初三周练

于都二中初三数学周练试卷一、填空题1．计算：(3)2-⨯= ． 2．化简：52a a -= ．3．在“We like maths ．”这个句子的所有字母中，字母“e ”出现的频率约为 （结果保留2个有效数字）．4．在Rt ABC △中，90C ∠=°，a b c ，，分别是A B C ∠∠∠，，的对边，若2b a =，则tan A = ．5．在加油站，加油机显示器上显示的某一种油的单价为每升4.75元，总价从0元开始随着加油量的变化而变化，是总价y （元）与加油量x （升）的函数关系式是 ．6．的点的距离最近的整数点所表示的数是 ．7．如图，在ABC △中，点D 是BC 上一点，80BAD ∠=°，AB AD DC ==，则C ∠=度．8．如图，点A B ，是O 上两点，10AB =，点P 是O 上的动点（P 与A B ，不重合），连结AP PB ，，过点O 分别作OE AP ⊥于E ，OF PB ⊥于F ，则EF = ． 9．已知二次函数22y x x m =-++的部分图象如图所示，则关于x 的一元二次方程220x x m -++=的解为 ．10．如图，已知AOB OA OB ∠=，，点E 在OB 边上，四边形AEBF 是矩形．请你只用无刻度的直尺在图中画出AOB ∠的平分线（请保留画图痕迹）．二、选择题11．在某次国际乒乓球单打比赛中，甲、乙两名中国选手进入最后决赛，那么下列事件为必然事件的是（ ） A ．冠军属于中国选手 B ．冠军属于外国选手 C ．冠军属于中国选手甲 D ．冠军属于中国选手乙 12．对于反比例函数2y x=，下列说法不正确．．．的是（ ） A ．点(21)--，在它的图象上B ．它的图象在第一、三象限C ．当0x >时，y 随x 的增大而增大D ．当0x <时，y 随x 的增大而减小13．下列图案中是轴对称图形的是（ ）Ａ． Ｂ． Ｃ． Ｄ． 14n 为（ ）A ．2B ．3C ．4D ．515．桌面上放着1个长方体和1个圆柱体，按如图所示的方式摆放在一起，其左视图是（ ）16．如图，将矩形ABCD 纸片沿对角线BD 折叠，使点C 落在C '处，BC '交AD 于E ，若22.5D B C ∠=°，则在不添加任何辅助线的情况下，图中45°的角（虚线也视为角的边）有（ ） A ．6个 B ．5个 C ．4个 D ．3个三、17．计算：2007(1)12sin 60-+-°． 18．化简：24214a a a +⎛⎫+ ⎪-⎝⎭·2008年北京 2004年雅典 1988年汉城 1980年莫斯科（第15题）A ．B ．Ｃ．Ｄ．BE O （第10题）ACBD80（第7题）（第9题）C Bb（第4题）AP（第8题）E C '22.5（第16题）。

第六周——2023-2024学年人教版数学九年级上册周周练考查范围：24.11.已知AB是半径为2的圆的一条弦，则AB的长不可能是( )A.2B.3C.4D.52.下列语句中正确的是( )A.长度相等的两条弧是等弧B.平分弦的直径垂直于弦C.相等的圆心角所对的弧相等D.直径所在直线是圆的对称轴3.如图，AB是的直径，弦于点E，，则的度数为( )A. B. C. D.4.如图，点A，B，C，D，E在上，，，则( )A.42°B.48°C.21°D.16°5.如图,四边形ABCD内接于,连接OA,OC.若,,则的度数为( )A. B. C. D.6.如图, 所在圆的圆心为点O,EM经过圆心O,于点M, 若,, 则所在圆的半径为( )A. 3B. 4C.D.7.如图, BD是的直径, 弦AC交 BD于点G. 连接OC, 若,, 则的度数为( )A. B. C. D.8.如图，AB为的直径，C，D为上两点，若，则的度数为( )A. B. C. D.9.如图，图中有__________条直径，有__________条弦，以点A为端点的优弧有_______条，劣弧有______条.10.如图，C为弧AB的中点，于点N，于点M，cm，则__________cm.11.如图，在中，，有下列结论①，②；③，④通过旋转能与重合，其中正确的结论有___________（填序号）.12.如图，四边形ABCD是的内接四边形，，，.(1)求的度数；(2)求的度数.答案以及解析1.答案：D解析：因为圆的半径为2，所以直径为4，因为AB是一条弦，所以AB的长应该小于等于4，不可能为5，故选：D.2.答案：D解析：A、能完全重合的两条弧是等弧，所以此选项不符合题意；B、平分弦（非直径）的直径垂直于弦，所以此选项不符合题意；C、在同圆或等圆中，相等的圆心角所对的弧相等，所以此选项不符合题意；D、经过圆心的每一条直线都是圆的对称轴，即直径所在直线是圆的对称轴，所以D 选项正确.故选：D.3.答案：B解析：AB是的直径，弦于点E，，，，，故选：B.4.答案：C解析：点A、B、C、D、E在上，，，，，故选：C.5.答案：D解析:,,,四边形ABCD是圆内接四边形,,,故选D.6.答案：D解析：如图,连接OC, 设所在圆的半径为R,则，，经过圆心O,于点M,，.在中, 由勾股定理得,即, 解得.7.答案：C解析：连接AB,AD,, ,BD是直径, ,, ,即是等腰直角三角形,,.8.答案：B解析：方法一：如图，连接AD，是的直径，，.故选B.方法二：如图，连接OD，则.由圆周角定理得，在等腰三角形DOB中，.故选B.9.答案：1，4，2，2解析：题图中直径只有AB这1条，弦有AC，AB，CD，BC这4条，以点A为端点的优弧有，这2条，劣弧有，这2条.10.答案：2解析：连接OC，根据圆心角、弧、弦之间的关系求出，根据角平分线性质得出，根据垂径定理得出cm，于是cm.11.答案：①②③④解析：在中，，①正确；为公共弧，，②正确，③正确；，，通过旋转能与重合，④正确.12.答案：(1)(2)解析：(1)，，，；(2)由圆周角定理得：，，四边形ABCD是的内接四边形，.。

2025年江西省莲花县初三下学期周练九语文试题请考生注意：1．请用2B铅笔将选择题答案涂填在答题纸相应位置上，请用0．5毫米及以上黑色字迹的钢笔或签字笔将主观题的答案写在答题纸相应的答题区内。

写在试题卷、草稿纸上均无效。

2．答题前，认真阅读答题纸上的《注意事项》，按规定答题。

一、积累与运用1．给下列句子排序，最恰当的一项是( )①当阳光洒在身上时，它更坚定了心中的信念---要开出：一朵鲜艳的花。

②不久，它从泥土里探出了小脑袋，渐渐地，种子变成了嫩芽。

③从此，它变得沉默，只有它知道，它在努力，它在默默地汲取土壤中的养料。

④它经受着黑暗的恐惧，暴雨的侵袭，但是，它依然努力地生长着。

⑤种子在这块土地上的生活并不那么顺利，周围的各种杂草都嘲笑它，排挤它，认为它只是一粒平凡的种子。

A．①⑤②③④B．①③②⑤④C．⑤③④②①D．⑤④②③①2．下列句子组成语段，顺序排列正确的一项是①人在事业上很难一帆风顺，有时甚至会陷入绝境。

②让人，对事业的发展有极大的帮助。

③而让人，则会让你的人生之树在即将枯萎的时候焕发新的生机。

④如果宁折不弯，不退不让，事业很可能会就此终结。

A．①②④③B．④②③①C．②①④③D．②③①④3．下列各句中，加点成语使用恰当的一项是（）A．春节刚过，武大的樱花就开放了，花期仅一个多月，市民们趋之若鹜．．．．。

即使是下雨天，校园内也是人山人海。

B．星期六上午，春光明媚，同学们相约来到西山公园，尽情挥洒自己的青春，共享天伦之乐．．．．。

C．现在许多年轻人对影视明星顶礼膜拜．．．．，做事失去理性，严重影响到正常的生活、学习和工作。

D．我们在学习中只要掌握正确的方法，就会收到事倍功半．．．．的效果。

4．下列句子没有．．语病的一项是（）A．随着《流浪地球》的热映，使更多影迷们开始关注影片的原著到底是什么样的。

B．语文课程要重视民族优秀文化的传承，培育民族文化的认同感。

C．天府仁寿大道的开通拉近了成眉之间的时空距离。

九年级数学周周练一、选择题（每题3分，共24分）1．从正方形的铁片上，截去2cm宽的一条长方形，余下的面积是48cm2，则原来的正方形铁片的面积是（）A．96cm2 B．64cm2 C．54cm2 D．52cm22．直角三角形两直角边和为7，面积为6，则斜边长为（）A．5 B． C．7 D．3．一个两位数等于它的个位数的平方，且个位数字比十位数字大3，则这个两位数为（）A．25 B．36 C．25或36 D．﹣25或﹣364. 一元二次方程(x-2)2 = 9的两个根分别是( )A. x1 = 1, x2 =-5B. x1 = -1, x2 =-5C. x1 = 1, x2 =5D. x1 = -1, x2 =55. 用配方法解一元二次方程x2 -6x+5 = 0,其中配方准确的是( )A. (x-3)2 = 5 ,B. (x-3)2 = -4 ,C. (x-3)2 = 4 ,D. (x-3)2 = 9 .6．某经济技术开发区今年一月份工业产值达50亿元，且一月份、二月份、三月份的产值为175亿元，若设平均每月的增长率为x，根据题意可列方程（）A．50（1+x）2=175 B．50+50（1+x）2=175C．50（1+x）+50（1+x）2=175 D．50+50（1+x）+50（1+x）2=1757. 某种药品经过两次降价由原来的每盒12.5元降到每盒8元,如果2次降价的百分率相同, 设每次降价的百分率为x，可列出的方程为( )A. 12.5(1+x)2 = 8B. 12.5(1-x)2 = 8C. 12.5(1-2x) = 8D. 8(1+x)2 = 12.58. 对于一元二次方程ax2 +bx+c = 0 (a≠0),下列说法中错误的是( )A. 当a>0, c<0时,方程一定有实数根,B. 当c=0时,方程至少有一个根为0,C. 当a>0, b=0, c<0时,方程的两根一定互为相反数,D. 当abc<0时,方程的两个根同号, 当abc>0时,方程的两个根异号.二、填空题（每题2分，共20分）9. 若x = 2是方程x2 +3x-2m=0的一个根,则m的值为________ .10. 若方程(x+3)2 +a = 0有解，则a的取值范围是__________.11. 当x =__________时，代数式(3x - 4)2与(4x - 3)2的值相等. 12. 方程x (x + 2) = x + 2的根为_________ .13. 写出一个以2和3为两根且二项系数为1的一元二次方程, 你写的是____________. 14. 若一元二次方程mx 2+ 4x + 5 = 0有两个不相等实数根，则m 的取值范围__________. 15．在一次同学聚会时，大家一见面就相互握手．有人统计了一下，大家一共握了45次手，参加这次聚会的同学共有____________.人．16．足球世界杯预选赛实行主客场的循环赛，即每两支球队都要在自己的主场和客场踢一场．共举行比赛210场，则参加比赛的球队共有____________.支．17．用一根长24cm 的铁丝围成一个斜边长是10cm 的直角三角形，则两直角边长分别为____________.18．李娜在一幅长90cm 宽40cm 的风景画的四周外围镶上一条宽度相同的金色纸边，制成一幅挂图，使风景画的面积是整个挂图面积的54%，设金色纸边的宽度为xcm ，根据题意，所列方程为：____________.三、解答题19. 解下列一元二次方程（每题4分，共24分）(1) 0152=+-x x (2) ()()2232-=-x x x(3)052222=--x x (4) ()()22132-=+y y(5) (x + 2)(x - 3) = 0(6) (2x -1)2-2x + 1 = 020．己知a ，b 是一个直角三角形两条直角边的长，且（a 2+b 2）（a 2+b 2+1）=12，求这个直角三角形的斜边长．(本题5分)21．不解方程，求作一个新的一元二次方程，使它的两个根分别是方程272=-x x 的两根的2倍。

初三周练数学试题(1)
一．填空题（15×4＝60）
1．已知⊙O的半径为4cm，A为线段OB的中点，当OB=5 cm时,点A在⊙O ，
当OB 时, 点A在⊙O外．
２．三角形的外心是三角形的交点．
三角形的内心是三角形的交点．
３．在△ABC中，∠Ｃ＝90°，ＡＣ＝4cm，ＢＣ＝３cm．若⊙Ｃ的半径为２cm，则⊙Ｃ与ＡＢ的位置关系是；若⊙Ｃ与ＡＢ相切，则⊙Ｃ的半径等于．４．△ABC的内切圆⊙O与ＢＣ、CA、AB分别相切于点Ｄ、Ｅ、Ｆ．
（１）若ＡＢ＝９cm，ＢＣ＝１４cm，ＣＡ＝１３cm，则ＡＦ＝．
（２）若∠ＡＢＣ＝５０°，∠ＡＣＢ＝５６°，则∠ＢＯＣ＝．
（３）若∠ＢＡＣ＝８０°，则∠ＥＯＦ＝，∠ＥＤＦ＝．
５．⊙O1和⊙O2的半径分别为３cm和４cm．
（１）若Ｏ1Ｏ2＝８cm，则⊙O1与⊙O2的位置关系是．
（２）若Ｏ1Ｏ2＝４cm，则⊙O1与⊙O2的位置关系是．
（３）若Ｏ1Ｏ2＜７cm，则⊙O1与⊙O2的位置关系是．
（４）若⊙O1和⊙O2相切，则Ｏ1Ｏ2＝．
６．正十边形的中心角等于．
二．解答题(12+12+16)
７．如图，直线ＡＢ经过⊙O上的点Ｃ，且ＯＡ＝ＯＢ．
（１）若ＣＡ＝ＣＢ，求证：ＡＢ是⊙O的切线．
（２）若ＡＢ切⊙O于点Ｃ，求证：Ｃ是ＡＢ的中点．
Ｏ
８．有一个亭子，它的地基是半径为４ｍ的正六边形，求地基的周长和面积．（结果保留根号）
９．已知△ABC中，∠Ｃ＝90°，内切圆⊙Ｉ分别和ＢＣ、CA、AB相切于点Ｄ、Ｅ、Ｆ．（１）求证：四边形ＣＤＩＥ是正方形．
（２）若ＡＣ＝１２cm，ＢＣ＝５，求⊙Ｉ的面积．。

初三语文周末练习班级姓名学号本学案建议70分钟完成一（46分）1、给加点字注音或根据拼音写汉字。

（10分）雀跃．（）楹．联（）遐．想（）恬．静（）崭．新（）肃mù（）吝sè（） liào望（）萧sè（）怅wǎnɡ（）2、请给下面这段话中的两个加点字注音，并改正这段话中的两个错别字。

(4分)成长是一件最丰饶．的事情。

成长，让我从不有意泄怠自己。

成长，让我在满面皱纹时内心依然有葱笼的生机。

成长，让我由衷地热爱着头顶的每一颗星星。

成长，让我认真地耕．种着脚下的土地。

注音：饶（）耕（）改错：应改为应改为3、请给下面这段话中的两个加点字注音，并改正这段话中的两个错别字。

(4分)淮安的冬天，有时会下那么一两场的雪。

薄薄的，碎．碎的，仿佛等不及地要熔化。

大朵的更冰冷的雪，慢无边际飞落的时候也有，但总是不多。

天气多变，说不定才下过一场雪，接着就下起雨了，似乎是为着安慰那些总是盼着春天快来的人。

那无垠．的土地，总是湿润的、温暖的，仿佛适合万物生长，适合每一个有棱有角的人。

注音：碎（）垠（）改错：应改为应改为修改②：将‚近‛或‚多‛删去一个6、复习《格列佛游记》，完成下列填空。

（6分）《格列佛游记》这部作品中的主人公格列佛依次游历了小人国、大人国、飞岛国以及马国（慧骃国）等四个国家。

其中小人国利里浦特的党派之争以鞋跟高低划分阵营；大人国制度古朴，民风淳朴。

小说第三卷通过对飞岛国等五岛的描述，表达了对现代科技的怀疑，并严词痛斥殖民统治；第四卷更是以恣肆的笔调，展示了人兽颠倒的怪诞景象。

在这个乌托邦国度里，马是理性的载体，而人形动物“耶胡”则是邪恶肮脏的畜生。

7、古诗词默写。

（10分）①，春色未曾看。

②晓战随金鼓，。

③月黑雁飞高，。

④，在河之洲。

⑤黄河远上白云间，。

⑥，正是河豚欲上时。

⑦绿杨烟外晓寒轻，。

⑧泪眼问花花不语，。

⑨，春风不度玉门关。

⑩无言独上西楼，月如钩。

二（44分）（一）阅读《向日葵的爱》，完成8-12题。

山西省重点名校2024-2025学年初三第二学期英语试题周练七含附加题注意事项：1．答卷前，考生务必将自己的姓名、准考证号填写在答题卡上。

2．回答选择题时，选出每小题答案后，用铅笔把答题卡上对应题目的答案标号涂黑，如需改动，用橡皮擦干净后，再选涂其它答案标号。

回答非选择题时，将答案写在答题卡上，写在本试卷上无效。

3．考试结束后，将本试卷和答题卡一并交回。

Ⅰ. 单项选择1、-Have you improved your spoken English？-Not yet．I'll try my best______I am not good at it now．A．so B．although C．but D．until2、---What do you think of these two books?---_____ of them are interesting. And I’ve read them several times.A．Both B．Neither C．None D．Either3、In the bookshop, a reader asked the shopkeeper Harry Potter an interesting book?A．whether; are B．how; is C．that; was D．if; was4、_____ along the street, and you can find the hotel on your right, next to the market.A．Walk B．To walk C．Walking D．Walked5、— Dad! Could you drive a little fa ster? I’ll be late for the exam.—, dear! We still have twenty minutes left.A．No wonder B．No way C．No hurry D．No problem6、— Do you have any plans for the winter holiday?— Since you are crazy about music, why not go to some ________ concerts?A．livelyB．live C．alive D．living7、—Could I make a call with your phone? I left mine at home.—________. Here you are.A．Never mind B．Of courseC．Y ou’d better not D．I’m afraid not8、What does the sign mean?A．Don’t enter B．Watch your hand C．Dry your hand D．Be quiet9、Milk quickly goes bad _______ it is put into the fridge.A．if B．unless C．whether D．until10、一The pen writes well though it is only worth fifteen yuan.一Let me have a try. So .A．it is B．it does C．is it D．does itⅡ. 完形填空11、My name is Maria. I am fifteen. I am a middle school student. My parents are 1 in my school. My father is a science teacher, and my mother is a history teacher. Their lessons are 2 . All their students like 3 . I 4a brother. His name is Ben. He is thirteen. We go to 5 same school. His birthday is next week, 6 May 27th. I’ll go to the stores with my parents 7 school. My parents want 8 a sweater for Ben. Because his sweater is very9 Ben likes soccer, 10 I’ll buy Ben a soccer ball. I think Ben will have a happy birthday.1．A．students B．teachers C．players2．A．boring B．difficult C．interesting3．A．us B．her C．them4．A．have B．love C．help5．A．the B．a C．/6．A．on B．in C．at7．A．after B．at C．in8．A．buy B．to buy C．buys9．A．nice B．easy C．old10．A．so B．but C．becauseⅢ. 语法填空12、World Book Day falls on April 23 every year. It was set up by the UNESCO(联合国教科文组织) in 1955 to encourage people to discover the pleasure of 1．(read) . It means you read a book out of interest not because your teachers or parents tell you to do so. “Reading for pleasure ” plays a more important role 2．one’s growth than one’s family background.Books, magazines, newspapers and other kinds of materials can help us know 3．(many) about the outside world and perfect us. However, computer games, online videos and Internet are pushing books off the shelf. Some experts believe it’s a worrying trend(趋势).Each 4．( China) read 0.38 more books in 2013 than 2012 but still far fewer than those in major developed 5．( country). Even worse many bookstores have closed their doors 6．many book lovers start to buy fewer books than before.However, many people do still prefer reading because it has been part of 7．(they) life. It can benefit (使受益) people in many ways. It gives us information about other cultures and places of the world. It 8．has a strong influence on forming our personality and makes us more intelligent. The more we read, the more we know. The more we know. The 9．(smart ) we become. It’s never too late to start reading. So jump into the 10．(wonder )world of books now！Ⅳ. 阅读理解A13、Over the years, fried chips have become known worldwide and been enjoyed by adults and children in almost all countries. But do you know the world's First Potato Fry Museum was opened in November, 2013 in Belgium? For the fans of fried chips (French fries), they have a museum of their own!The world's first museum of chips, was set up by Eddy Van Belle and his son in Belgium. The museum calls itself "the first and only museum for potato fries".Eddy and his son are always proud of their favorite food. Eddy said, "Over the years, fries have become popular throughout the world. We are so proud that they originated from Belgium.""So it is normal and necessary that the first fried chips museum is opened in Belgium," Eddy added.The museum is in an ancient building with two floors. The museum shows a lot of exhibits, including ancient potato cutters, chip-making machines, and the pictures about the history of potatoes. You can see different potatoes and chips. You can also learn to make chips. It's a great place to learn about the history of fries and enjoy eating them, too! Do you know the biggest fun in the museum? You can eat many kinds of chips!1．The World’s First Potato Fry Museum was built in __________.A．America B．Belgium C．England D．Australia2．Why did Eddy and his son set up the museum in Belgium?A．Because there are more people interested in fried chips here.B．Because they are proud that Belgium is their motherland.C．Because they are the fans of fried chips.D．Because they want people to know about the history of fries.3．Which of the following is NOT true about the museum according to the passage?A．You can see the oldest chip-making machine.B．You can make the chips by yourself.C．You can see different kinds of potatoes and chips.D．You can have fun eating many kinds of chips.B14、Fred Astaire was born in Nebraska in 1899. Fred and his sister, Adele, learned to dance when they were very young. Their mother took them to New York to study dance. They performed in their first professional（专业的）show when Fred was ten years old and Adele was twelve. Later, as teenagers, the two danced in many shows throughout the United States. Their first big success was on Broadway in 1917.The Astaires -- as they were known -- quickly became Broadway stars. During the nineteen twenties, they sang and danced ineleven different shows. They also performed in England. In 1932, Adele Astaire married a British man, and stopped performing. But Fred did not____his dream. He would go on alone, in the movies.Fred Astaire had the best skill among all dancers in history. He danced up walls and on the ceiling in the film Royal Wedding. He danced on rooftops in The Belle of New York. He danced on roller skates in Shall We Dance?Fred Astaire made all this look easy. But it was not. He said: "Dancing is a sweaty job. You cannot just sit down and do it. You have to get up on your feet. It takes time to get a dance right, to create something memorable. I always try to get to know my dance so well that I do not have to think.”In 19, Fred Astaire won a special award for his film work from America's Motion Picture Academy. He also won awards from the television industry for a number of his television programs.Fred stopped dancing in 40. He was more than seventy years old at the time. He said a dancer could not continue dancing forever. He said he did not want to disappoint（使失望）anyone, even himself. He danced again in public only once after that. It was with another great male dancer, Gene Kelly, in the movie "That's Entertainment, Part Two".Fred Astaire and his first wife, Phyllis, had three children. Phyllis died in 24. Twenty-five years later, Fred married race horse rider Robyn Smith. Fred Astaire died on June 22, 1987. He was eighty-eight years old. He was called the greatest dancer in the world. His dancing was called perfect. And moviegoers everywhere will remember him as a great performer whose work will live forever in his films.1．The first paragraph is mainly about_________.A．Fred Astaire’s first success B．Fred Astaire’s educationC．Fred Astaire’s early life D．Fred Astaire’s family2．What does the underlined word “ forgo” in Paragraph 2 mean?A．Get over B．Set up C．Go ahead D．Give up3．What Fred Astaire said in Paragraph4 shows that ___________.A．he knew his dance was wonderfulB．he thought dancing was not difficultC．he devoted much time and effort to danceD．he had ways to make people remember him4．What is the correct time order of the following events?a .Fred Astaire’s first wife died.b .Fred’s sister Adele stopped performing.c .Fred Astaire performed with Gene Kelly in a movie.d .Fred Astaire won an award from America’s Motion Picture Academy.A．abcd B．bdac C．dcba D．cbadC15、Soon computers and other machines will be able to remember you by looking at your eyes! The program works because everyone’s eyes are different. So in the future you won’t have to remember a number when you want to use a mac hine or take money out of a bank. You’ll just have to look at the machine and it will be able to tell who you are.The eye-recognition (眼睛识别) program has already been tested in shops and banks in the USA, Britain, Spain, Italy and Turkey. Soon this technology will take the place of all other ways of finding out who people are.Eye-recognition is a course of recognizing iris (虹膜), which includes the following steps. First, a kind of machine needs to collect different examples of one’s iris from his eyes an d store them. Second, when this person goes to the bank to take out money, this machine will have iris feature extraction (采集). Then, this machine will compare the examples kept in it with iris feature extraction. Once the examples and the feature extraction are the same, this person will be identified (识别), and he will take out the money from the bank successfully.However, scientists are also working on other systems. Machines will soon be able to know you from the shape of your face or hand or even your smell! We have already had machines that can tell who you are from your voice or the mark made by your finger. Eye-recognition is better than other kinds because your eyes don’t change as you get older, and don’t get dirty like hands or fingers, and even twins have different eyes. So the eye-recognition program can be up to 94% correct, depending on how good the technology is. However, some other programs may only be 51% correct now. In Britain, it was found that 91% of people who had tried it said that they liked the idea of eye-recognition.In the future your computer will be looking at you in the eye. So smile!1．How does the eye-recognition program work?A．You look at the machine. B．You say your name.C．You type in your number. D．You show your ID card.2．Which recognition program has been already tested in shops and banks according to the passage?A．Remembering smells. B．Remembering fingerprints.C．Remembering the shape of faces. D．Remembering eyes.3．Put the sentences in the right order according to the passage.a. The man will take out the money from the bank successfully.b. This machine will compare the examples kept in it with iris feature extraction.c. A kind of machine needs to collect different examples of one’s iris from his eyes and store t hem.d. Once the examples and the feature extraction are the same, this person will be identified.e. When this person goes to the bank to take out money, this machine will have iris feature extraction.A．c-d-b-a-e B．b-d-c-a-e C．c-e-b-d-a D．b-e-d-c-a4．Which of the following is TRUE according to the passage?A．The eye-recognition program can be up to 51% correct.B．In Britain, 91% of people said that they liked the idea of eye-recognition.C．Everyone’s eyes are different, and even twins have different eye s.D．The eye-recognition program is widely used now.5．What’s the passage mainly about?A．Tell people how the eye-recognition program works and what advantages it has.B．We have already had machines that can tell who you are from your voice.C．You won’t ha ve to remember a number when you take money out of a bank.D．Scientists are working on the voice-recognition system.D16、HelpBy Kate | May 6, 2017Hi! Have you ever helped others? What did you do? Have a person ever helped you? Write and let us know!DISCUSSIONSally 9:30Two weeks ago when I did some running in the park. I fell and hurt my knee quite badly. A fewmoments later, an old woman helped me to stand up. Then she waited until my father came. I didn’tknow her but she helped me.● Reply ● ShareFred • 10:10On my fifteenth birthday. I stood in line to buy coffee in a coffee shop and I noticed that a manlooked very tired. I decided to buy a cup of coffee for him. When I gave him the coffee, I was veryhappy to see his smiling faces.●Reply ● ShareJoe • 11:00The day before yesterday I saw a boy lying on the street. I tried to wake him up, but I couldn’t. Icalled 999. He’s OK now. I made friends with him. He thinks I’m a hero, but I just did what wasright.● Reply ● ShareLisa • 11:20I always try to help other people. For example, I talk to my friends when they are lonely. I make ajoke at school when my classmates look bored. Last week I gave away my old clothes to the poor.● Reply ● Share1．Who helped Sally?A．An old woman. B．A man. C．A boy. D．The poor.2．When did Fred buy a cup of coffee for a man?A．Two weeks ago. B．On his fifteenth birthday.C．The day before yesterday. D．Last week.3．Joe saw a boy lying ______.A．in the park B．in a coffee shopC．on the street D．at school4．Last week Lisa ______.A．did some runningB．stood in line to buy coffeeC．made friends with a boyD．gave away her old clothes to the poorE17、Every day we use money to buy what we want. But have you ever really noticed the bill (钞票) in your hand? There are different pictures on both sides of banknotes (纸币) and interesting stories behind them.Most banknotes have famous people on the front, such as a country’s leader or a great scientist, while on the back of the pap er note there are usually some well-known scenes or national buildings.The latest editions of Chinese banknotes use the picture of Mao Zedong, founding father of the People’s Republic of China, on the front of all yuan bills. However, the backs of the bills are different. The Great Hall of the People, on the 100-yuan note, is a landmark (地标) in Beijing. Important meetings are always held there. The Lijiang River in Guilin, on the 20-yuan note, is one of the most beautiful scenes in the world.The US 1-dollar bill has the first president, George Washington, on the front side. A 13-level pyramid is on the back. Benjamin Franklin, a great scientist and politician (政治家) from the US, appears on the front of the 100-dollar bill. You can see the White House, where the presidents live, on the back of the 20-dollar bill.1．According to Paragraph 2, which one probably appears on the back of the banknotes?A．Abraham Lincoln. B．Elizabeth II.C．Taishan Mountain. D．Titanic.2．The Lijiang River of Guilin is __________.A．on the back of 20-yuan note B．on the front of 20-yuan noteC．on the front of 100-yuan note D．on the back of 100-yuan note3．On the front of the 100-dollar bill, we can see __________.A．George Washington B．Benjamin FranklinC．a 13-level pyramid D．the White HouseF18、There lived a couple in a small town in Australia. The lady was very talkative(多话的). Usually she kept talking with people on the phone hour after hour when she was alone at home. Once in a blue moon, she hung up in 30 minutesAt the end of every month, when the couple got the telephone bill, the husband was amazed by the cost and he was so worried about this. The lady promised to talk for a shorter time, but she didn’t keep her promise, though she really tried hard.One Saturday evening, they were dining at the table and the phone rang.The lady stood up immediately. She ran to the phone and started chatting.After about 30 minutes, she hang up and came back to the table.The husband was happy that she hang up in 30 minutes which was a good sign where she normall y doesn’t hung up at least for 2 hours. So he asked happily, “________?”“No, it was a wrong number.” replied the lady.根据短文内容选择最佳答案。

一、选择题1.下列几组物质按酸、碱、盐顺序排列的是（）A．KNO3、NaOH、HCl B．Ca(OH)2、HCl、NaClC．H2SO4、Na2CO3、Ba(OH)2D．HNO3、KOH、CuSO42.下列物质中，属于盐的是（）A.氯化钠B.盐酸C.氧化镁D.氢氧化铝3．现有氧化铁.稀硫酸.氢氧化钠溶液.和碳酸钠溶液四种物质，在常温下它们两两相互发生的化学反应有（）A.3个B. 4个C. 5个D. 6个4.下列物质能够反应，且没有明显现象的是（）A. Na2CO3溶液加入稀盐酸中B. Fe2O3加入NaOH溶液中C．稀HCl滴入Ba(OH)2溶液中D．CO2通入澄清石灰水中5．在A + B 盐+ 水的反应中，A 、B不可能是（）A．硫酸和熟石灰B．生石灰和水C．二氧化碳和烧碱D．氧化铜和硫酸6．下列各组物质中，在通常情况下不能发生化学反应的是（）A．铁与硫酸铜溶液B. 氢氧化镁与稀盐酸C．碳酸钠与稀硫酸D.银和稀盐酸7.下列物之间的转化，能通过一步反应实现的是（）A. CaO→Ca(OH)2B.Fe2O3→Fe(OH)2C. CO2→Na2CO3D．Na2CO3→NaCl8.下列溶液暴露在空气中，因发生化学变化而使溶液质量增大的是（）A.浓硫酸B.浓盐酸C.澄清石灰水D.氢氧化钠溶液9．氢氧化锂（LiOH）与氢氧化钠性质相似的，它不可能具有化学性质是（）A.与二氧化碳反应B.与盐酸反应C.与氧化铁反应D.与硫酸铜溶液反应10、下列物质相同的是A 银和水银B 冰和干冰C 生石灰和熟石灰D 火碱和烧碱11、下列各组括号内除杂技的方法或试剂错误的是（）A．CO中混有CO2 （氢氧化钠溶液）B．Cu粉中混有CuO（稀硫酸）C．CaO中混有CaCO3（盐酸）D．Cu粉中混有Fe粉（用磁铁吸引）12除去下列物质中的少量杂质，所选用的试剂及反应类型均正确的是（）13.根据下列实验事实推出结论正确的是（）编号实验事实实验结论A 某溶液使酚酞溶液变红该溶液一定是NaOH溶液B 某物质可以导电该物质一定是金属单质C 某溶液使石蕊试液变红该溶液一定呈酸性D 某气体不能使带火星的木条复燃该气体一定不含氧气14.进行化学实验必须注意安全，下列做法符合实际的是（）A．不慎将浓硫酸沾到皮肤上，应立即用稀氨水冲洗，再涂上硼酸溶液B．氢氧化钠有强烈的腐蚀性，实验使用时，最好戴上防护眼镜C．在实验室里可用品尝的办法区别食盐和蔗糖晶体D．配制稀硫酸时，可先在量筒中加入水，再慢慢注入浓硫酸并不断搅拌15.下列实验中观察到的颜色正确的是（）A.生石灰放入水中温度降低B.酚酞试液滴入硫酸溶液中变红色C.铁锈放入稀盐酸中溶液变黄色D.硫酸铜溶液中滴加氢氧化钠溶液出现红褐色絮状沉淀二、填空题：16.在①浓硫酸、②氢氧化钠、③稀盐酸、④氢氧化钙这四种物质中选择适当物质序号填空：（1）常用于干燥二氧化碳气体的干燥剂是.（2）实验室用于制取二氧化碳气体的酸是.（3）实验室用于检验二氧化碳气体的碱是.（4）俗名为消石灰的物质是.（5）溶于水时温度升高的物质是。

第四次周练一、基础知识（12分）1、下列加点字的注音或书写有误的一项是（）A窒．息zhì黏．膜nián 猝然汗流浃背B蹂躏．lìn 自艾．yì浮躁坦荡如砥C晕．圈yūn袅．娜niǎo顿措眼花缭乱D秀颀．qí诓．骗kuāng弥漫白雪皑皑2、依次填入下面横线上的词语，最恰当的一项是（）生命的历程中，人们往往丢掉当时觉得不重要的东西，抛掷时毫无；等到时光逐渐流去，失去的东西在流光中却不停地，在回忆里逐渐被放大。

时光虽缓，渐渐也远逝了，等有一天终于，光阴却已永不回头。

A惋惜闪烁醒悟B怜惜闪耀醒悟C怜惜闪烁悔恨D惋惜闪耀悔恨3、下满句子没有语病的一项是（）A通过汉字书写大赛，使人们重拾汉字之美，也就越发珍惜纸质时代的美好。

B华人游子用他们所钟爱的音乐方式，在过去的岁月中创作了优秀的大量歌曲。

C深受人们喜爱的中国京剧脸谱艺术，被公认是中华民族传统文化的标识。

D为了优化育人环境，提升办学水平，学校加快了校园环境改造的速度和规模。

4、下列句子组成语段顺序排列正确的一项是（）文章的好坏，与长短无关。

文章要讲究气势的宽阔、意思的深入，长短并无关系。

长短要求其适度，性质需要长篇大论者不宜过于简略；性质需要简单明了者不宜过于累赘，如是而已。

所以文章之过长过短，不以字数计，应以其内容之需要为准。

⑥常听见人说，近代人的生活忙碌，时间特别宝贵，对于文学作品都喜欢短篇小说、独幕剧之类，也许有人是这样的。

不过我们都知道，长篇小说还是有更多的人看的；多幕剧也有更多的观众。

人很少忙得不能欣赏长篇作品，倒是冗长无谓的文字，哪怕只是一两页，恹恹无生气，也令人难以卒读。

③作文知道割爱，才是进入第三个阶段的征象。

④须知敝帚究竟不值珍视。

⑤不成熟的思想，不稳妥的意见，不切题的材料，不扼要的描写，不恰当的词字，统统要大刀阔斧的加以削删。

①芟除枝蔓之后，才能显着整洁而有精神，清楚而有姿态，简单而有力量。

1. 下列各数中，有理数是（）A. √2B. πC. -3/5D. 无理数2. 已知 a > b，则下列不等式中正确的是（）A. a + 2 > b + 2B. a - 2 > b - 2C. 2a > 2bD. a/2 > b/23. 在直角坐标系中，点P的坐标为（2，-3），则点P关于x轴的对称点坐标为（）A.（2，3）B.（-2，-3）C.（-2，3）D.（2，-3）4. 已知一元二次方程 x^2 - 5x + 6 = 0，则其两个根之和为（）A. 5B. 6C. 7D. 85. 下列函数中，y是x的二次函数的是（）A. y = 2x + 3B. y = x^2 - 4x + 5C. y = 3/xD. y = √x6. 在△ABC中，∠A = 60°，∠B = 45°，则∠C的度数为（）A. 75°B. 90°C. 105°D. 120°7. 若 a > b，且 a^2 > b^2，则下列不等式中正确的是（）A. a > bB. a < bC. a^2 > b^2D. a^2 < b^28. 下列图形中，不是平行四边形的是（）A. 矩形B. 菱形C. 等腰梯形D. 长方形9. 已知函数 y = kx + b，其中k ≠ 0，若直线 y = kx + b 经过点（2，3），则下列说法正确的是（）A. k > 0，b > 0B. k < 0，b < 0C. k > 0，b < 0D. k < 0，b > 010. 下列命题中，正确的是（）A. 所有奇数都是正数B. 所有正数都是偶数C. 所有正数都是无理数D. 所有有理数都是整数11. 若 a > b，则 a - b 的符号为______。

12. 已知 a = 3，b = -2，则 |a| + |b| 的值为______。