人教新目标版七年级英语上册Unit 7 How much are these socks复习训练带答案

人教新目标版七年级英语上册Unit 7 How much are these socks复习训练带答案单元语法. 句型转换1. These shorts are $60. (就画线部分提问)_ _ _ these shorts?2. This bag is big. (改为复数形式)_ _ _ big.3. Whats the price of this skirt?(改为同义句)_ _ _ this skirt?4. Can I buy a dictionary from you? (改为同义句)Can you _ a dictionary _ me?5. Can I help you?(改为同义句)_ _ _ _ for you?. 单项填空6. _ is the blue hat?Its eight dollars.A. How B. How much C. What D. Where7. How much _ these brown shoes?29 dollars.A. is B. are C. do D. does8. This pair of socks _ 5 yuan.A. is B. are C. has D. have9. We have sweaters _ red and yellow _ 28 dollars.A. at; to B. in; for C. on; in D. at; for10. I need _ a pair of shoes for school.A. buys B. to buy C. sells D. sell. 用适当的介词填空11. I need a sweater in white _ school.12. How _ these red T-shirts?13. We can buy some nice vegetables _ sale _ very good prices in that supermarket.14. The price _ the car is $ 500,000.15. The boy _ black is my friend.16. The blue socks are only three dollars _ two pairs.17. Volleyball is difficult _ me.18. Sally asks the volleyball star _ his eating habits.19. This pair _ trousers looks so cool.20. The T-shirts _ boys are only $ 5.单元情景交际补全对话A. Oh, its small.B. OK. Ill take it.C. Yes, please.D. Blue and yellow.E. How much is it?S=Shop assistant (售货员) L=LisaS: Can I help you?L: 1 I want a skirt.S: What color do you like?L: 2S: What about this blue one? Its nice.L: Can I try it on (试穿)?S: Sure.L: 3S: What about the yellow one? Its big.L: Hmm. Its good. 4S: Its $39.L: 51. _ 2. _ 3. _ 4. _ 5. _能力提升完形填空Hello! I am Cindy. Today is Sunday. I 1 to Sunshine Clothes Store. The clothes in it 2 on sale. So I want to buy some clothes 3 my grandparents and my parents. Let 4 have a look. The brown jacket is at a very good 5 for only 27 dollars. I think my grandfather will like it. For my grandmother I want to buy those black 6 . They are comfortable (舒服的). 7 about this blue sweater? Oh, it looks 8 . My father needs it. And they have socks 9 all colors. I know my mother 10 purple very much. So I will buy the purple ones. For me, I choose a bag for sports.1. A. sell B. come C. help D. see2. A. am B. is C. are D. be3. A. for B. at C. on D. with4. A. I B. my C. me D. mine5. A. color B. size C. dollar D. price6. A. shoes B. hat C. sweater D. T-shirt7. A. How B. Whats C. Where D. Hows8. A. well B. good C. interesting D. boring9. A. on B. at C. for D. in10. A. likes B. plays C. like D. play阅读理解AZig Zags Clothes StoreClothes Colors Pricesshorts white, blue $6trousers black, green $ 11sweaters yellow, red $ 15skirts pink, orange $8T-shirts white, green $ 10socks white, purple $1根据表格内容，判断正(T)误(F)。1. Two pairs of trousers are twenty-two dollars. ( )2. You can buy yellow T-shirts at Zig Zags Clothes Store. ( )3. You like blue and you only have seven dollars. You can buy shorts. ( )4. One sweater and two T-shirts are thirty dollars. ( )5. You can buy a pair of socks, a skirt and a sweater with nineteen dollars. ( )BOne Sunday afternoon, Mr. Green and his child (孩子), Mary, are in a big shop. Mr. Green wants to buy a new skirt for her. Mary doesnt like the new skirt. She likes something to eat. So her father buys two kilos of apples for her. Mary also wants to buy some picture books and colored pencils. There are many things and many people in the shop. They are men and women, old and young. They all want to buy something there. The people in the shop are very friendly (友好的).6. It is _.A. Saturday B. Monday C. Friday D. Sunday7. Mary and _ are in the shop.A. Mrs. Green B. his fatherC. her father D. her mother8. Mary wants to buy _.A. a new dressB. colored booksC. picture books and colored pencilsD. something to drink9. What does Mr. Green want to buy for Mary?A. A new skirt. B. An old skirt. C. A new bike. D. An old bike.10. The people in the shop are very _.A. bad B. friendC. friendly D. old 参考答案语法1. How much are 2. These bags are 3. How much is 4. sell, to 5. What can I do6. B 7. B 8. A 9. B 10. B 11. for 12. about 13. on, at 14. of 15. in 16. for 17. for 18. about 19. of 20. for情景 CDAEB完形 1. B 2. C 3. A 4. C 5. D 6. A 7. A 8. B 9. D IO. A 阅读 1. T 2. F 3. T 4. F 5. F 6. D 7. C 8. C 9. A 10. C 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R