检测目的基因是否导入受体细胞

英语作文.l,m proud of my faimly Once there lived a farmer.He was the happiest man in England.He was busy all day,but he was always happy.He also liked to make everybody else happy,and people all liked him.Finally the King heard about it.The King wanted to be happy like the farmer,s There was once a farmer who lived near a road. The farmer has lived in that small house_______A.since twenty years B.for twenty yearsC.twenty years ago D.for twenty years ago但我想知道为什么不选其他的,请详解,逐个排除, 第N个,用英语怎么说 she___（not read）the book before.请问是填she___（not read）the book before.请问是填什么时态 let ____(she)______ read the book she wants ____(read) a book怎么填?she wants ____(read) a bookLet's go and ____(see) our grandma正确形式 She never read such a book,( A.did she B.does she never前需要has吗?这儿的read是什么时态？ 英文的起源不要太长 she looked t her book before the examinationshe looked t_____ her book before the examination 黄泥螺、N次贴英语怎么说?请问：黄泥螺、N次贴、眼药水英语怎么说? 贴出用英语怎么说 “由来”用英文怎么说 “前n次”用英语怎么说 有没有用英文介绍圣诞节的由来滴? 1.She has read the book,too.改为否定句 She _read the book ___ She hasn't read the book _____（至今） 1.She has read the book,too.She ________ read the book ________.2.I’ve a 介绍伦敦2012奥运会的演讲稿演讲稿最好能控制在5分钟左右就能讲完,尽量简单一点.PS：一定要和2012年奥运会相关的,比如伦敦2012年奥运场馆,伦敦的环境,人文,对2012年奥运会做了哪些准备等等 求一个5分钟的英文演讲稿,关于伦敦奥运会对伦敦会造成什么影响,正面负面都可以,比如什么交通堵塞啊,空气质量啊,噪音啊什么的 方框中拨给单词的适当形式填空 , 使短文正确、通顺、每词限用一次（walk , proud , astronaut , excite , send , launch ）I watched TV last night . I saw some （）news on CCTV. China（）Shenzhou VLL successfully . It’s t He's never lost a book before.（改为反意疑问句）He's never lost a book before,( )( He has never lost his book.(一般疑问句） He`s never been there before,_________ __________?(完成反意疑问句)我填的是is,he?但是答案是has,he?我在前面没看到has? 美女 n.用英语怎么说? 我喜欢叫她“N”用英语怎么说? He comes from BeiJing,but now he ____(live) in SuZhou 这里填lives还是is living?Why?因为有now以为是现在进行时,但感觉好像是lives,课本上也这么写~虽然知道现在进行时不一定代表正发生的动作但是好纠结呐~ he is living in china now.he lives in china.这两句哪个对? He___in Paris now.这个用lives 还是 is living?考试的题! Where does he live?-He ___ in Beijing.A.livesB.liveC.is living 用英语写一片你在班会上的演讲稿,主题是"为迎接2008年奥运会,谈一谈自己的打算”.用英语写一片你在班会上的演讲稿,主题是"为迎接2008年奥运会,谈一谈自己的打算.”提示：1.适当使用开头