为什么用a表示年

七年级上历史与社会第56页 七上历史与社会题目2题 they have nice kites (改为否定句） talk with 和 talk to 有什么不同可以说talk with each other吗 为什么在英语句子中有些谓语动词要带be动词,而有时不用带? 用8*40的望远镜扫了一眼太阳到底有多大伤害?有那么严重么.能看见你的回答,我现在的视力应该在5.1到5.2,但是眼睛难受,看东西有晕,去医院查没大问题,说可能是结膜炎,同学说是散光的现象,左 1.they are waiting for a taxi.改否定句 2.my mother is cleaning the room now.改否定句教教我吧,不然老师会骂死我的! 这个句子里没有谓语动词 用英语怎么说 关于历史与社会的几道问题.1:孔子生于公元前551年,卒于公元前479年,孔子活了多少年?2:公元前202年刘邦建立了西汉王朝,公元9年西汉灭亡,西汉存在了多长时间? 已知数列｛An｝的通项为An=(n+2)[(9/10)n次方],问n取何值时,An的最大 it was Sunday afternoon and my mother was cleaning the room--------a.all for her b.all by her c.all by herself d.all by onself 这望远镜什么规格?8×21DCF我有一个望远镜,上面写着8×21DCF 383FT/1000YDS 128m/1000m 1.I have a volleyball.(改为否定句)2.My cousin has a computer。（改为一般疑问句）Look at the picuter，please。（用Let’s改写句子）We have many basketalls。(改为一般疑问句）He watches TV after class。（改为否定 We have five volleyball改否定句 He has some soccer balls 一般疑问句..肯定句 Plays basketball every day 改否定句 Peter has a nice bag 对NICE BAG 提问 Is that your watch?NO,it isn't变复数..知道的快啊... The wind ______ ,but it was still rather cold.A.no longer blew B.would no longer blow C.was no longer blowing D.had no longer blown 有些说A,C皆可,是不是?求详解 but it _____ be rather cold sometime.24.It is usually warm in my hometown in March,but it ________be rather cold sometimes.A.must B.can C.should D.would 若代数式a^2b^n-1/3与-3/7a^mb^2可以合并,那么m^n等于 sit的现在分词 morning（对应词）sit（现在分词）按照要求写出单词 英语翻译翻译一句话I would rather have his room than his company I’d rather have a room of my own, however small it is, than _______ a room with someone else.A．to share B．to have shared C．share D．sharing There is___ ___ in the sitting room.怎么填?There isn't a cat in the sitting room.(同义句）There is___ ___ in the sitting room. is there a sitting room 按顺序排列 某图书管理员想购买一套分上下两集的书.他带的钱如果只买上集,正好能买20本,如果只买下集正好能买30本他带的钱最多可以买这种书多少套?21:30之前. 理论力学难不难?怎么学? 理论力学怎么学 为什么理论力学这么那么学呢? 理论力学是学些什么? 理论力学 咋学啊 a,b,c,d,均为自然数,如果A*B=12,B*C=10,A*D=18,那么C*D为多少? 南昌航空大学怎么样啊? 夏朝,商朝,西周建立者,在几年建立的?都城在哪?几年被灭?亡国之君是谁?