硫酸根和亚硫酸根

it's a bridge to much k_____ 急集急 cars are an important p____ of life in the united states .without cars most people f____ that they are poor.and even though a person is poor ,he doesn't r ____ feel poor when he has a car are you surprised to hear from me?i have not heard from you s____ the beginning of the sunmmer holiday .how are you getting on your s____?how are your parents?is your brother bill b____ f_____ canada yet.急 but also stop the wind from b____ the dirt away.when a bit of rain falls,the plants h____ the water. watch over和look over的区别? TEACHER-who cleaned the blackboard yesterday?JOHN-I did.为什么回答是I did.而不是I cleaned. -Who cleaned the blackbroad yesterday,Dick?-John _____ A.cleaned B.does C.did D.is 选什么,为什么 ---Who cleaned the window yesterday?---I ___.---Who cleaned the window yesterday?---I _____.A.have cleaned B.did C.have done D.cleaned敝人才疏学浅,不知其解,这厢有礼了 爱的华尔兹填词,关于朋友的词 请帮我填词：朋友给我带来（ ）.多要几个词, 结合父母教育自己的实际案例写一篇作文 甲、乙二人骑车从相距65km的两地同时出发相向而行,2h相遇,若甲比乙每小时多走2.5kim,则加每小时走多少kin 把y表示成x的函数这句话的含义是什么,不太明白那如果把y表示成为t的函数，求y的取值范围，该怎么理解， 函数表示 这样是要x=y…… 还是 y=x……… Y表示X的函数: 函数是X表示Y还是Y表示XX表示Y也行y表示X也行吗急 根号3分之1= 能同时被3和7整除的最小奇数是多少? 根号-a^3-a根号-a分之1 a-1分之a -a+1分之1其中a=根号3 Miss Li and her students are having a lesson.改成否定句 一个圆柱体和一个圆锥体的体积相等,已知一个圆柱体的底面半径是圆锥体的底面半径的九分之四.那么圆锥体的高是圆柱体高的几分之几? 伦敦眼 LONDON EYE怎么样 What's gone with that boy?是在一部小说里的，可能没有语境的话，有点说不准了就 look what that waiter's gone and done.语法分析?waiter's gone and done是不是=waiter has gone and done?意思就是这个服务员都做了什么啊?那么what是不是gone 和done的共同宾语? 哪些的贫困山区的儿童失学需要帮助 计算(2xy的平方-3x的平方y+2xy)÷2xy结果 计算（-2xy-1）的平方 take it with me .what's meaning? 我觉得也许我们应该帮助一下这些贫穷的孩子们翻译成英语 what organisation was that with?中文? 农村儿童失学的英语翻译