完全二叉树

describe an important rule or law in your countrywhai is it?who is it designed to protece?what do people think of it?and why is it important?谁帮我写下啊 100字左右 急 有多个句子或者短语并列时,每两个句子之间一定要加and吗?还是说也像单词一样最后一个加and就可以了? historical site 还是historic site?一般都用historic site吧?但今天在北京周刊上看到historical site,作者是个中国人,所以有点怀疑了,不知哪个对?还是都可以?意义上有差别吗? describe an important place in your life.explain why it is important to you.Include details and examples in your explanation.托福口语联系,请给一份 45秒种的发言,要符合新托福要求 Describe the most important development of your country in the past 20years.求托福口语回答! Describe an important change in your life.You should say:what it iswhat effect it has on youhow you feel about itand explain why it is important particularly,especially,还有specially的区别是什么?尤其是前两个词! 太阳黑子,耀斑,太阳风三者有什么关系,它们的周期相同吗 “思程”的英文翻译 长三角具体指的是哪些地方? 英语翻译请帮忙翻译下面这句,最好能准确翻译出句中的语气：我才不去他家呢!反正我已经见过姨妈了! 常用商务英语口语哪里有下载? 虚拟条件句 if从句时态一定要在主句的过去吗 time after time中文发音 TIME AFTER TIME 的中文发音 急需《TIME AFTER TIME》的歌词（中文发音）及钢琴谱~ after a timetime是不可数名字,为什么前面还可以加不定冠词a? 用所给词的正确形势填空.What time ( ) you ( ) (come)to us?I'll come the day after tomorrow. 英语美文(不要太长也不要太短,小学五年级下册的）一张A4纸的中间能容下就OK了 长一点,40~70字 _____would you like to live.(Where/Which place) I like the city where I live （in）. Please give ____ your pen ______pen isn't here I can bring your pen here改成一般疑问句 国旗的英语 国旗英文怎么说? ---May I use your pencil,Sue?---Yes,().A.here it is.C.give you 下列省略whether的虚拟让步状语从句1.Be he sick or well,he works entirely hard.2.Be I a worker or teacher,I should put my heart into my work.它们不倒装时的完整句子是怎样的? 为什么要叫让步状语从句别抄一堆,越简单越正确的理解越好, 比较让步状语从句中省略问题我在课外阅读时候遇到两种情况,不知道①②哪种对,还是说都对?情况①：Your brother is no less wise than you.此时比较状语从句than you is wise中（is wise）被省略.情况② 关于让步状语从句什么是让步状语从句?麻烦回答详细点 "过去中国很落后"用英文怎么说,