求证双曲线上任意一点到两条渐近线的距离之积为定值

Beckham is a football star.He is from______. Half of the books （ ）written in English A.is B.are C.have D.has half of his books ----written in English A: are B: have 为什么不用have? 详细点 Half of his books ( ) written in English.选项有is are have has,应该填写哪个?为什么? 我现在在银座上班用英语怎么说 if从句后用something还是anythingto see if there is anything wrong with you中anything为什么不用somethig那么if从句后一定不能加something吗，据个例子 if条件状语从句中something和anything必须用anything吗? 反问句“你怎么能不知道?英语中说 how can you don't know 还是how can't you know? neither books is good这个语法对么 BE动词是用单数还是复数 Neither of books is good 这里的主语是不是Neither of books 至于谓语用单数是不是因为中心词是neither可以这样理解吗 Neither of books 是名词短语吗 Of the making of good books there is no end; neither ___any end to their influence on man's lives.怎么翻译 Of the making of good books there is no end;neither ____any end to their influnce on man's lives.A.there is B.there are C.is there D.are there 为什么选b啊?there be 句型已经不是倒装句了吗? 请问这是什么鞋,有full length air 没见过面的朋友 英文 of the 4 books,one is written by a young weiter and （ ）are by an old oneA.other three B.three other C.the other three D.the three other have got和has got 的区别?那姓名是用那个？两个人以上的呢？ 英语题Since 2005,the boy hasn't missed ___ game of David Beckham,__famous football player.Since 2005,the boy hasn't missed ___ game of David Beckham,__famous football player.A.a;aB.a;theC.the;theD.the;a 英语 想买英语4级的词汇书和真题书,用什么书比较好,请推荐 阻碍海峡两岸关系发展的最大障碍是A.美国向台湾出售大量的先进武器B.“台湾当局”新领导人拒绝承认“一个中国”的原则C.日本对台湾的暗中支持D.“台湾当局”阻饶台湾商人到大陆投资 促进海峡两岸和平统一的因素有哪些 Scarborough 的读音是?有音标最好 fair的音标 音标发音问题 fire 和 fair 各自怎么发音呢? ★★初三英文表达:几千年来 含有被动语态的句子中的谓语动词都表示什么? 这个句子的主语和谓语动词分别是什么?A series of radiating diamonds of different colors emanating from the large central star.这句话的主语和谓语是什么啊,我怎么看不出啊. 小学三年级 翻译成英语表达 ★★初三英文表达:我在某楼的316室I'm at xxbuilding _____________ the fewer there will be lift for the future .啥意思 阻碍海峡两岸统一的政治因素有? Which book does he like best 改为同义句Which is ____ ____ ____ ____book