2019年初中毕业生第一次模拟考试
参
(仅供参考,如有错误,请自行更正。)
一、听力理解。(本大题分为A、B、C、D四部分,共30小题,每小题1分,共30分。) 1-5 ABCAC 6-10 CCBAA 11-15 BBABC 16-20 BABCC 21-25 BACBC 26. stars 27. Friday 28. first 29. scientist 30. news
• 单项填空。(本小题有15小题,每小题1分,共15分。) 31-35 CBACD 36-40 CBDCD 41-45 BDACA
• 完形填空。(本大题有10小题,每小题1分,共10分。) 46-50 ADCBB 51-55 BDAAD
• 阅读理解。(本大题有15小题,每小题2分,共30分。) 56-60 BDADC 61-65 ACADB 66-70 FEDAB
• 短文填空。(本大题有10小题,每小题1.5分,共15分。)
• bookstore 72. opened/appeared 73. sells 74. readers/people 75. on/in/for/of 76. popular 77. number 78. going/planning/ready 79. But 80. more 六、读写综合。(本大题分为A、B两部分,共20分。) A) 信息归纳。(本题有5小题,每小题1分,共5分。) 81. about 6/six hours 82. more than/over 2000 83. Li Yan
84. (an) education scientist
85. (to) stop helping kids with their homework
• 书面表达。(本题15分。)
Possible versions: A
According to the report, many parents help kids with their homework. I have had such experience too. One night, my father sat down beside me and tried to help me study for the test. Then he found I had made so many mistakes in my math homework, he got rather angry and shouted at me angrily. I was so frightened that I just kept crying. Of course, I couldn't put my heart into my study again that night.
I think there's no need for parents to do so. It will make parents tired and even fight with their kids. I think we should learn to deal with problems by ourselves instead of depending on our parents. This is good for our future.
B
According to the report, many parents help kids with their homework. I have had such experience too. Last Tuesday evening, when I was studying for my math test, I had many problems that I couldn’t work out. So I asked my father for help. Thanks to my father’s help, I got a good grade in the math test.
I think it’s good to let my parents help with my homework. First, my parents can know more about my study when they help me. Second, it’s also a good chance for me to communicate with them. Although they’re tired after work, they are patient and willing to help me.
Of course, we should learn to deal with problems by ourselves instead of depending on our parents. This is good for our future.
2019年初中毕业生第二次模拟考试
(数学试题参及评分说明)
一、选择题(本大题10小题,每小题3分,共30分):在每小题列出的四个选项中,只有一个是正确的,请把答题卡上对应题目所选的选项涂黑. 题号 答案 1 2 3 4 5 6 7 8 9 10 D C C B A D C C D C
二、填空题(本大题6小题,每小题4分,共24分):请将下列各题的正确答案填写在答题卡相应的位置上.
11.x(x-2); 12.4; 13.;
14.17; 15.; 16.16
三、解答题(一)(本大题3小题,每小题6分,共18分) 17.解:原式=
, .......(4分)
=. .......(6分)
18.解:由①,得. .......(2分)
由②,得,
. .......(4分)
∴原不等式组的解集是
19.(1)解:如图,直线l为线段AB的垂直平分线; ....(3分)
. .......(6分)
(2)证明:∵直线l为线段AB的垂直平分线,点M,N在直线l上,
∴MA=MB,NA=NB. ∵又MN=MN,
∴△MAN≌△MBN(SSS) .......(5分)
∴∠MAN =∠MBN. .......(6分)
三、解答题(二)(本大题3小题,每小题7分,共21分)
20.解:(1)200; .......(2分)
(2)(人).正确画图如下:
人数 121050 50 12
30
A级 B级 C级 学习态度层
.......(4分)
(3)
.
∴估计该市初中生中大约有17000名学生学习态度达标. .......(7分)
21.解:(1)设B工程队单独完成所有工程需要x天,依题意得:
, .......(2分)
解得x=30.
经检验:x=30是原方程的解.
∴B工程队单独完成所有工程需要30天; ........(4分) (2)设A工程队需要工作y天才能撤出工程,依题意得:
, 解得. .......(6分)
∴A工程队至少需要工作8天才能撤出工程. ........(7分)
22.(1)证明:连接OC .
∵0A=OC, ∴∠OCA=∠OAC.
∵CD⊥PA, ∴∠CDA=90°,即∠CAD+∠DCA=90°.
∵AC平分∠PAE, ∴∠DAC=∠CAO.
∴∠OCA=∠DAC.
∴∠DCO=∠DCA+∠ACO=∠DCA+∠DAC=90°,即OC⊥DC.
又∵OC为⊙O的半径,
∴CD为⊙O的切线; ........(3分)
(2)解:过O作OF⊥AB,垂足为F.
∴∠OCD=∠CDA=∠OFD=90°, ∴四边形OCDF为矩形.
∴OC=FD,OF=CD.
设AD=x,则DC=2DA=2x.
∵⊙O的直径为10, ∴DF=OC=5. ∴AF=5-x. ........(5分)
在Rt△AOF中,由勾股定理得,
即.
F
化简得解得
,
,
(舍去).
从而AD=2, AF=5-2=3.
∵OF⊥AB, ∴AB=2AF=6. ........(7分)
三、解答题(三)(本大题3小题,每小题9分,共27分)
23.解:(1)把A(,0)代入y=x+,得,解得.
同理得. .......(2分)
把(-1,)和(,)分别代入,
得 解得
∴抛物线的解析式为y=-x2+2x+; ........(5分)
(2)∵CD与y轴平行,点E(
∴点C,D的横坐标都为
.
,)在线段CD上,
∴C(,),D(,).
∵点E(,)为线段CD的中点,
, .......(7分)
∴
.
∴当时,的最大值为. ........(9分)
24.(1)证明:如图①,在矩形ABCD中,∠A=∠D=90°,
∴∠ABP+∠APB=90°.
又∵∠BPC=90°, ∴∠APB+∠DPC=90°. ∴∠ABP=∠DPC.
∴△APB∽△DCP ; .......(3分)
解:(2)tan∠PEF的值不变. .......(4分)
理由:如图②,过F作FG⊥AD,垂足为G,则四边形ABFG是矩形.
∴∠A=∠PGF=90°,GF=AB=2. .......(5分)
∴∠AEP+∠APE=90°,
又∵∠EPF=90°, ∴∠APE+∠GPF=90°.
∴∠AEP=∠GPF.
∴△AEP∽△GPF. .......(6分)
∴==2.
在Rt△EPF中,tan∠PEF==2,
∴tan∠PEF的值不变; .......(7分)
(3)线段EF的中点经过的路线长为. .......(9分)
25.解:(1)如图,在菱形ABCD中,对角线AC,BD相交于点O,
且AC=12 ,BD=16 , ∴ BO=DO=8 ,AO=CO=6.
2
2
∴ AB=8+6=10(cm); ...............(2分)
(2)∵四边形ABCD是菱形, ∴AB∥CD,∠ADB=∠CDB.
又∵PF∥AD, ∴四边形APFD为平行四边形. ∴DF=AP=tcm. ∵EF⊥BD于点Q,且∠ADB=∠CDB,
∴∠DEF=∠DFE. ∴DE=DF=tcm. ∴AE=(10-t)cm. 当PE∥BD时,△APE∽△ABD. ……………………(4分) APAEt10-t∴=,即=. 解得t=5. ABAD1010
∴当t=5 s时,PE∥BD; ……………………(5分)
•
∵∠FDQ=∠CDO,∠FQD=∠COD=90°,
QFDFQFt3t∴△DFQ∽△DCO . ∴= ,即= . ∴QF=.
OCDC61054t
同理,得QD= .
5
6t
∵DE=DF,DQ⊥EF, ∴EQ=QF. ∴EF=2QF= .…………(7分)
5如图,过点C作CG⊥AB于点G.
1148
∵S菱形ABCD=AB·CG=AC·BD, ∴10CG=×12×16 . 解得CG=.
22548116t4t122
∴S▱APFD=DF·CG=t , S△EFD=EF·QD=××=t .
5225525
48122
∴s=t-t. ……………………………………(9分)
525
整理丨尼克
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