人教新目标版七年级英语上册Unit 9 My favorite subject is science复习训练有答案

人教新目标版七年级英语上册Unit 9 My favorite subject is science复习训练有答案单元语法单项填空1. _ is your favorite actor?Jet Li.A. What B. When C. Who D. Where2. _ is three and four?Its seven.A. When B. Which C. How D. What3. _ is the math exam? Its on Friday.A. When B. What C. How D. Why4. _ sport does he like best?Football.A. What B. Who C. How D. Why5. _ do you like geography?Because its fun.A. Why B. Who C. What D. How单元情景交际补全对话A. Yes, I like it very much.B. Who is your math teacher?C. Why do you like it?D. How are you?E. Whats your favorite subject?Bob: Hey, Joe! 1Joe: Im OK, thanks. A nd you?Bob: Im fine, too. Can I ask you some questions?Joe: Sure. You can ask anything you like.Bob: Do you like the food in our school din ing hall (食堂)?Joe: 2Bob: 3Joe: My favorite subject is math.Bob: 4Joe: Because its very interesting.Bob: 5Joe: My math teacher is Mr. Brown.Bob: Wow! He is a ve ry good teacher!1. _ 2. _ 3. _ 4. _ 5. _能力提升完形填空Dear friend,I am 1 school girl. My name is Alice Green. I am t welve. I 2 two brothers. My brothers and I 3 all at school. We go to school 4 Monday 5 Friday. We 6 have classes 7 Saturday and Sunday. My father and mother are teachers. They say China is great.I like 8 . I read a book about Chinese stories. Those stories are very interesting. I also like playing soccer and basketball with my brothers. 9 do you like? Lets 10 friends.Please write back soon.Alice1. A. an B. a C. the D. /2. A. has B. do C. have D. am3. A. i s B. am C. be D. are4. A. in B. at C. on D. from5. A. to B. on C. in D. for6. A. arent B. isnt C. dont D. doesnt7. A. on B. at C. in D. to8. A. read B. draw ing C. reading D. draw9. A. How B. When C. What D. Where10. A. are B. is C. do D. be阅读理解Week Time Monday Tuesday Wednesday Thursday Friday9: 10 Math Chinese Math Math English10:30 Geography History Geography Music Math11: 15 Chinese Art Chinese Music Math1:45 Science Music Science Chinese Science3:00 Computer English P. E. Geography Art1. How many subjects do they have?A. Seven. B. Eight. C. Nine. D. Ten.2. What lesson do they have at 1:45 on Wednesday?A. Science. B. Geography.C. Hist ory. D. Math.3. On Frida y, math begins at _.A. 9:10 B. 10:30C. 1:45 D. 3:004. On Tuesday morning, students dont have _.A. Chinese B. historyC. art D. music5. Do they have a lesson at 10:30 on Thursday?A. Yes, t hey do.B. No, they dont.C. They have an English lesson.D. We dont know. 参考答案语法1-5 CDAAA情景 1-5 DAECB完形 1-5 BCDDA 6-10 CACCD三角形综合检测有解析（2019年中考数学一轮复习）单元综合检测四三角形(80分钟120分)一、选择题(每小题4分,满分32分)1.如图,直线ab,1=50,2=28,则3的度数是 (A) A.22 B.28C.50 D.30【解析】如图,ab,4=1=50,由三角形的外角性质得3=4-2=50-28=22. 2.在ABC中,ABC=30,AB边长为10,AC边的长度可以在3,5,7,9,11中取值,满足这些条件的互不全等的三角形的个数是 (D)A.3 B.4 C.5 D.6 【解析】如图,过点A作ADBC于点D,ABC=30,AB=10,AD= AB=5.当AC=3时,没有符合条件的三角形;当AC=5时,可作1个三角形;当AC=7时,可作2个三角形;当AC=9时,可作2个三角形;当AC=11时,可作1个三角形.所以满足条件的互不全等的三角形共有1+2+2+1=6个.3.若一个角的补角比它余角的4倍还多15,则这个角的度数是 (C)A.45 B.55 C.65 D.75【解析】设这个角的度数是x,根据题意得180-x=4(90-x)+15,解得x=65.4.如图,BCEF,ACDF,添加下列一个条件,仍不能判断ABCDEF的是 (B) A.AD=BE B.C=FC.AC=DF D.BC=EF【解析】BCEF,ACDF,ABC=DEF,BAC=EDF,根据全等三角形的判定方法,添加选项B中的C=F,不能判断ABCDEF.5.如图,四边形ABCD和ABCD是以点O为位似中心的位似图形,若OAOA=23,则四边形ABCD和ABCD的面积比为 (A) A.49 B.25C.23 D. 【解析】四边形ABCD和ABCD的相似比为23,所以四边形ABCD和ABCD的面积比为49.6.点D,E分别在等边ABC的边BC,AC上,BD=CE,AD与BE相交于点O,则AOE的度数是 (C) A.30 B.45 C.60 D.75【解析】由等边ABC得ABC=60,易证ABDBCE,得BAD=CBE,AOE=BAD+ABE=CBE+ABE=60. 7.如图,已知ABC中,ACB=90,AC=BC=2,将直角边AC绕点A逆时针旋转至AC,连接BC,E为BC的中点,连接CE,则CE的最大值为 (B)A. B. +1C. +1 D. +1【解析】取AB的中点M,连接CM,EM,当CE=CM+EM时,CE的值最大,将直角边AC绕点A逆时针旋转至AC,AC=AC=2,E为BC的中点,EM= AC=1,ACB=90,AC=BC=2,AB=2 ,CM= AB= ,CM+EM= +1.8.如图,在ABC中,ACB=90,AC=BC,O是AB的中点,D,E分别是边AC,BC上的动点.下列结论:若DOE=90,则四边形CDOE的面积是定值;若AD=CE,则DOE=90;若DOE=45,则AOD与BEO相似;若AOD与BEO相似,则DOE=45.其中正确的是 (C) A. B. C. D.【解析】连接OC.AC=BC,O是AB的中点,OCAB,ACB=90,OC=AO=BO,A=ACO=BCO=B=45.DOE=90,AOD=COE,AODCOE,S四边形CDOE=SCOE+SCOD=SAOD+SCOD=SAOC= SABC,即四边形CDOE的面积是定值,故正确;AD=CE,易证AODCOE,由OCAB可得DOE=90,故正确;DOE=45,AOD+BOE=135,AOD+ADO=135,BOE=ADO,A=B,AODBEO,故正确;AOD与BEO相似分两种情况:AODBEO或AODBOE,故不正确.二、填空题(每小题5分,满分15分)9.如图,AB=AC,AB的垂直平分线ED交AC于点D,若CBD=30,则A的度数为40. 【解析】设A的度数为x,ED垂直平分AB,AD=BD,A=ABD=x,又AB=AC,ACB=ABC=x+30,根据题意得x+2(x+30)=180,解得x=40,即A=40.10.如图,在平行四边形ABCD中,E是AD边上的一点,连接BE并延长,交CD的延长线于点F,若AEED=21且平行四边形ABCD的面积为24,则DEF的面积是2. 【解析】EDAE=12,ABCD,DEFAEB, ,ADBC,AD=BC,DEFCBF, , ,SAEB=4SDEF,S四边形BCDE=8SDEF,4SDEF+8SDEF=24,解得SDEF=2.11.如图,D,E分别是ABC的边BC和AB上的点,ABD与ACD的周长相等,CAE与CBE的周长相等.设BC=a,AC=b,AB=c,给出以下几个结论: 如果AD是BC边中线,那么CE是AB边中线;AE的长度为 ;BD的长度为 ;若BAC=90,ABC的面积为S,则S=AEBD.其中正确的结论是.(将正确结论的序号都填上) 【解析】当AD是BC边中线时,则BD=CD,ABD与ACD的周长相等,AB=AC,但此时不能得出AC=BC,即不能得出CE是AB的中线,故不正确;ABD与ACD的周长相等,BC=a,AC=b,AB=c,AB+BD+AD=AC+CD+AD,AB+BD=AC+CD,AB+BD+CD+AC=a+b+c,AB+BD=AC+CD= ,BD= -c= ,同理AE= ,故正确;当BAC=90时,则b2+c2=a2,AEBD= a+(c-b)a-(c-b)= a2-(c-b)2= a2-(c2+b2-2bc)= 2bc= bc=S,故正确.三、解答题(满分73分)12.(8分)计算:sin2 45+3tan 30-3tan 60cos 30.解:原式= +3 -3 = =-4+ .13.(12分)如图1,直线l上有两个点A,B,图中有 =1条线段;如图2,直线l上有三个点A,B,C,图中有 =3条线段;如图3,直线l上有四个点A,B,C,D,图中有 =6条线段;. (1)图4中有多少条线段?(2)猜想:若直线l上有n个不同的点,则图中有条线段.(用含n的代数式表示) (3)应用:春节期间,10位朋友之间互通电话问候,且每两位朋友之间只通一次电话,则这10位朋友之间需通多少次电话?解:(1) =10(条).(2) .(3)当n=10时, =45(次).这10位朋友之间需通45次电话.14.(12分)如图,在ABC中,AB=AC,AD为BC边上的中线,DEAB于点E.(1)求证:BDECAD.(2)若AB=13,BC=10,求线段DE的长. 解:(1)AB=AC,BD=CD,ADBC,B=C,DEAB,DEB=ADC,BDECAD.(2)AB=AC,BD=CD,ADBC,在RtADB中,AD= =12, ADBD= ABDE,DE= .15.(13分)男生女生向前冲是安徽卫视重磅推出的大型户外竞技类真人秀节目,一经推出就受到全国电视观众的青睐.体育爱好者小张站在200米高的楼房(CD)的顶端C处测得冲关赛道“亚洲一号”的起点A的俯角是45,测得终点B的俯角是30.(1)求冲关赛道“亚洲一号”AB的长度.(结果保留根号)(2)预计冲关时间在60秒之内(含60秒)即可夺得2018年冲关王.小张在保证不落水的前提下,要想夺得2018年冲关王,他冲关的平均速度至少是多少米/秒?(结果精确到0.1,参考数据: 1.41, 1.73) 解:(1)在RtACD中,tan 45= ,AD=CD=200.在RtBCD中,tan 30= ,BD= =200 .AB=BD-AD=(200 -200)米.答:冲关赛道“亚洲一号”AB的长度为(200 -200)米.(2)设小张冲关的平均速度为x米/秒,根据题意,得60x200 -200,解得x2.4.答:小张要想夺得2018年冲关王,他冲关的平均速