+x﹣1=0(2)x(x﹣2)+x﹣2=0.18.(6分)如图4×4的正方形网格中,将△MNP绕某点旋转必然的角度,取得△M1N1P1,试用尺规作图法确信旋转中心A点(保留作图痕迹,标出A点)19.(8分)一只不透明袋子中装有1个红球,2个黄球,这些球除颜色外都相同,小明搅匀后从中任意摸出一个球,记录颜色后放回、搅匀,再从中任意摸出1个球,用树状图或列表法列出摸出球的所有等可能情形,并求两次摸出的球都是黄色的概率.20.(8分)如图,AD,BC是⊙O的两条弦,且AD=BC,求证:AB=CD.21.(8分)某小区计划在一块长32米,宽20米的矩形场地修建三条一样宽的小路,使其中两条平行,另一条与之垂直,其余部份种草,草坪的面积为570米2,小路的宽度应是多少?22.(8分)在直角坐标平面内,点 O为坐标原点,二次函数 y=x2+(k﹣5)x﹣(k+4)的图象交 x轴于点A(x1,0)、B(x2,0),且(x1+1)(x2+1)=﹣8.求二次函数解析式.23.(8分)如图,在△ABC中,AB=AC,以AB为直径的⊙O交BC于点M,MN⊥AC于点N.求证:MN是⊙O的切线.24.(8分)如图,正方形ABCD中,E为CD上一点,F为BC延长线上一点,CE=CF.(1)△DCF能够看做是△BCE绕点C旋转某个角度取得的吗?说明理由.(2)假设∠CEB=60°,求∠EFD的度数.25.(8分)为了响应政府提出的由中国制造向中国制造转型的号召,某公司自主设计了一款本钱为40元的可控温杯,并投放市场进行试销售,通过调查发觉该产品天天的销售量y(件)与销售单价x(元)知足一次函数关系:y=﹣10x+1200.(1)求出利润S(元)与销售单价x(元)之间的关系式(利润=销售额﹣本钱);(2)当销售单价定为多少时,该公司天天获取的利润最大?最大利润是多少元?26.(12分)已知二次函数y=x2+bx+c的图象过点A(﹣3,0)和点B(1,0),且与y轴交于点C,D点在抛物线上且横坐标是﹣2.(1)求抛物线的解析式;(2)抛物线的对称轴上有一动点P,求出PA+PD的最小值.参考答案与试题解析一、选择题(共10小题,每题4分,总分值40分)1.以下图形中国,是中心对称图形的是()A.B.C.D.【考点】中心对称图形.【分析】依照中心对称图形的概念对各选项分析判定即可得解.【解答】解:A、不是中心对称图形,故本选项错误;B、不是中心对称图形,故本选项错误;C、是中心对称图形,故本选项正确;D、不是中心对称图形,故本选项错误.应选C.【点评】此题考查了中心对称图形的概念,中心对称图形是要寻觅对称中心,旋转180度后两部份重合.2.以下诗句所描述的事件中,是不可能事件的是()A.黄河入海流 B.锄禾日当午 C.大漠孤烟直 D.手可摘星辰【考点】随机事件.【分析】不可能事件是指在必然条件下,必然不发生的事件.【解答】解:A、是必然事件,应选项错误;B、是随机事件,应选项错误;C、是随机事件,应选项错误;D、是不可能事件,应选项正确.应选D.【点评】此题要紧考查了必然事件,不可能事件,随机事件的概念.明白得概念是解决这种基础题的要紧方式.必然事件指在必然条件下,必然发生的事件;不可能事件是指在必然条件下,必然不发生的事件;不确信事件即随机事件是指在必然条件下,可能发生也可能不发生的事件.3.点B与点A(﹣2,3)关于原点对称,点B的坐标为()A.(2,﹣3) B.(﹣2,3) C.(2,3)D.(﹣2,﹣3)【考点】关于原点对称的点的坐标.【分析】依照平面直角坐标系中任意一点P(x,y),关于原点的对称点是(﹣x,﹣y),然后直接作答即可.【解答】解:∵点B与点A(﹣2,3)关于原点对称,∴点B的坐标为:(2,﹣3).应选:A.【点评】此题考查关于原点对称的点坐标的关系,是需要熟记的大体问题,经历方式能够结合平面直角坐标系的图形.4.抛物线y=(x+2)2﹣3能够由抛物线y=x2平移取得,那么以下平移进程正确的选项是()A.先向左平移2个单位,再向上平移3个单位B.先向左平移2个单位,再向下平移3个单位C.先向右平移2个单位,再向下平移3个单位D.先向右平移2个单位,再向上平移3个单位【考点】二次函数图象与几何变换.【分析】依照“左加右减,上加下减”的原那么进行解答即可.【解答】解:抛物线y=x2向左平移2个单位可取得抛物线y=(x+2)2,抛物线y=(x+2)2,再向下平移3个单位即可取得抛物线y=(x+2)2﹣3.故平移进程为:先向左平移2个单位,再向下平移3个单位.应选:B.【点评】此题考查的是二次函数的图象与几何变换,要求熟练把握平移的规律:左加右减,上加下减.5.如图,⊙O是△ABC的外接圆,连接OA,OB,∠OBA=50°,那么∠C的度数为()A.30°B.40°C.50°D.80°【考点】圆周角定理.【分析】第一由OA=OB,∠OBA=50°,求得∠AOB的度数,然后由圆周角定理的性质,求得答案.【解答】解:∵OA=OB,∠OBA=50°,∴∠OAB=∠OBA=50°,∴∠AOB=180°﹣∠OAB﹣∠OBA=80°,∴∠C=∠AOB=40°.应选B.【点评】此题考查了圆周角定理和等腰三角形的性质.注意在同圆或等圆中,同弧或等弧所对的圆周角相等,都等于这条弧所对的圆心角的一半.6.如图,在方格纸中,随机选择标有序号①②③④⑤中的一个小正方形涂黑,与图中阴影部份组成轴对称图形的概率是()A.B.C.D.【考点】概率公式;轴对称图形.【分析】由随机选择标有序号①②③④⑤中的一个小正方形涂黑,共有5种等可能的结果,使与图中阴影部份组成轴对称图形的有3种情形,直接利用概率公式求解即可求得答案.【解答】解:∵在方格纸中,随机选择标有序号①②③④⑤中的一个小正方形涂黑,共有5种等可能的结果,使与图中阴影部份组成轴对称图形的有②④⑤,3种情形,∴使与图中阴影部份组成轴对称图形的概率是:3÷5=.应选C.【点评】此题考查了概率公式的应用.注意用到的知识点为:概率=所求情形数与总情形数之比.也考查了轴对称图形的概念.7.已知⊙O的半径为3,圆心O到直线L的距离为2,那么直线L与⊙O的位置关系是()A.不能确信B.相离C.相切D.相交【考点】直线与圆的位置关系.【分析】判定直线和圆的位置关系:设⊙O的半径为r,圆心O到直线l的距离为d.①直线l和⊙O相交⇔d<r②直线l和⊙O相切⇔d=r③直线l和⊙O相离⇔d>r.【解答】解:∵⊙O的半径为3,圆心O到直线L的距离为2,∴r=3,d=2,∴d<r,∴直线与圆相交,应选D.【点评】此题考查直线由圆位置关系,记住.①直线l和⊙O相交⇔d<r②直线l和⊙O相切⇔d=r③直线l和⊙O相离⇔d>r是解题的关键.8.用反证法证明命题“三角形中必有一个内角小于或等于60°”时,第一应假设那个三角形中()A.每一个内角都大于60° B.每一个内角都小于60°C.有一个内角大于60°D.有一个内角小于60°【考点】反证法.【分析】熟记反证法的步骤,然后进行判定即可.【解答】解:用反证法证明“三角形中必有一个内角小于或等于60°”时,应先假设三角形中每一个内角都不小于或等于60°,即都大于60°.应选:A.【点评】此题要紧考查了反证法,反证法的步骤是:(1)假设结论不成立;(2)从假设动身推出矛盾;(3)假设不成立,那么结论成立.在假设结论不成立时要注意考虑结论的反面所有可能的情形,若是只有一种,那么否定一种就能够够了,若是有多种情形,那么必需一一否定.9.如图,一个宽为2 cm的刻度尺在圆上移动,当刻度尺的一边与圆相切时,另一边与圆两个交点处的读数恰好为“2”和“8”(单位:cm),那么该圆的半径为()A. cm B. cm C.3cm D. cm【考点】垂径定理;勾股定理.【分析】依照题意得上图.已知弦长和弓形高,求半径.运用垂径定理和勾股定理求解.【解答】解:依照题意得右图,设OC=r,那么OB=r﹣2.因为DC=8﹣2=6cm,依照垂径定理,CB=6×=3cm.依照勾股定理:r2=(r﹣2)2+32,解得r=cm.应选D.【点评】此题结合一个有趣的实际问题要紧考查:垂径定理、勾股定理,渗透数学建模思想.10.已知二次函数y=ax2+bx+c(a≠0)的图象如下图,给出以下结论:①abc<0;②2a+b=0;③当x=﹣1或x=3时,函数y的值都等于0;④4a+2b+c>0,其中正确结论的个数是()A.1个B.2个C.3个D.4个【考点】二次函数图象与系数的关系.【分析】此题能够先从函数图象上取得一些信息,确信出函数与系数的关系,然后再对各个结论进行判定.【解答】解:依照函数图象,咱们能够取得以下信息:a<0,c>0,对称轴x=1,b>0,与x轴交于(﹣1,0)(3,0)两点.①abc<0,正确;②∵对称轴x=﹣=1时,∴2a+b=0,正确;③当x=﹣1或x=3时,函数y的值都等于0,正确;④当x=2时,y=4a+2b+c>0,正确;应选D.【点评】此题考查了二次函数图象与系数的关系,并结合系数和图象正确判定各结论.二、填空题(共6小题,每题4分,总分值24分)11.抛物线y=2(x﹣1)2+5的极点坐标是(1,5).【考点】二次函数的性质.【分析】依照极点式的坐标特点直接写出极点坐标.【解答】解:∵y=2(x﹣1)2+5是抛物线解析式的极点式,依照极点式的坐标特点可知,极点坐标为(1,5).【点评】考查极点式y=a(x﹣h)2+k中,极点坐标是(h,k).12.函数的图象是抛物线,那么m= ﹣1 .【考点】二次函数的概念.【分析】依照二次函数的概念列式求解即可.【解答】解:依照二次函数的概念,m2+1=2且m﹣1≠0,解得m=±1且m≠1,因此,m=﹣1.故答案为:﹣1.【点评】此题考查二次函数的概念,要注意二次项的系数不等于0.13.已知圆锥的底面半径是2,母线长是4,那么圆锥的侧面积是8π.【考点】圆锥的计算.【分析】圆锥的侧面积=底面周长×母线长÷2.【解答】解:底面半径是2,那么底面周长=4π,圆锥的侧面积=×4π×4=8π.【点评】此题利用了圆的周长公式和扇形面积公式求解.14.关于x的一元二次方程(a﹣5)x2﹣4x﹣1=0有实数根,那么实数a的取值范围是a≥1且a≠5 .【考点】根的判别式;一元二次方程的概念.【分析】在与一元二次方程有关的求值问题中,必需知足以下条件:(1)二次项系数不为零;(2)在有实数根下必需知足△=b2﹣4ac≥0.【解答】解:因为关于x的一元二次方程有实根,因此△=b2﹣4ac=16+4(a﹣5)≥0,解之得a≥1.∵a﹣5≠0∴a≠5∴实数a的取值范围是a≥1且a≠5故答案为a≥1且a≠5.【点评】此题考查了一元二次方程ax2+bx+c=0(a≠0,a,b,c为常数)根的判别式.当△>0,方程有两个不相等的实数根;当△=0,方程有两个相等的实数根;当△<0,方程没有实数根.15.如图,正方形OABC的两边OA、OC别离在x轴、y轴上,点D(5,3)在边AB上,以C为中心,把△CDB旋转90°,那么旋转后点D的对应点D′的坐标是(﹣2,0)或(2,10).【考点】坐标与图形转变-旋转.【分析】依照题意,分顺时针旋转和逆时针旋转两种情形,求出点D′到x轴、y轴的距离,即可判定出旋转后点D的对应点D′的坐标是多少即可.【解答】解:因为点D(5,3)在边AB上,因此AB=BC=5,BD=5﹣3=2;(1)假设把△CDB顺时针旋转90°,那么点D′在x轴上,OD′=2,因此D′(﹣2,0);(2)假设把△CDB逆时针旋转90°,那么点D′到x轴的距离为10,到y轴的距离为2,因此D′(2,10),综上,旋转后点D的对应点D′的坐标为(﹣2,0)或(2,10).故答案为:(﹣2,0)或(2,10).【点评】此题要紧考查了坐标与图形转变﹣旋转,考查了分类讨论思想的应用,解答此题的关键是要注意分顺时针旋转和逆时针旋转两种情形.16.如图,Rt△ABC中,∠C=90°,假设AC=4,BC=3,那么△ABC的内切圆半径r= 1 .【考点】三角形的内切圆与内心.【分析】第一求出AB的长,再连圆心和各切点,利用切线长定理用半径表示AF 和BF,而它们的和等于AB,取得关于r的方程,即可求出.【解答】解:如图,设△ABC的内切圆与各边相切于D,E,F,连接OD,OE,OF,则OE⊥BC,OF⊥AB,OD⊥AC,设半径为r,CD=r,∵∠C=90°,AC=4,BC=3,∴AB=5,∴BE=BF=3﹣r,AF=AD=4﹣r,∴4﹣r+3﹣r=5,∴r=1.∴△ABC的内切圆的半径为 1.故答案为;1.【点评】此题要紧考查了勾股定理和直角三角形内切圆半径求法等知识,熟练把握切线长定理和勾股定理是解题的关键.三、解答题17.(12分)(2016春•新疆期末)解以下方程(1)x2+x﹣1=0(2)x(x﹣2)+x﹣2=0.【考点】解一元二次方程-因式分解法;解一元二次方程-公式法.【分析】(1)利用公式法解方程;(2)利用因式分解法解方程.【解答】解:(1)△=12﹣4×1×(﹣1)=5,x=,因此x1=,x2=;(4)(x﹣2)(x+1)=0,x﹣2=0或x+1=0,因此x1=2,x2=﹣1.【点评】此题考查了解一元二次方程﹣因式分解法:确实是先把方程的右边化为0,再把左侧通过因式分解化为两个一次因式的积的形式,那么这两个因式的值就都有可能为0,这就能够取得两个一元一次方程的解,如此也就把原方程进行了降次,把解一元二次方程转化为解一元一次方程的问题了(数学转化思想).也考查了公式法解一元二次方程.18.如图4×4的正方形网格中,将△MNP绕某点旋转必然的角度,取得△M1N1P1,试用尺规作图法确信旋转中心A点(保留作图痕迹,标出A点)【考点】作图-旋转变换.【分析】利用关于点对称图形的性质得出对应点到旋转中心的距离相等,进而作出对应点连线的垂直平分线进而得出其交点.【解答】解:如下图;A点即为所求.【点评】此题要紧考查了图形的旋转变换,利用关于点对称的图形性质得出是解题关键.19.一只不透明袋子中装有1个红球,2个黄球,这些球除颜色外都相同,小明搅匀后从中任意摸出一个球,记录颜色后放回、搅匀,再从中任意摸出1个球,用树状图或列表法列出摸出球的所有等可能情形,并求两次摸出的球都是黄色的概率.【考点】列表法与树状图法.【分析】第一依照题意画出树状图,然后由树状图求得所有等可能的结果与两次摸出的球都是黄球的情形,再利用概率公式即可求得答案.【解答】解:画树状图得:∵共有9种等可能的结果,两次摸出的球都是黄球的有4种情形,∴两次摸出的球都是红球的概率为:.【点评】此题考查的是用列表法或树状图法求概率.列表法能够不重复不遗漏的列出所有可能的结果,适合于两步完成的事件;树状图法适合两步或两步以上完成的事件;解题时要注意此题是放回实验仍是不放回实验.用到的知识点为:概率=所求情形数与总情形数之比.20.如图,AD,BC是⊙O的两条弦,且AD=BC,求证:AB=CD.【考点】圆心角、弧、弦的关系.【分析】依照圆心角、弧、弦的关系定理,弦AD=BC,那么弧AD=弧BC,那么弧AB=弧CD,那么AB=CD.【解答】证明:∵AD=BC,∴=,∴+=+,即=.∴AB=CD.【点评】此题考查了圆心角、弦、弧之间的关系定理,在同圆或等圆中,两个圆心角、两条弧、两个弦中有一组量相等,它们所对应的其余各组量也相等.21.某小区计划在一块长32米,宽20米的矩形场地修建三条一样宽的小路,使其中两条平行,另一条与之垂直,其余部份种草,草坪的面积为570米2,小路的宽度应是多少?【考点】一元二次方程的应用.【分析】设小路的宽是x米,可表示出草坪的长和宽,依照草坪的面积为570米2,可列方程求解.【解答】解:设小路的宽是x米,(20﹣x)(32﹣2x)=570x=1或x=35(舍去).故小路的宽为1米.【点评】此题考查明白得题意的能力,关键是表示出草坪的长和宽,依照面积列出方程.22.在直角坐标平面内,点 O为坐标原点,二次函数 y=x2+(k﹣5)x﹣(k+4)的图象交 x轴于点A(x1,0)、B(x2,0),且(x1+1)(x2+1)=﹣8.求二次函数解析式.【考点】待定系数法求二次函数解析式.【分析】利用根与系数的关系求出k的值,即可确信出二次函数解析式.【解答】解:由题意得:x1,x2为方程x2+(k﹣5)x﹣(k+4)=0的解,∴x1+x2=﹣(k﹣5)=5﹣k,x1x2=﹣(k+4)=﹣k﹣4,∵(x1+1)(x2+1)﹣8,即x1x2+(x1+x2)+1=﹣8,∴﹣k﹣4+5﹣k+1=﹣8,解得:k=5,则y=x2﹣9.【点评】此题考查了待定系数法求二次函数解析式,熟练把握运算法那么是解此题的关键.23.如图,在△ABC中,AB=AC,以AB为直径的⊙O交BC于点M,MN⊥AC于点N.求证:MN是⊙O的切线.【考点】切线的判定;等腰三角形的性质.【分析】连接OM,证得OM∥AC,由MN⊥AC,易患OM⊥MN,可得结论.【解答】证明:连接OM,∵AB=AC,∴∠B=∠C,∵OB=OM,∴∠B=∠OMB,∴∠OMB=∠C,∴OM∥AC,∵MN⊥AC,∴OM⊥MN.∵点M在⊙O上,∴MN是⊙O的切线.【点评】此题考查的是切线的判定,过切点,连半径是解答此题的关键.24.如图,正方形ABCD中,E为CD上一点,F为BC延长线上一点,CE=CF.(1)△DCF能够看做是△BCE绕点C旋转某个角度取得的吗?说明理由.(2)假设∠CEB=60°,求∠EFD的度数.【考点】旋转的性质;正方形的性质.【分析】(1)依照正方形的性质及全等三角形的判定方式即可证明△BCE≌△DCF,据此即可解答;(2)由两个三角形全等的性质得出∠CFD的度数,再用等腰三角形的性质求∠EFD的度数.【解答】(1)证明:∵四边形ABCD是正方形,∴DC=BC,∠DCB=∠FCE,∵CE=CF,∴△DCF≌△BCE,则△DCF能够看做是△BCE绕点C顺时针旋转90°取得;(2)解:∵△BCE≌△DCF,∴∠DFC=∠BEC=60°,∵CE=CF,∴∠CFE=45°,∴∠EFD=15°.【点评】此题要紧考查正方形的特殊性质及全等三角形的判定的综合运用.25.为了响应政府提出的由中国制造向中国制造转型的号召,某公司自主设计了一款本钱为40元的可控温杯,并投放市场进行试销售,通过调查发觉该产品天天的销售量y(件)与销售单价x(元)知足一次函数关系:y=﹣10x+1200.(1)求出利润S(元)与销售单价x(元)之间的关系式(利润=销售额﹣本钱);(2)当销售单价定为多少时,该公司天天获取的利润最大?最大利润是多少元?【考点】二次函数的应用.【分析】(1)依照“总利润=单件的利润×销售量”列出二次函数关系式即可;(2)将取得的二次函数配方后即可确信最大利润.【解答】解:(1)S=y(x﹣40)=(x﹣40)(﹣10x+1200)=﹣10x2+1600x﹣48000;(2)S=﹣10x2+1600x﹣48000=﹣10(x﹣80)2+16000,那么当销售单价定为80元时,工厂天天取得的利润最大,最大利润是16000元.【点评】此题要紧考查了二次函数的性质在实际生活中的应用,最大销售利润的问题常利函数的增减性来解答,要注意应该在自变量的取值范围内求最大值(或最小值).26.(12分)(2021•湖州模拟)已知二次函数y=x2+bx+c的图象过点A(﹣3,0)和点B(1,0),且与y轴交于点C,D点在抛物线上且横坐标是﹣2.(1)求抛物线的解析式;(2)抛物线的对称轴上有一动点P,求出PA+PD的最小值.【考点】二次函数综合题.【分析】(1)把A(﹣3,0)和点B(1,0),代入y=x2+bx+c,成立关于b,c 的二元一次方程组,求出b,c即可;(2)先求出抛物线的对称轴,又因为A,B关于对称轴对称,因此连接BD与对称轴的交点即为所求P点.【解答】解:(1)将A(﹣3,0),B(1,0)代入y=x2+bx+c,得,解得∴y=x2+2x﹣3;(2)∵y=x2+2x﹣3=(x+1)2﹣4∴对称轴x=﹣1,又∵A,B关于对称轴对称,∴连接BD与对称轴的交点即为所求P点.过D作DF⊥x轴于F.将x=﹣2代入y=x2+2x﹣3,则y=4﹣4﹣3=﹣3,∴D(﹣2,﹣3)∴DF=3,BF=1﹣(﹣2)=3Rt△BDF中,BD=∵PA=PB,∴PA+PD=BD=.故PA+PD的最小值为.【点评】此题要紧考查了用待定系数法求二次函数解析式和求二次函数对称轴,和点关于某直线对称的问题,难度适中,具有必然的综合性.九年级(上)期中数学试卷一、选择题下面的图形中,既是轴对称图形又是中心对称图形的是()A.B.C. D.2.关于x的一元一次方程(a﹣1)x2+x+a2﹣1=0的一个解是0,那么a的值为()A.1 B.﹣l C.1 或﹣1 D.23.假设一个三角形的三边均知足x2﹣6x+8=0,那么此三角形的周长为()A.6 B.12C.10 D.以上三种情形都有可能4.用配方式解方程x2﹣2x﹣5=0时,原方程应变形为()A.(x+1)2=6 B.(x﹣1)2=6 C.(x+2)2=9 D.(x﹣2)2=95.已知二次函数y=kx2﹣7x﹣7的图象和x轴有交点,那么k的取值范围是()A.k>﹣ B.k≥﹣ C.k≥﹣且k≠0 D.k>﹣且k≠06.一台机械原价60万元,若是每一年的折旧率为x,两年后这台机械的价位为y万元,那么y关于x的函数关系式为()A.y=60(1﹣x)2B.y=60(1﹣x2)C.y=60﹣x2D.y=60(1+x)27.如图,已知点O是等边△ABC三条高的交点,现将△AOB绕点O旋转,要使旋转后能与△BOC重合,那么旋转的最小角度为()A.60°B.120°C.240°D.360°8.二次函数y=ax2+bx+c(a≠0)的图象如图,结论:①ac<0;②a﹣b+c<0;③b2﹣4ac≥0;④y随x的增大而增大,其中正确的个数()A.4个B.3个C.2个D.1个9.已知a<0,那么点P(﹣a2,﹣a+1)关于原点的对称点P′在()A.第一象限B.第二象限C.第三象限D.第四象限10.在同一直角坐标系中,函数y=mx+m和y=﹣mx2+2x+2(m是常数,且m≠0)的图象可能是()A.B.C.D.二、填空题11.方程(x﹣3)2=x﹣3的根是.12.二次函数y=x2+4x+5中,当x= 时,y有最小值.13.假设抛物线y=x2﹣x﹣12与x轴别离交于A、B两点,那么AB的长为.14.已知点A(x1,y1),B(x2,y2)在二次函数y=(x﹣1)2+1的图象上,假设x1<x2<1,那么y1y2.(填“>”“=”或“<”)15.如下图,把一个直角三角尺ACB绕着30°角的极点B顺时针旋转,使得点A落在CB的延长线上的点E处,那么∠BDC的度数为度.16.已知二次函数y1=ax2+bx+c与一次函数y2=kx+m(k≠0)的图象相交于点A(﹣2,4),B(8,2).如下图,那么能使y1>y2成立的x的取值范围是.三、解答题(共72分)17.(12分)解方程:①(2x+1)2=3(2x+1)②4(x﹣1)2﹣9(3﹣2x)2=0.18.(12分)已知:关于x的一元二次方程x2﹣(k+1)x﹣6=0,(1)求证:关于任意实数k,方程有两个不相等的实数根;(2)假设方程的一个根是2,求k的值及方程的另一个根.19.(12分)如图,已知二次函数y=﹣+bx+c的图象通过A(2,0)、B(0,﹣6)两点.(1)求那个二次函数的解析式;(2)设该二次函数的对称轴与x轴交于点C,连接BA、BC,求△ABC的面积.20.(10分)如图,在△ABC中,∠B=90°,AB=6cm,BC=8cm,动点P从点A 开始沿AB边向B以1cm/s的速度移动(不与点B重合);动点Q从B点开始沿BC边向点C以2cm/s的速度移动(不与点C重合).若是P、Q别离从A、B同时动身,动身多少秒后,四边形APQC的面积为16cm2?21.(12分)如图,在平面直角坐标系中,Rt△ABC的三个极点别离是A(﹣3,2),B(0,4),C(0,2).(1)将△ABC以点C为旋转中心旋转180°,画出旋转后对应的△A1B1C;平移△ABC,假设点A的对应点A2的坐标为(0,﹣4),画出平移后对应的△A2B2C2;(2)假设将△A1B1C绕某一点旋转能够取得△A2B2C2;请直接写出旋转中心的坐标;(3)在x轴上有一点P,使得PA+PB的值最小,请直接写出点P的坐标.22.(14分)某商场要经营一种新上市的文具,进价为20元,试营销时期发觉:当销售单价是25元时,天天的销售量为250件,销售单价每上涨1元,天天的销售量就减少10件.①写出商场销售这种文具,天天所得的销售利润w(元)与销售单价x(元)之间的函数关系式,并写出x的取值范围.②假设商场要天天取得销售利润2000元,销售单价应定为多少元?③求销售单价为多少元时,该文具天天的销售利润最大?最大利润是多少?参考答案与试题解析一、选择题(2016秋•杭锦后旗校级期中)下面的图形中,既是轴对称图形又是中心对称图形的是()A.B.C. D.【考点】中心对称图形;轴对称图形.【分析】依照轴对称图形与中心对称图形的概念求解.【解答】解:A、是轴对称图形,不是中心对称图形,故此选项错误;B、是轴对称图形,不是中心对称图形,故此选项错误;C、不是轴对称图形,是中心对称图形,故此选项错误;D、是轴对称图形,也是中心对称图形,故此选项正确.应选:D.【点评】此题要紧考查了中心对称图形与轴对称图形的概念.轴对称图形的关键是寻觅对称轴,图形两部份折叠后可重合,中心对称图形是要寻觅对称中心,旋转180°后两部份重合.2.关于x的一元一次方程(a﹣1)x2+x+a2﹣1=0的一个解是0,那么a的值为()A.1 B.﹣l C.1 或﹣1 D.2【考点】一元一次方程的解.【分析】把x=0代入方程(a﹣1)x2+x+a2﹣1=0,即可解答.【解答】解:把x=0代入方程(a﹣1)x2+x+a2﹣1=0,可得:a2﹣1=0,解得:a=±1,∵(a﹣1)x2+x+a2﹣1=0是关于x的一元一次方程,∴a﹣1=0,∴a=1,应选:A.【点评】此题考查了一元一次方程的解和解一元一次方程的应用,解此题的关键是得出关于a的一元一次方程,难度适中.3.假设一个三角形的三边均知足x2﹣6x+8=0,那么此三角形的周长为()A.6 B.12C.10 D.以上三种情形都有可能【考点】解一元二次方程-因式分解法;三角形三边关系.【分析】先利用因式分解法解方程x2﹣6x+8=0,取得x1=4,x2=2,由于一个三角形的三边均知足x2﹣6x+8=0,那么那个三角形的三边为4、4、4或2、2、2或4、4、2,然后计算周长.【解答】解:∵(x﹣4)(x﹣2)=0,∴x﹣4=0或x﹣2=0,∴x1=4,x2=2.∵一个三角形的三边均知足x2﹣6x+8=0,∴那个三角形的三边为4、4、4或2、2、2或4、4、2,∴那个三角形的周长为12或6或10.应选D.【点评】此题考查了解一元二次方程﹣因式分解法:先把一元二次方程化为一样式,然后把方程左侧分解为两个一次式的积,从而可把一元二次方程化为两个一元一次方程,解两个一元一次方程,取得一元二次方程的解.也考查了三角形三边的关系.4.用配方式解方程x2﹣2x﹣5=0时,原方程应变形为()A.(x+1)2=6 B.(x﹣1)2=6 C.(x+2)2=9 D.(x﹣2)2=9【考点】解一元二次方程-配方式.【分析】方程常数项移到右边,两边加上1变形即可取得结果.【解答】解:方程移项得:x2﹣2x=5,配方得:x2﹣2x+1=6,即(x﹣1)2=6.应选:B【点评】此题考查了解一元二次方程﹣配方式,熟练把握完全平方公式是解此。

2017—20l8学年度第一学期期中考试试卷

2017—20l8学年度第一学期期中考试试卷

2017—20l8学年度第一学期期中考试试卷(考试时间:120分钟试卷满分:150分)注意事项:1.本试卷由四个部分组成。

其中,第一、二部分和第三部分的第一节为选择题。

第三部分的第二节和第四部分为非选择题。

2.答卷前,考生务必将自己的姓名、准考证号填写在答题卡上。

3.回答选择题时,选出每小题答案后,用2B铅笔把答题卡上对应题目的答案标号涂黑;回答非选择题时,将答案写在答题卡上,写在本试卷上无效。

第一部分:听力(共20小题,每题1.5分,满分30分)做题时,先将答案标在试卷上。

录音内容结束后,你将有两分钟的时间将试卷上的答案转涂到答题卡上。

第一节 (共5小题;每小题1.5分,满分7.5分)听下面5段对话。

每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1.Where does the conversation take place?A.On a bus. B.In an elevator. C.In a taxi.2.What will the man do in Edinburgh?A.Do business with Justin.B.Give Justin the medicines.C.Tell Justin his new address.3.What kind of music does the man like? A.Jazz.B.Classical.C.Folk.4.When does the conversation take place?A.In February.B.In April.C.In S eptember.5.Whose advice did the woman follow?A.The shop assistant's.B.Her sister's.C.H er mother's.第二节 (共15小题;每小题15分,满分22.5分) [.听下面5段对话或独白。

2017学年度第一学期八年级期中考试

2017学年度第一学期八年级期中考试

2017学年度第一学期八年级期中考试物理试卷(满分100分,考试时间70分钟) 2017.11考生注意: 本卷共有33题。

请将所有答案写在答题卷上,写在试卷上不计分 一、选择题(共24分)1.下列估测与实际情况相符的是( )A .90分贝是较为理想的安静环境B.一位中学生的质量约为50千克 C .一只鸡蛋的质量约为150克D.一节物理课的时间约为4.5小时 2. 在“摆”的故事与启示中,伽利略的探究顺序是( ) A.猜想——实验——观察B . 实验——猜想——观察 C. 观察——猜想——实验 D.实验——观察——猜想3. 综艺节目《隐藏的歌手》是让观众报名参加模仿某位明星唱歌,其实这些观众是在模仿这位明星的( )A .音色B .音调C .响度D .频率 4.下列不属于光的反射现象的是 ( ) A.黑板上粉笔字的反光。

B.白云、飞鸟在湖中的倒影。

C.平面镜中人的像。

D.夜晚,路灯下的人影。

5.如图1所示是我们经常在学校附近看到的禁鸣标志,请你在下列方法中,选出与这种控制噪声的方法相同的是( ) A .上课时关闭教室的门窗 B .在道路旁设置隔声板 C .工人戴上防噪声耳罩 D .在摩托车上安装消声器6.我们坐在电影院里,从各个座位上都能看到银幕上的画面,这是因为( )A .银幕发出了光B .银幕上发生了漫反射C .银幕发生了镜面反射 D. 银幕是光源 7.下列四种做法会使物体质量发生改变的是( )A .一张纸被折叠成一只千纸鹤B .一块在密闭容器中的冰化成了水C .把一本书从上海带到北京D .老师上课时在黑板上写字的粉笔 8.下列各加点字中,不是用来描述声音响度的是 ( )A .生活中常说“响.鼓也得重槌敲”B .夜深了,请把电视机的音量调小.一些C .青春期后,男生的声音变得“低.沉”了D .在晚会上,小李同学“引吭高.歌” 学校_____________________ 班级__________ 姓名______________……………密○………………………………………封○………………………………………○线…………………………图19.一条入射光线与平面镜的夹角为30度,则平面镜使光的传播方向改变了 ( ) A .30° B .60°C .120°D .150°10.如图2,是手表在平面镜中的像,那么手表的实际时间是( ) A. 1:50 B. 10:50 C . 7:20 D. 10:10 11.下列说法中正确是( ) A.多次测量求平均值可以减小误差。

2017学年第二学期期中考试

2017学年第二学期期中考试

2017学年第二学期期中考试考生须知:1. 全卷分试卷和答卷。

试卷共 8 页,有四大题, 76 小题加翻译、写作,满分150分,考试时间 120 分钟。

2. 本卷全部答案必须做在答题卷的相应位置上,做在试题卷上无效。

1—55题请填涂到机读卡上, 其中,31-35题涂在61-65题,其他按题号涂。

第Ⅰ卷一、听力测试(共两节,20小题,每小题1.5分,满分30分)第一节听下面5段对话。

每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

Where was the man yesterday evening?A. At home.B. At the cinema.C. In the woman’s house.What will the man probably do tonight?A. Take a rest at home.B. Go to the dance.C. See a doctor.What are the speakers mainly talking about?A. Making money.B. Go shopping.C. Going on a trip.How much should the man pay for a night?A. $20.B. $30.C. $50.Why does the woman thank the man?A. He gave her a CD she wanted.B. He spent Christmas with her.C. He helped her a lot.第二节听下面5段对话或独白。

每段对话或独白后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

听每段对话或独白前,你将有时间阅读各个小题,每小题5秒钟;听完后,各小题将给出5秒钟的作答时间。

2017部编教材人教版八年级语文上册期中测试题及答案

2017部编教材人教版八年级语文上册期中测试题及答案

2017年度秋季学期八年级语文期中质量检测提示:一、总分值120分,完卷时刻120分钟。

二、请将答案填写在答题卡上。

一、语文知识积存与运用(1-6题每题2分,7题8分,第8题6分,第9题4分,共30分)1.选以下加点字注音全对的一项()(2分)A. 镌.刻(juān)翘.首(qiáo)溃.退(kuì) 锐不可当.(dànɡ)B. 要塞.(sāi)尴.尬(ɡān)悄.然(qiǎo)歼.灭(jiān)C.炽.热(zhì)轩邈.(miǎo)诘.责(ji é)差.使(chāi )D.文绉绉.(zhōu)屏.息(bǐng)仲.裁(zhòng) 踌.躇(chóu)2. 以下书写全数正确的一项为哪一项()(2分)A、暗然失色抑扬抑扬待人接物匿名B、粗制乱造荡然无存永垂不朽懊丧C、眼花缭乱名不虚传殚精竭虑凛冽D、锲而不舍振耳欲聋丰功伟绩管辖3、以下加点成语利用错误的一项为哪一项()(2分)A、在我国历史上曾显现过许多可歌可泣....的人物。

B、他的事迹在学校里早被传得众所周知....了C、在他杂乱无章....的房间里,我终于找到了那本册子。

D、她的穿着艳丽,十分引人注目....。

4. 以下句子的排列顺序,正确的一项为哪一项()(2分)给自己一点时刻,背上行囊,带上简单行李和旧相机,自己写字,自己拍照,走走停停。

踏访古村落,;梦游江南,;游走大漠,;探访名山,;江南的烟雨客,独到塞北看寒雪……所有的一切,需要咱们在路上!①聆听佛语梵音,晨钟暮鼓②坐在老屋子前发愣,阳光温柔抚摸③入目的即是黄沙白草,长河落日④感受杏花春雨,听苏子吟唱,渔歌互答A. ③①④②B. ②④③①C. ①②③④ D. ②①④③五、以下句子没有语病的一句()(2分)A.赤潮已成为世界性的一种公害,很多地域和国家发生都很频繁。

B.中国读者通过《时刻简史》这本书了解了英国闻名物理学家霍金。

2017学年第一学期期中考试卷_1

2017学年第一学期期中考试卷_1

2017学年第一学期期中考试卷第一部分:听力(30分)第一节(共5小题;每小题1.5分,满分7.5分)听下面五段对话。

每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

听完每段对话后,你都有15秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1. What does the man plan to do tonight?A. Go dancing.B.Do some writing.C.Do some reading.2. What color gloves does the woman like?A. GreenB.YellowC.Blue3. How much money will the man lend to the woman?A. $5.B.$15.C.$20.4. What did the woman think was a bit too salty?A. The fish.B.The beef.C.The soup.5. What time is it now?A. 9:30pm.B. 10:00pm.C.10:30pm.第二节(共15小题;每小题1.5分,满分22.5分)听下面五段对话或独白。

每段对话或独白后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。

听每段对话或独白前,你将有时间阅读各个小题,每小题5秒钟;听完后,各小题将给出5秒钟的作答时间。

每段对话或独白读两遍。

请听第6段材料,回答第6、7题。

6. Why does the man call the woman?A. To book a room.B. To confirm a room.C. To change a ro om.7. Which room will the man take?A. Room 13.B. Room 19.C. Room 26.请听第7段材料,回答第8、9题。

2017学年第一学期期中考试卷

2017学年第一学期期中考试卷

2017学年第一学期期中考试卷听力(共两节,满分30分,每小题1.5分)请听下面5段对话,选出最佳选项。

What does the man think of time travel in the future?It’s a strange idea. B. It’s impossible. C. It’s crazy. What does the woman want to buy?A bookcase. B. Two suitcases. C. Some books. What does the man complain about?His house. B. His work. C. The environment. How does the man stay in touch with his aunt?By phone. B. By e-mail. C. By short message. What does the man hope the government will do?Predict earthquakes in time.Provide more job opportunities.Change its attitude to the social problems.请听下面5段对话或独白,选出最佳选项。

请听第6段材料,回答6~7题How often can the man take a bath in his country?Once a month. B. Twice a month. C. Once a week.What is the biggest environment problem in the woman’s cou ntry?Water pollution. B. Air pollution. C. Noise pollution.请听第7段材料,回答8~9题Where does the man’s wife want to go?Somewhere in her country. B. Somewhere in Africa. C. Some where sunny.Which country is the man interested in?. B. Italy. C. America.请听第8段材料,回答10~12题How is the man now?He is still very weak. B. He has a sore throat. C. He has a r unny nose.What are the students doing now?Reviewing Unit 10. B. Studying Unit 10. C. Studying U nit 11.What happened to the woman’s mother?She got the flu several weeks ago.She has forgotten to take Vitamin C.She has got little sleep recently.请听第9段材料,回答13~16题How many people will attend the tea party?3. B.4. C.5.Who took a two-week trip?Julia. B. Pierre. C. Pierre’s sisters.What will the woman take to the tea party?Biscuits. B. French desserts.. C. A strawberry cak e.Where are the speakers now?In Canada. B. In Mexico. C. In .请听第10段材料,回答17~20题What was Peter probably poor at?Writing. B. Reading. C. Speaking.Why was Peter happy the first day?The family was pleasant and friendly.There was a girl of his age in the family.There was a comfortable bed in the home.What was Peter’s problem?He had little chance to talk.He was rather busy with his studies.He couldn’t get on well with the family.When did Peter start learning English?At age six. B. At age eight. C. At age ten.第二部分阅读理解(共两节,满分35分)(共10小题,每小题2.5分,满分25分)ALondoners are great readers. They buy vast numbers of ne wspapers and magazines and of books --- especially paperbacks, which are still comparatively cheap i n spite of ever-increasing rises in the costs of printing. They still continue to b uy “proper” books, too, printed on good paper and bound(装订)between hard covers.There are many streets in containing shops which specializ e in book-selling. Perhaps the best known of these is in the very heart of . Here bookshops of all sorts and sizes are to be found, fro m the celebrated one which boasts of being “the biggest book shop in the world” to the tiny, dusty little places which seem to have been left over from Dickens’ time. Some of these shops stock, or will obtain, any kind of book, but many of them specialize in second-hand books, in art books, in foreign books, in books on philos ophy, politics or any other of the countless subjects about whi ch books may be written. One shop in this area specializes on ly in books about ballet!Although it may be the most convenient place for Londoners to buy books, is not the cheapest. For the really cheap seco nd-hand books, the collector must venture off the beaten track, to , for example, in the East Central district of London. Here ther e is nothing so impressive as bookshops. The booksellers co me along each morning and pour out their sacks of books ont o small hand carts. And the collectors, some professionals an d some amateurs, have been waiting for them. In places like t his they can still, occasionally, pick up for a few pence an old one that may be worth many pounds.21. “Londoners are great readers” means that __________.A. Londoners are great because they read a lot.B. There are a great number of readers inC. Londoners are readers who read only great booksD. Londoners read a lot22. According to this passage, __________.A. is in the suburbs of LondonB. is famous for its bookshopsC. contains various kinds of shopsD. is the busiest street in23. In this passage, what does the underlined part “venture off the beaten track” mean? __________.A. buy books in a most busy streetB. move away from a b usy streetC. waste time looking for booksD. take a risk of losing o ne’s life24. On , _________.A. you can find fine bookshops for the latest booksB. there are only small bookshops for the second-hand booksC. you can see book sellers selling books on hand-cartsD. the same books as the ones in the bookshops of Charring Cross Road are soldBThe Golden Gate Bridge in San Francisco,California is one of the world's most beautiful bridges. It is als o one of the most visited places in the world. Vehicles(车辆)cross the bridge an average of 41 million times each year. More than 1800 hundred million vehicles have used the bridg e since it opened more than 70 years ago.The bridge was painted “International” because that color went well with the natural surroundings. The color also is easier to see in the heavy fog that often covers the area. But the w as not named for its orange color. It was named for the body of water that it crosses,the Golden Gate Strait.The Golden Gate Strait is the entrance to the San Francisco Bay from the Pacific Ocean. The Golden Gate Bridge links th e city of San Francisco with Marin County,California.Planning for the bridge began in the 1920s when the area ar ound was growing. People living in the area needed another way to get to the city besides small ferries(渡船).Joseph Strauss was the chief engineer for the project. Work began in 1934. Mr. Strauss demanded the strongest safety pr otections in the history of bridge building. These included the f irst use of “hard hats” to protect the workers' heads and speci al glasses to protect their eyes.A special safety net was suspended(挂)under the bridge. Th is net saved the lives of 19 men during the construction. How ever,11 other workers were killed when they fell from the bridge thr ough the net. Still,this was a new safety record for the time. The opened in 1937.It extends 1280 meters across the wat er. The total length is 2737 meters. It was the largest suspens ion bridge(吊桥)in the world until 1964.That is when the Verrazano Narrow s Bridge opened in . Today,the Golden Gate Bridge is the ninth longest suspension bridg e in the world.25.The purpose of suspending a special safety net is to ____ ____.A.protect the environment B.make construction eas ierC.prevent workers from falling D.save building materi als from falling26.What do we know about Joseph Strauss?A.He attached importance to the workers' safety.B.His safety measures were not of practical value.C.He built the first suspension bridge in the world.D.He demanded strong measures to ensure the safety of t he bridge.27.The passage is written to ________.A.invite readers toB.introduce theC.describe how the was builtD.tell the story of an engineer called Joseph StraussCEdward Hibberd Johnson was an American inventor. He lived in in the 1800s. In 1882, Johnson had an idea. It would chan ge the look of Christmas forever.Johnson worked as a boss at a technology company. In 1871, he hired a young man to work for him. The man's name was Thomas Edison. Edison was a great worker. He came up with many new ideas. Later, Edison left to start his own company. Johnson followed him. Johnson started turning Edison's ideas into money. In 1880, Edison invented the light bulb. No one k new how much it was worth. At the time, most homes did not have the electricity to power it. However, Johnson helped star t a company to sell the bulbs.Before long, Mr. Johnson had a bright idea. Christmas trees w ere very popular. They were so beautiful because of their can dles. Flickering (闪烁的) flames were perfect for Christmas. But they were also dan gerous. They could easily start a fire.Mr. Johnson thought of a way to fix this. He set up a Christma s tree by one of his windows. Then he took 80 colored light bu lbs and hung them around it. The lights were red, white and bl ue. People on the street stopped to look. They admired the sh ining Christmas tree. It was so popular that Johnson made it atradition. Each year he added more lights. In 1884, there wer e 120 light bulbs on his tree. The lights were not cheap. In 19 00, a string of 16 bulbs cost $12. That was a lot of money bac k then, because people made less. In today's money, that is a bout $350. But over time, they started to cost less. By the 193 0s, colored light bulbs were everywhere.Today millions of light sets are sold in each year. They light 80 million homes. Some of them are now used for other holid ays too. They are used on Halloween and Valentine's Day. Bu t it all started with Johnson's Christmas tree.28. What do we know about Edward Hibberd Johnson?A. he came up with the idea for Christmas tree lightsB. he employed Thomas Edison to invent the light bulb.C. he adovacated setting up a Christmas tree in .D. he built up a company to provide electricity for many home s.29. Johnson used colored light bulbs to replace tree candles mainly to_______.A. develop a new traditionB. make a Christmas tree saf erC. to make Christmas popularD. to attract people to his c ompany30. Why didn’t people decorate their Christmas trees with light s in the early 1900s?A. The light bulbs were not available on the market.B. They preferred candles to colored light bulbs.C. People didn’t know much about electricity.D. They couldn’t afford to pay for the light bulbs第二节(共5小题,每小题2分,满分10分)A. Discuss the issues at once.B. Accept the need of private space.C. Agree on some basic rules.D. Respect and accept cultural differences.E. Explore together.F. Get to know each other better.G. Share your cleaning work togetherHow to Become Best Friends with Your DormmatesYou have never shared a room with anyone and now you ar e scared and confused. But do you know that student years ar e one of the most exciting and memorable? When I was a stu dent I met lots of great people and my best friend as well. Sha ring a room with absolutely unknown person might be challen ging at first, but it will be a priceless experience in your life. Check out several tips on how to become best friends you’re yo ur dormmates.31. ____________This is the essential rule of any good relationship. Make a li st of the things that are/aren’t allowed to both of you and stick to it. Decide on the studying time, cleaning and visiting hours. Not only will it make your routine easier, but can also help to a void misunderstandings and quarrels. It’s important to talk ab out male guests and overnight visitors. If needed, you may set some rules for your visitors. When I was a student, our room was frequently full of friends and visitors, but I tried not to turn it into the social center.32. ____________You will escape many fights if you start talking about the pro blem once you feel it’s necessary. When you accumulate the l ittle things, they grow bigger and chances are you will say a lo t of unpleasant things you don’t really mean. Your dormmates simply cannot know or notice some things. That’s why negoti ations are always the right thing to consider. My dormmate wa s always forgetting to take away her wet towel from the dress er and it was just unbearable. When she performed the same thing for several times, I explained that it was a bit irritating an d an annoying bad habit. That’s it.33. ___________Common memories and experience are the right things that pull people together. You are newcomers and you have no id ea about the territory of the campus. So why not explore the c ampus together? Generally speaking, any activity you can sh are will be of advantage. You can become workout buddies or you may turn out to be the fans of the same band.34. ____________I really appreciate togetherness and I was always a good mi xer, but sometimes even such an easy going person like me n eeds some personal space and me-time. You spend every minute together and you need to take a break once in a while. It’s absolutely okay. Discuss this que stion with your dormmates well in advance so that you won’t h ave any problems during the school year.35. ____________This tip will help you to get along with the dormmate and will help you go far in life as well. Your dormmates may be from o ther countries with different traditions, religion and views. Be c areful with the stereotypes and prejudgment, your ideas about the subject may be superficial and incorrect. Most probably y our overseas dormmates will need some help during the perio d of adaptation to the new surrounding and life style. Sharinga room with an international student is a unique chance to lea rn another culture and language. Don’t miss it!第三部分语言运用第一节完型填空(共20小题,每小题1.5分,满分30分) Last week I stopped at a red light. To my left stood a young woman. She had a look of 36 on her face, ragged clothes, and a sign that 37 , “Just need a little help. Thank you.” I wa s 38 drawn to her. I had no cash in my 39 . Instead, I gath ered all the change I had in my car. I rolled my 40 down. “H i. What’s your name?” I asked. “Joyce,” she 41 with caution in her voice. “Hi, Joyce, I’m Kelley.” I 42 my arm to give her a handshake. She unwillingly 43 my hand. “It’s nice to mee t you. I wish I had 44 to help you with but this is all I have ri ght now.” She pleasantly 45 her hands and 46 the coins. She started telling me how their house was burned down last year and they 47 everything. With no insurance and both lo sing their jobs, they were starting over.All week I drove by that place hoping to see Joyce and give her more. One week later, I was the first in 48 at the red lig ht and as I 49 the light I smiled. There was Joyce. I asked h er what her 50 were. She said that one of her relatives lived in and 51 a few rental houses, and she had agreed to let them stay in one until they got 52 . “I have a little something t o help you 53 there,” and I gave her a 20-dollar bill. “We all need a little help every now and then, don’t we?” We both smiled and nodded in 54 .Who knows if I’ll ever see her again? But I know at that mome nt she smiled and she knew that things really were going to g et better for her. And seeing her smile and the hope in her ey es is what I needed to 55 my trouble in life.36. A. pride B. satisfaction C. sadness D. puzzle37. A. told B. read C. wrote D. showed38. A. luckily B. generally C. slowly D. naturally39. A. wallet B. home C. office D. car40. A. door B. window C. curtains D. sleeves41. A. explained B. argued C. respondedD. repeated42. A. put away B. put up C. put out D. put aside43. A. folded B. raised C. pressed D. shook44. A. less B. more C. fewer D. most45. A. raised B. gave C. reached D. cupped46. A. accepted B. spread C. collected D. threw47. A. got B. lost C. sold D. missed48. A. fact B. time C. turn D. line49. A. approached B. left C. discovered D. broke50. A. beliefs B. dreams C. plans D. projects51. A. built B. chose C. sold D. owned52. A. truth B. jobs C. benefits D. support53. A. get B. escape C. pass D. survive54. A. agreement B. doubt C. demand D. surprise55. A. run into B. hold back C. get throughD. put off语法填空(共10小题,每小题1.5分,满分15分)(一)阅读下面材料,在空格处填入适当的词(一个)或者用所给词的适当形式填空My name is Billy Smith. I’m 50 years old this year. I tipped the scales at 32 stone two years ago. 56. ___________(lucky), I m anaged to lose weight.I began to gain weight when my mom developed Parkinson’s disease in 1992. I soon became her caregiver, and continued to provide her 57.____________ care for over 10 years. But wh en the pressure of taking care of my mother and 58._________ _____(keep) my job got too much for me, I began to skip meal s and feed on fast food. I gained weight quickly.My huge weight gain caused me to develop high blood pressu re. I also had 59. ___________(difficult) in breathing at times. I n 2014 I went to see my doctor, 60. ___________ told me that I would die within two years if I didn’t lose weight. I didn’t want to die. I wanted to see my young son grow up, and I knew 61. __________ was time to change.I started to eat healthy food and work out in the gym. Finally, I62. __________ (succeed) in losing weight. Now I weigh just 1 9 stone. I had never been to my son’s parents’ evenings beca use I was so ashamed and scared 63. _____________ my wei ght would lead to him being bullied. Now, 64. __________(look ) normal, I can do the things I have never been able to do, but should 65. __________ as his father.(二)单句语法填空(共10小题,每小题1分,满分10分)66. Yuan Longping gives millions of yuan to equip others ____ ____ their research in agriculture.Not _______ Charlie’s own life was easy! In fact, he had a terri ble childhood himself.When Darlene Coulon came _________(dash) through the doo r, she recognized Tony and shook hands with him.___________(open) in 1987, Futuroscope is one of the largest space-age parks in the world.In the 19th century, Cholera was the deadly disease of ______ _ day.They often change the kind of crop in each field __________ fe w years, for example, growing corn or wheat and then the nex t year peas or soybeans.With all these attractions, no __________ tourism is increasing wherever there is a Disneyland.Smile does not always mean that we are _________(true) hap py.Charlie Chaplin ___________(bright) the lives of Americans an d the British through two world wars and the hard years in bet ween.Copernicus’ theory is now the basis on _________ all our idea s of the universe are built.选词填空(共10小题,每小题1分,满分10分)用所给词或词组的适当形式填空(有两个为多余项)preserve in particular be modeled after contribute defeat cut off apart from struggle focus on more than make sensebe likely toIn winter, the small town is often ____________ by heavy snow storms.Studies show that people _______________ suffer back proble ms if they always sit before computer screens for long hours. It was a really good concert and I enjoy the last song sung by Joy Chou ______________.These traditional customs in my hometown should be _______ _________ and passed on to the younger generations.The woman is respected by people for ______________ agains t cancer bravely for years._______________ the injuries to his face and hands, he broke both legs.If you tell your father what you have done, he will be ________ _______ a little angry.It doesn’t ______________ to buy that expensive coat when th ese cheaper ones are just as good.Many people donated money to the poor boy, which ________ ____ to his returning to school.The doctors are working hard ______________ King cholera.第四部分写作(共1题,满分20分)假定你是李华,原定周六上午的烧烤取消, 改为下午去烤鸭博物馆(the Roast Duck Museum)。

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2016-2017 下学期高一第一次月考尖子班英语试题第一部分: 阅读理解(共两节,满分40分)AHere we explore American folk music, the music of the people."Good Night Irene," is an example of a traditional folk song. That means the song is so old, no one really knows who wrote it. Huddie Ledbetter, the singer and guitarist known as Ledbelly, first recorded "Good Night Irene" in nineteen thirty-two. Since then more than a hundred other versions have been recorded. "Good Night Irene," was a huge hit for the Weavers in 1950.Folk songs sometimes tell stories about real events. An example is the story of a young man whose last name was spelled D-U-L-A but pronounced "Dooley."The story was retold in poems and songs -- including the hit song, "Tom Dooley," recorded in nineteen fifty-eight by the Kingston Trio.Folk singer and songwriter Amy Speace says the history of American folk music can be imagined as a tree with many branches. At the center, she says, is Woody Guthrie.Woody Guthrie wrote almost three thousand songs. But he only recorded about three hundred of them. His granddaughter Anna Canoni says that was partly because he did not have enough money to record more. He made only one record with a major record company.A new kind of folk music mixes elements of traditional folk and rock with mostly acoustic instruments. Some call it "freak folk." Others hate that name.Whatever you call it, one artist often used as an example is the singer, songwriter and harp player Joanna Newsom.Some people probably think of a folk singer as a fossil from the nineteen sixties. A long-haired, guitar-playing idealist who sings about bringing the world together.1.Who wrote “ Good Night Irene”?A. Huddie LedbetterB.The WeaversC. Tom DooleyD.Unknown2.W hat can we learn about Woody Guthrie from Para 4?A. He earned a lot by writing folk music.B. He played an important role in folk music.C. He recorded his songs with a major record company.D. He recorded as many as 3,000 songs in his life.3.According to Para 5, Joanna Newsom____________.A. is a traditional folk singerB.stands for a new kind of folk musicC.has a gift for writing folk musicD.hates the name “freak folk”4.What is the author’s attitude toward folk artists?A.He/She agrees with them.B. He/She doubts them.C. He/She argues against them.D. He/She hesitates to accept them.BLow-Cost Gifts for Mother's DayGift No. 1Offer to be your mother's health friend. Promise to be there for any and all doctor's visits whether a disease or a regular medical check-up. Most mothers always say "no need," another set of eyes and ears is always a good idea at a doctor's visit. The best part ? This one is free. Gift No. 2Help your mother organize all of her medical records, which include the test results and medical information. Put them all in one place. Be sure to make a list of all of her medicines and what times she takes them. "Having all this information in one place could end up saving your mother's life," Dr. Marie Savard said.Gift No. 3Enough sleep is connected to general health conditions. "Buy your mother cotton sheets and comfortable pillows to encourage better sleep," Savard said. "We know that good sleep is very important to our health."Gift No. 4Some gift companies such as Presents for Purpose allow you to pay it forward this Mother's Day by picking gifts in which 10 percent of the price you pay goes to a charity (慈善机构). Gift givers can choose from a wide variety of useful but inexpensive things —— many of which are "green" —— and then choose a meaningful charity from a list. When your mother gets the gift, she will be told that she has helped the chosen charity.5. What are you advised to do for your mother at doctor's visits?A. Take notesB. Buy medicineC. Give her giftsD. Be with her6.. Where can you find a gift idea to improve your mother’s sleep?A. In Gift No. 3.B. In Gift No. 1.C. In Gift No. 2.D. In Gift No. 4.7.. Buying gifts from Presents for Purpose allows mothers to_____A. enjoy good sleepB. be well-organizedC. give others helpD. get extra supportCAfter a terrible electrical accident, which caused him to become both blind and deaf, the whole world became completely dark and quiet for Robert Edwards for almost ten years. The loss of sight and hearing threw him into such sorrow that he tried a few times to put an end to his life. His family, especially his wife, did their best to tend and comfort him and finally he regained the will to live.One hot summer afternoon, he was taking a walk with a stick near his house when a thunderstorm started all at once. He stood under a large tree to avoid (避免)getting wet, but he was struck by the lightning. Witnesses(目击者) thought he was dead but he woke up some 20 minutes later lying face down in muddy water at the base of the tree. He was trembling badly, but when he opened his eyes, he could hardly believe what he saw: a plough and a wall. When Mrs. Edwards came running up to him, shouting to their neighbors to call for help, he could see her and hear her voice for the first time in nearly ten years.The news of Robert regaining his sight and hearing quickly spread, and many doctors came to examine him. Most of them said that he regained his sight and hearing from the shock he got from the lightning. However, none of them could give a convincing answer as to why this should have happened. The only reasonable explanation given by one doctor was that, since Robert lost his sight and hearing as a result of a sudden shock, perhaps, the only way for him to regain them was by another sudden shock.8.The reason for Robert’s attempts to kill himself was that _________.A. a terrible traffic accident happened to himB. he had to live in a dark and silent worldC. he was struck by the lightning once moreD. nobody in the world cared about him9.What was Robert doing when he was struck by the lightning?A. Sheltering from the rain under a tree.B. Driving a car.C. Taking a walk with a stick.D. Lying on the ground.10.We can infer from the text that ________.A. there was no accurate explanation for Robert’s recoveryB. many doctors came because Robert was badly injuredC. Robert’s wife sent for doctors immediately after the shockD. a sudden injury in the head led to Robert’s recovery11.What’s the best title of the whole passage?A. A Terrible Electrical AccidentB. Robert Edwards and His WifeC. What a Sudden ShockD. An Unforgettable ExperienceDEndangered mountain gorillas(大猩猩) are close biological cousins to humans. Over thepast decade,people have made more efforts to help their fellow primates. And now,theresults are proving to be positive.According to new information given by the Uganda WildlifeAuthority and the World Wild Fund for Nature(WWF),the total world population of mountaingorillas has risen in the last two years.While mountain gorillas remain an endangered species,this increase is largely due to the actions of conservationists(保护工作者).“Mountain gorillasare the only great ape experiencing a population increase,”said David Greer,the WWF’sAfrican Great Ape Program Manager.“This is largely due to strong conservation efforts andsuccessful community work.”Strength in NumbersIn 2000,the total population of mountain gorillas was only 320.The low number was aresult of illegal hunting,habitat loss,and disease.Since then,the number has risen,butslowly.Mountain gorillas live in Rwanda,Uganda,and Democratic Republic of Congo—allcountries in central Africa.To ensure more protection and care,nearly half of the existingpopulation lives in a national park.Bwindi Impenetrable National Park,located in the northernpart of Rwanda,is home to 400 mountain gorillas.They have formed 36 social groups and areled by 16 male gorillas.Ten of these groups have become used to human’s research and tourism.Family TiesMountain gorillas are highly social creatures that live in a communityenvironment.Typically,mountain gorillas live in a group of about 30 individuals.The leader isan older male who organises the group for hunting and nesting.This male can weigh up to 500pounds and stand nearly 6 feet tall.Often he will have silver hair on his back,marking hissenior age and dominance(优势) within the group.Like any community,gorillas depend onone another.Now,they are depending on humans to help keep them alive.12.The number of mountain gorillas is increasing mainly because of________.A.fewer and fewer forests being cut by people B.the strict laws for huntingC.constantly changeable habitats D.the efforts of conservationists13.Now mountain gorillas mainly live________.A.on the bare mountains B.in national parksC.in some personal homes D.in some forests14.We can infer from the last paragraph that________.A.individual mountain gorillas can live without depending on othersB.the young male mountain gorillas are in charge of the organisationC.the weight and height are very important for the male leader of mountain gorillasD.the grey hair on the head of the leader stands for his senior age15.What’s the purpose of the passage?A.To introduce the lifestyle of mountain gorillas.B.To tell the relationship between mountain gorillas and humans.C.To call on us human beings to help protect mountain gorillas.D.To warn us the extinction of mountain gorillas.EAs we know, everyone ca n make mistakes, but don’t worry about it. The following is what we should do when we make mistakes.• Just admit (承认)it. Don’t think that our mistakes are caused by others. 16 Don’t blame other people, and don’t cheat ourselves, either.• 17 In order to stop the problem from getting worse, we should act quickly to solve it. If we don’t act and deal with the problem quickly, it’ll only make us feel more stressed. Also it is necessary to make a plan of action and correct the mistake according to it. 18 .• 19 . Those who have made the most mistakes can get an A, for they are the ones who have learned the most. The more we learn from our mistakes, the cleverer we are.• 20 . What caused us to make the mistake? How can we avoid making the same mistake in the future? When we act with a method to get a good result, do it that way next time. If we don’t, we should stop, think about it, change it and try again.A.Realize that making mistakes is the best way to learn.B. Don’t be afraid of failure.C. Be brave and face the fact that we have made the mistakes.D. Solve it at once.E. So be away from stress.F. So decide quickly and act.G. Think about what we can learn from our mistakes.第二部分:完形填空(共20小题;每小题1.5分,满分30分)My wife and I moved into our home two years ago. We had a yard with a lot of 21 .V ery often when we have flowers, Denise or I would plant some between the rocks, just to add some 22 to the area.Last summer, I found a tiny little 23 in the yard that I could not immediately identify.I knew I didn’t plant it and Denise said she didn’t either. We decided to let it 24 growing until we could find out what it was.Weeks passed and as I made my way back to the 25 plant, it appeared to be a sunflower. I decided to 26 the weeds around it. As I pulled rocks from the area to get to the weeds, I noticed something 27 . The sunflower had not 28 where I saw it begin. It actually had begun under a big 29 and grown under and around it to reach the 30 .That’s when I 31 that if a tiny little sunflower didn’t let a big rock stand in its 32 of developing, we too have the ability of doing the same thing. If we 33 ourselves like that little sunflower, we can reach where we 34 to go and get what we need for growth.We need to believe in ourselves knowing we have the 35 to achieve our goals. Like the 36 , it knew it had the ability to get over the rocks because it had 37 in itself that it would succeed. Stand tall like the sunflower and be 38 who and what we are, then the environment will begin to 39 us. We will find a way to go under or 40 any “rocks”in order to reach our goals.21.A. flowers B. insects C. rocks D. vegetables22.A. color B. water C. fertilizer D. shape23.A. weed B. seed C. rock D. plant24.A. stop B. continue C. improve D. escape25.A. weak B. lonely C. strange D. pretty26.A. remove B. tend C. watch D. collect27.A. wonderful B. terrible C. valuable D. unusual28.A. passed B. started C. left D. died29.A. tree B. table C. rock D. wall30.A. air B. top C. sun D. house31.A. realized B. doubted C. regretted D. hoped32.A. place B. way C. course D. process33.A. fill in B. put in C. worry about D. believe in34.A. forget B. hate C. aim D. wait35.A. ability B. wish C. plan D. idea36.A. yard B. sunflower C. home D. summer37.A. energy B. virtue C. courage D. faith38.A. aware of B. afraid of C. proud of D. tired of39.A. support B. affect C. upset D. forgive40.A. into B. around C. through D. from第三部分:语法填空(15分)Animals have been killed for their fur and feathers, and 41. (thousand)of kinds of animals have disappeared from the world forever. About 170 kinds in the US alone42. (consider) in danger.Why should people care? 43. we need animals, and if they are gone,there will never be any more. Every animal has its place in the balance of nature . 44.(destroy) one kind of animal can create many problems. For example, when farmers killed large numbers of hawks (老鹰), the farmers’ stores of corn and grain were destroyed 45. rats and mice. With no hawks to keep down their numbers,the rats and mice multiplied (繁殖) 46. (quick).Luckily, some people are working 47. (help) save the animals. Somegroups raise money to let people know about 48. problem. And they try to getthe governments to pass laws protecting animals in danger. Quite a few49. (country) have passed laws. These laws forbid the killing of anyanimals on the danger list . Slowly, the number of some animals in danger50. (be) growing.第四部分:短文改错(共10小题;每小题1分,满分10分)Dear Sir,Thank you for invite me to the summer English course in your school. As for yourchoice between the two courses, I prefer the four-week course because of this will allow memore time to do some traveling but make a few new friends. Of all the subject I’m learning atschool, I like English best. I had been learning English for eleven years but my spoken Englishrema ins poorly. So I really hope to take this chance improve it. If possible, I’d like to stay witha family for a couple of days in order which I can know some customs in England, which I’m particularly interesting in. I believe I will have a wonderful time this summer.Yours truly, Li Hua五.书面表达(25分)假如你是荣光中学的学生李华,你偶然看到在你市求学的美国学生Tom在网上发帖,要大家给他推荐一本学习汉语的书。

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