题目

仔细观察如图，任意框出四个数，请将表格中其余三个数用含有字母的式子表示出来．如果框出的四个数的和是84，那么这四个数分别是多少？ 答案：【答案】17、18、24、25【解析】此题考查了简单图形覆盖现象中的规律，明确：横着相邻的两个数，从左向右依次增加1；竖着相邻2个数，从上向下依次增加7，是解答此题的关键．（1）根据表中数据可知：横着相邻的两个数，从左向右依次增加1；竖着相邻2个数，从上向下依次增加7；因为17+18+24+25=84， Are you nearsighted (近视的)? Do you ______ glasses? Many of you may ______ “yes”.In fact, China’s young people have the ______ rate (率) of nearsightedness in the world, according to a(n) ______ from the World Health Organization. More than 70 percent of middle school students in China are nearsighted.In August, a plan to ______ this problem was introduced. It tries to cut down the rate of nearsightedness for middle school students to ______ than 60 percent by 2030. Schools across the country are taking action to meet this goal.Luoyang Experimental School in Henan ______ its desks. It has designed (设计) desks with a board above the desktop. The board ______ students from lowering their heads too close to their desktops. More than 400 students have used them so far More students will do soon.Similarly, the High School Affiliated to Renmin University Chaoyang Branch School is now providing desks and chairs according to students’ ______ Studies have shown that proper desk height can ______ nearsightedness.Spending more time outside can ______ reduce (减少) nearsightedness. The Yucai Middle School connected to Chengdu No 7 High School makes sure ______ its students play outside for at least 80 minutes every day. “We have a PE class and a 20-minute break in the morning and afternoon to do exercises”, said Sun Zihan, 14.Staring at (盯) screens can also hurt our ______. Beijing 101 Middle School has a solution (答案) ______ this problem. In its classrooms, there are special boxes for storing students’ cellphones. “We have to ______ our cellphones every morning and get them back after school”, said Huang Jiameng, 15.【1】A.wearB.dressC.breakD.repair【2】A.talkB.speakC.sayD.tell【3】A.bestB.leastC.lowestD.highest【4】A.newsB.reportC.opinionD.decision【5】A.causeB.developC.cheatD.solve【6】A.fewerB.worseC.lessD.more【7】A.pulled downB.sold outC.paid forD.started with【8】A.leadsB.educatesC.stopsD.allows【9】A.heightsB.weightsC.agesD.interests【10】A.increaseB.changeC.preventD.continue【11】A.neverB.alsoC.seldomD.too【12】A.thatB.whatC.whyD.if【13】A.earsB.handsC.headsD.eyes【14】A.toB.onC.atD.in【15】A.give outB.reach forC.hand inD.pick up