已知{An}是公差为d的等差数列,它的前n项和为Sn,S4=2S24,Bn=1An/An求d

有时它会把一些有用的东西和垃圾一起扔进垃圾箱.英语翻译 拒绝复制 （ ）are my brothers.a.these b.this c.that d.（ ）are my brothers.a.these b.this c.that d.she选什么?为什么? 修改病句咧 1.This are my brother.2.That isn't me book.3.These is his brothers.4.Those is my mother.5.My father and my mother are my parent. This are her brother?这个说法对吗?那These are her brother? This his sister.these his brothers.改一般疑问句、做肯定否定回答,改为单数形式.急 ,,,these his brothers也改一般疑问句 请问,英语中宾语从句何时才能省略that?在英语的宾语从句中,连词that在什么情况下才能省略?例如?the characters I like are heroes like Superman or Batman.这样的句子是省略thai的宾语从句吗? How tall is your little brother?He is only four feet_______A.tall B.high C.long D.height ________ is your brother now? A:How long B:How tall Your brother is tall怎么改一般疑问句 ___is your brother like? 回答 He is tall they are his brothers改为一般疑问句并作否定回答 they are his brothers对his brothers提问 It often rains here in summer.So summer is the w_ season here. It (often )rains here in summer .对打括号部分提问马上就要! 连词成句 you,should,maybe,parents,ask,help,for,your want,it,to,on,phone,Italk,about,thesoccer,popular,is,very,the,world,all,overhave,a,fight,your,with,did,classmate,yesterday,youpollution,will,there,less,the,in,future,be Is your friend tall?的否定回答是NO,he isn't,还是用no,it isn't.因为这里的friend没有提及男女,所以到底是用it还是用he啊?it是不是可以指代性别不明和无生命的物体啊? 模仿伊索寓言写一则简短的寓言故事 There is a knife in my pencil-box.对划线部分提问There is a knife in my pencil-box.划线部分为a. “Which is stronger,a horse or an elephant?" she asked me.如何变为间接引语 Do you think which is heavier in the nature,____ elephant or ____ horse?为什么不能填 an a I won't lend you the book before I have finished it.为什么用have finished 英文字母A~Z造句举个例子：A呀,这B孩子C家的啊,站在D上,EF也不穿,还露个小GG就象这样,谁能造到Z… you,should,maybe,problems,ask,help,for,your(连词成句)_________ you __________ __________ your parents __________ help. is your car black? No,______.A、i'm red B、 it's red C、It's red [ ] is your pencil?It's red .1.What's color.2.What color.3.What colors.4.What's colors. Is your mother a nurse 是什么意思? 用好玩造句 Is your mother a nurse是什么意思 有没有什么搞笑的造句? Is your mother a nurse?Yes,it is.的中文意思是什么啊? 拂晓之后 是什么意思 具体含义又是什么?例如?