专项训练3

Before class was over, he told all his students to finish Exercise 8 in Unit 1. The next morning, as soon as he came
into the classroom, he asked, “Who's finished Exeቤተ መጻሕፍቲ ባይዱcise 8？”
2．What is Mr. Smith proud of? ___C___
A. All students are honest.
B. He teaches math very well.
C. His students often write to him.
D. He is strict with students.
When people are young, meeting and overcoming challenges will make them strong and ready to face life. When we look at successful people, we see that the most successful of them are people who have had to struggle. One famous businessman,
who now owns many big supermarkets, used to carry clothes on his back and sell them from door to door when he was young. Another successful man is Dennis. His father died when he was only twenty. His father's death forced him to mature fast. He had to bring up a family of nine people. He took up the challenges and overcame them. Today his brothers and sisters are leading successful lives. Sometimes challenges do not appear to us because we keep away from them. So some parents and teachers actively encourage young people to face challenges. They might organize some activities for young people which provide them with challenges, like rock--climbing, camping, volunteer work and so on. However, just passing exams will not prepare a person for life. We must meet and overcome challenges.

一、选择题1．—Do you have any problems _____ your English?—Yes, I have some difficulties _____ texts.A．with; reading B．read; study C．with; study D．in; with 2．—What do you think of your English teacher?—She is a good and caring one. Though her teaching style that of most other teachers, she always has more creative teaching methods than others do.A．is similar to B．is similar as C．the same as3．—How much chocolate ice cream would you like, Linda?—, please. It’s my favorite.A．Only a little B．Just a few C．A lot D．None4．—We are not supposed to the bus until the bus stops.—That’s right. Safety comes first.A．put off B．get off C．take off D．go off 5．—The fire was finally____ in Jilin on June 3. Unfortunately, 119 people lost their lives.—I hope the accident like this won’t happen again.A．put down B．put away C．put out D．put up6．High technology is used in EURO 2016 to the matches are fair enough in France. A．make up B．make sureC．come out D．come over7．My cousin is heavy because he often eats fast food．A．too much；too many B．too many；too muchC．much too；too much D．too much；much too8．________, the Internet was only used by the government. But now it’s widely used in every field.A．As usual B．At first C．After all D．So far 9．—Andy, would you please the report for me and see if there is any mistake?—Of course I will.A．look around B．look through C．look up D．look after 10．—You look so sad. What happened?一The exam to be much harder than I thought.A．broke out B．carried out C．put out D．turned out11．—Who is your favorite singer, Mike?—TF Boys. They are very ____ boys and girls.A．proud of B．popular withC．strict with D．worried about12．The math problem is so difficult that only few students can _______.A．work on it B．work for it C．work it over D．work it out13．Vivien worked very hard at all her lessons. __________, she became the top student in her class.A．In order to B．As a result C．As usual D．For example 14．—It’s everyone’s duty to join the Clean Your Plate Campaign.—Sure. We should try to _______all the food that we’ve ordered.A．give up B．eat up C．turn up D．show up15．--Mary failed the exam yesterday.--- Give her a phone call. We should ______.A．cheer up her B．cheer up C．cheer her up D．cheered up16．The exam is over and the results will be on Friday afternoon.A．put down B．put off C．put up D．put away 17．Pick up your pen and draw your own invention. Maybe it will be ____ a real product one day!A．turned on B．turned down C．turned into D．turned off18．---The government will focus on solving the problem of heavy burdens on the students.---That’s good news for us. We have too much work to do after school.A．give a hand to B．give attention to C．take part in19．My dictionary is lost. Could you help me________it?A．look for B．look up C．look through D．look after 20．The ancient buildings should be cared for________being pulled down.A．instead of B．against C．according to D．instead 21．—The meeting of the leaders from English club, basketball club and art club hasbeen________. Why?—I am not sure, It is said there is no need because of some reason.A．canceled B．cut out C．put off22．—As we know, from the sudden COVID-19 epidemic, being a Chinese,we are proud of our country.—Sure, we have________to grow up in China and we have confidence to fight________the disease.A．a good luck;against B．good luck;against C．a good luck;for 23．—Will the new term start next month?—No. It'll be________ until April because of the serious novel coronavirus epidemic.A．put on B．put away C．put up D．put off 24．Usually people with better education are able to get better jobs. ________, they have more chances to choose a good job.A．In other words B．On the other hand C．It's hard to say D．I'm afraid so 25．— Can I speak to Mrs Green？— Sorry, wrong number. Please to 114 and check the number.A．put out B．put off C．put through D．put away【参考答案】***试卷处理标记，请不要删除一、选择题1．A解析：A【解析】【分析】【详解】句意：——你的英语有什么问题吗？——是的，我读课文有点困难。

2020－2021学年度人教版七年级数学下册新考向多视角同步训练专项训练卷(三) 图表信息应用题1.(2020独家原创试题)2020年4月,某校为做好九年级复课工作,积极准备防疫物资,计划从A药房购买消毒液和酒精共40瓶,在获知B超市有促销活动后,决定从B超市购买这些物品已知消毒液和酒精在这两家店的售价如下表所示,且在A药房购买这些物品需花费900元(1)求出需要购买的消毒液和酒精的数量分别是多少；(2)从B超市购买这些物品可以节省多少元？2.(2019安徽宣城期末,20,★☆☆)根据小敏、小聪、小东、小强四人的对话内容,请你设计一下,分别安排多少立方米的木料做桌面,多少立方米的木料做桌腿,才能使生产出来的桌面和桌腿及库存的桌腿恰好全部配套？3.(2019江苏南京一模,19,★☆☆)【阅读材料】京市地铁公司规定:自2019年3月31日起普通成人持储值卡乘坐地铁出行,每个自然月份内,达到规定消费累计金额后的乘次,享受相应的折扣优惠(如图)地铁出行消费累计金额月底清零,次月重新累计比如:李老师二月份无储值卡消费260元,若采用新规定持储值卡消费,则需付费150×0.95+50×0.9+60×0.8＝235.5元【解决问题】甲、乙两个成人二月份无储值卡乘坐地铁消费金额共300元(甲的消费金额超过150元,但不超过200元).若两人采用新规定持储值卡消费,则共需付费283.5元求甲、乙两个成人二月份无储值卡乘坐地铁的消费金额各是多少元4.(2020贵州贵阳七中期末,22,★☆☆)学校为举行社团活动,准备向某商家购买A、B两种文化衫.已知购买2件A 种文化衫和3件B种文化衫需要170元；购买4件A种文化衫和1件B种文化衫需要190元(1)求A、B两种文化衫的单价；(2)恰逢商家搞促销,现有两种优惠活动,如图所示,学校决定向该商家购买A、B两种文化衫共100件,其中A种文化衫a件(a<50)①若按活动一购买,共需付款多少元？若按活动二购买,共需付款多少元？(用含a的代数式表示)②若按活动二购买比按活动一购买更优惠,求a的所有可能值5.(2019辽宁大连模拟,19,★☆☆)越来越多的人在用微信付款、转账把微信账户里的钱转到银行卡叫做提现.自2016年3月1日起,每个微信账户终身享有1000元的免费提现额度,当累计提现金额超过1000元时,累计提现金额超出1000元的部分需支付0.1%的手续费,以后每次提现支付的手续费为提现金额的0.1%(1)小刚在今天第一次进行了提现,提现金额为1800元,他需支付手续费元；(2)小明自2016年3月1日至今,用自己的微信账户共提现3次,3次提现金额和手续费分别如下表所示:小明3次提现的金额共计多少元？6.(2020山西太原十五中期末,21,★★☆)为鼓励市民节约用电,某市对居民用电实行“阶梯收费”(总电费＝第一阶梯电费+第二阶梯电费).规定:用电量不超过200度第一阶梯电费单价收费,超过200度的部分按第二阶梯电费单价收费,如图是刘鹭家2019年2月和3月所交电费的收据(度数均取整数)(1)该市规定的第一阶梯电费和第二阶梯电费单价分别为多少？(2)刘鹭家4月份家庭支出计划中电费不超过120元,则她家4月份的最大用电量为多少度？7.(2020山东威海一模,21,★★☆)下表是小丽在某路口统计20分钟各种车辆通过情况的记录表,其中空格处的字迹已模糊.(单位:辆)(1)根据表格信息,在表格中填写第一时段电瓶车和货车的数量(用含m、n的代数式表示)；(2)在第二时段内,电瓶车和公交车的数量之和恰好是第二时段车流总量的一半,且两个时段的电瓶车的数量之和为170辆①求m,n的值；②因为第二时段内车流总量较多,造成了交通拥堵现象,据估计,该时段内,每增加1辆公交车,可减少8辆小轿车和5辆电瓶车,若要使得第二时段和第一时段的车流总量最接近,则应增加几辆公交车？8.(2019重庆南开中学期末,23,★★★)近年来青少年中近视眼和肥胖的案例日趋增多,人们普遍意识到健康的身体是学习的保障,所以体育活动越来越受重视某商店分两次购进跳绳和足球两种商品进行销售,每次购进同一种商品的进价相同,具体情况如下表所示:(1)跳绳和足球两种商品的进价分别是每件多少元？(2)该商店计划用不多于5300元的资金进行第三次进货,购进跳绳和足球两种商品共100件,其中要求足球的数量不少于跳绳的数量,有哪几种进货方案？9.(2020浙江杭州萧山期末,22,★★★)某电器超市销售每台进价为80元、200元的A、两种型号的电风扇,下表是六月份前2周的销售情况:(进价、售价均保持不变,利润＝销售收入－进货成本)(1)求A、B两种型号的电风扇的销售单价；(2)若超市一共采购这两种型号的电风扇共120台,售完后该超市能否实现利润为800元的目标？若能,请给出相应的采购方案；若不能,请说明理由10.(2020江苏南通期末,22,★★★)小李在某商场购买A,B两种商品若干次(每次A,B都买),其中前两次按标价购买,第三次购买时,A,B两种商品同时打折,三次购买A,B商品的数量和费用如下表所示:(1)求A,B商品的单价各是多少元；(2)若小李第三次购买,A,B商品的折扣相同,则商场是打几折出售这两种商品的？(3)在(2)的条件下打折,若小李第四次购买AB商品共花去960元,则小李的购买方案可能有哪几种？【参考答案及解析】 专项训练卷 (三)图表信息应用题1.解析:(1)设需要购买消毒液x 瓶,酒精y 瓶,根据题意得⎩⎨⎧x+y ＝4024x+20y ＝900 ,解得⎩⎨⎧x ＝25y ＝15.答:需要购买消毒液25瓶,酒精15瓶。

一、等差数列选择题1．设等差数列{}n a 的前n 项和为n S ，若7916+=a a ，则15S =（ ） A ．60 B ．120C ．160D ．240解析：B 【分析】利用等差数列的性质，由7916+=a a ，得到88a =，然后由15815S a =求解. 【详解】因为7916+=a a ，所以由等差数列的性质得978216a a a +==， 解得88a =， 所以()11515815151581202a a S a +===⨯=． 故选：B2．在等差数列{}n a 中，()()3589133224a a a a a ++++=，则此数列前13项的和是（ ） A ．13 B ．26C ．52D ．56解析：B 【分析】利用等差数列的下标性质，结合等差数列的求和公式即可得结果. 【详解】由等差数列的性质，可得3542a a a +=，891371013103a a a a a a a ++=++=， 因为()()3589133224a a a a a ++++=， 可得410322324a a ⨯+⨯=，即4104a a +=， 故数列的前13项之和()()11341013131313426222a a a a S ++⨯====. 故选：B.3．“中国剩余定理”又称“孙子定理”，1852年英国来华传教伟烈亚力将《孙子算经》中“物不知数”问题的解法传至欧洲.1874年，英国数学家马西森指出此法符合1801年由高斯得出的关于同余式解法的一般性定理，因而西方称之为“中国剩余定理”.“中国剩余定理”讲的是一个关于整除的问题，现有这样一个整除问题：将正整数中能被3除余2且被7除余2的数按由小到大的顺序排成一列，构成数列{} n a ，则5a =（ ） A ．103 B ．107C ．109D ．105解析：B 【分析】根据题意可知正整数能被21整除余2，即可写出通项，求出答案.【详解】根据题意可知正整数能被21整除余2，21+2n a n ∴=， 5215+2107a ∴=⨯=.故选：B.4．设等差数列{}n a 的前n 项之和为n S ，已知10100S =，则47a a +=（ ） A ．12 B ．20C ．40D ．100解析：B 【分析】由等差数列的通项公式可得47129a a a d +=+，再由1011045100S a d =+=，从而可得结果. 【详解】 解：1011045100S a d =+=，12920a d ∴+=， 4712920a a a d ∴+=+=.故选：B.5．已知等差数列{}n a 中，161,11a a ==，则数列{}n a 的公差为（ ） A ．53B ．2C ．8D ．13解析：B 【分析】设公差为d ，则615a a d =+，即可求出公差d 的值. 【详解】设公差为d ，则615a a d =+，即1115d =+，解得：2d =， 所以数列{}n a 的公差为2， 故选：B6．已知数列{}n a 的前项和221n S n =+，n *∈N ，则5a =（ ）A ．20B ．17C ．18D ．19解析：C 【分析】根据题中条件，由554a S S =-，即可得出结果． 【详解】因为数列{}n a 的前项和2*21,n S n n N =+∈， 所以22554(251)(241)18a S S =-=⨯+-⨯+=． 故选：C ．7．在数列{}n a 中，129a =-，()*13n n a a n +=+∈N ，则1220aa a +++=（ ）A ．10B ．145C ．300D ．320解析：C 【分析】由等差数列的性质可得332n a n =-，结合分组求和法即可得解。