牧场上有一片匀速生长的草地，可供27头牛吃6周，或供23头牛吃9周.那么它可供21头牛吃几周？

we need to take a leap of faith 跪问,怎么解释~~~~~~~ where the river will flow 歌词Isggard（伊思嘉）的一首曲子,请问谁有歌词啊? I saw Tom get into his car and drive away 分析get和dive为什么前面是saw,后面两个动词却是get 和drive 用表的不同意义造句例：精 他助人为乐的精神很让人佩服. 这个人岁数不大,可是很精. 大家快点来帮我造句.在线等!若七点半等不到好的答案,直接关闭. 英语词组（世界环保日）怎么翻译 译词组：；来自全世界的年轻人 有谁知道the wind beneath my wings 这首歌的歌词这首歌是谁唱的? wind beneath my wings 的中文歌词谢谢咯~~ you are my left hemisphere of the wings wings you are the hero难学吗?我才学吉他七八个月,勉强能换熟F那种水平,突然好想学这首曲啊,要练多久啊… 为了有In order to,位于句首.请问for the sake of也有为了意思,他放在什么位置,怎么用? set off同义词是什么? i have been trying to find my way round ya'an ai have been trying to find my way round ya'an and get some shopping done怎麽翻译? I didn't qutie understand .qutie 可以换成其它的吗? 英语翻译A man who often has sympathy for others will be done favor to. I didn't really understand 我不太懂 I really didn'tI didn't really understand我不太懂I really didn't understand这两个句型都是正确的嘛各位亲? 连词成句 baseball in football American the USA enjoy people playing and 填空 1 If the ground begin s____while you are driving(我觉得应该是shake或shaking) use a cell phone while you are driving while在这里什么意思 老师说感谢信.Your English name is Kate.One year ago,your hometown suffered a terrible earthquakeYou lost your parents and your house.With the help of the Smiths who in Beijing,you went back to school again.Now write a letter to them with the he has become到底是什么时态?比如说Life has become richer by the love.这样的句子.现在完成时,不是应该has became吗?原句是has become，而现在完成式是have +过去分词。如果是现在完成式的话，那应该写成has as……as so……that too……to 中间要加什么词? so as to 后面接什么? so as to接从句吗?如果不能,哪些词是能接从句表目的 的? They can help me a lot to keep fit.这句话语法对吗 补全单词 Having a bowl of s____before a meal can help us keep fit. 英语翻译翻译：一般疑问句：省略形式： Mother makes me read English.改成变动语态等待中, Megan makes a telephone call to her mother every day将这个句子用call up 改写,就是改为同义句吧 think seng an e-mail是什么意思 seng an