如图4，用火柴摆出一系列三角形图案，按这种方式摆下去，当N=a时，共需多少根

( )Millie is helpful.She often does some____for the fashion show.A.jobs B.works C.job D.work She likes her job because she e___meeting people ( )does she work as a nurse?She likes to take care of people. 有四个装药丸的罐子,每个药丸都有一定的重量,被污染的药丸是没被污染的重量＋1.只称量一次,判断哪个罐子的药被污染了 你有5瓶药,正常情况下每个药丸重10克,只有一瓶受到污染的药丸重量发生了变化,变成了每个药丸重9克.给 有10瓶药丸,其中有一瓶药丸受到污染,正常药丸每粒10g,受到污染的药丸每粒9g,用天平找出受污染的药丸.要最快找出那瓶受污染的药丸,有什么办法,要最快的办法. 10个瓶子中都装了药丸 其中9个是1克的药丸 1个是0.9克的药丸 如何用天平一次就知道哪个瓶子里面是0.9克 有5瓶药,每个药丸重10克,只有一瓶受到污染的药丸重量发生了变化,每个药丸重9克,给你一个天平,你怎样一次就能测出是哪瓶药丸收到了污染? 为什么chocolate（巧克力）不可数名词? 李白的描写长江的诗 英语翻译：In her gentle nature,Mary takes after her mother. She takes after her mother.她长得像她妈妈.She looks like her mother.她长得像她妈妈.有什么区别?take after和look like的区别是什么? ---Don’t you think Mary takes after her mother very much?--- Yes,she’s the perfect ______ of her mother.A.symbol B.example C.model D.photo Don't you think Mary takes after her mother?.-Don’t you think Mary takes after her mother very much?　　-Yes.She’s a perfect _____ of her mother.　　A.symbol B.example C.model D.photo 有10瓶钙片,其中1瓶少3片,至少用天平称（ ）次能保证把它找出来. 有5瓶药片,其中一瓶少了3片,用天平要几次才能把它称出来 英语中的个体名词和物质名词怎么区分啊?为什么蛋糕和面包一个可数一个不可数有什么通俗的规律吗? 饺子.面包属于可数名词么饺子 面包 属于可数名词吗 汉译英：感谢生命所赋予给我的一切 我会记得!把灵魂还给生命.汉译英 He met her at a party.She was outstanding many guys were after her ,but no one paid attention to h she was _____ well dressed that she attracted everyone's attention at the party A:so B:quite C:too Dvery Her parents wouldn't allow her to go to the party,but she still ____这空为什么不能填hope so 或hope not .为什么非要填 hopes to She _ her friends to her party. One evening after work,a man drove his secretary home after she drank a little too much at a party. 有十瓶药,每瓶里装有100片药,有8瓶里的药每片10克,有两瓶每片9克,有一个够精准的天秤,怎样只称一次就找出较轻的两瓶.3楼,1＋51＝11＋41. 长着蝴蝶翅膀但是像蜻蜓,快下雨的时候和蜻蜓一起飞,是什么昆虫.长着蝴蝶翅膀,飞行方式也是更蝴蝶一样,但是样子像蜻蜓,快下雨的时候和蜻蜓一起飞,是什么昆虫.小时候很多,现在一只也看 我今天捉到一只长着蜻蜓翅膀蝴蝶身体的昆虫!（翅膀是透明的,有两对,和蜻蜓一样!脑袋上长了触须,就和蝴蝶的身体一样!）这是什么东西啊?我查过了,不是彩蝶蜻蜓! 9月天秤和10月天秤有什么区别吗?我是9月的. 再帮忙来个汉译英.不用瞒着我了我不再是曾经的那个孩子了再补充一句没关系 谁让我们是朋友呢?已经过去了 一个正方形盒子中恰好能放一个体积为628立方厘米的圆柱,这个盒子的容积是多少立方厘米 1.I take after my mother【改为同义句】I_____ _______ ______my mother2.Jenny likes helping homeless people.【改为定语从句】Jenny likes helping people_____ ______ ______ ________.3.we have run out of our food【改为同义句】 our foo