内蒙古和外蒙古的边界

词汇量只有3000,要想在今年12月中旬考托福,请问上哪里找一个老师帮助快速提高词汇量到8000?我是上海人. 陀螺为什么会稳定旋转,并且转得越快越稳?这是我自上学以来一直没有搞清楚的问题.下面是我个人的理解,请指出错误之处,并说明正确原理.陀螺不可能绝对地对称,肯定有一侧密度大些,体积 DON’T YOU USUALLY HAVE LUNCH AT HOME?YES,I HAVE IT AT SCHOOL（改错555555555````教教啊! Have you had your lunch?--Yes,l ( ) it at 11:45(适当形式填空） When do you have lunch?请帮我解答,Thank you very much! 如何测试自己的词汇量?mahilish，你太狠了。 怎么测试自己的词汇量?is this the method you use? 如何测试词汇量 怎么测量我自己的词汇量?怎么知道我自己的词汇量?我现在真的不知道自己的词汇量是多少…… 怎样测自己的词汇量 .具有一点挑战性,高手请进'''在Rt三角形ABC中,角A等于90度（AB〈AC）,E、F在BC之间（依次排列）,AE=3,AF=4,BE=EF=FC,连结AE、AF,AE=3,AF=4,求BC长度 2道英语选择题：..1.Have you decided yet?YES,I just now A.have decided B decided..为什么选B不选A2...I have finished my math homework.---When( )you( )it?A..have finished B..did finish .为什么要选择B答案?怎么想的.思路还有, 初中英语have you decided who you will invidedwho不是只能在后面是主语的时候用吗?这里是宾语不应该是whom吗? 25.—Have you decided yet?—Yes,I want to take this job and I_____change my mind.A.can’ 他昨天乘火车去了上海.用英语怎么说?虚心请教 基蒂乘火车去上海用英语怎么说(用两种方法说) 关于月亮的议论文,650字明天就要交了,小弟实在是不会啊,急, 急求一篇写曹操的议论文,三千字以上如题,要求最好能有他在《三国演义》和《三国志》上的对比,说出自已的看法,三千字以上.文字要好一点, 议论文关于父母爱650字左右 求学霸解答英语句子 求学霸解答三个英语句子 英语完成句子, 几道英语完成句子题,已写, 有关孝的散文,演讲,议论文!有感人优美的句子,不要实例 英语一到一百单词英语 paris,the capital of france,is one of themost beautiful cities in the world. Paris is the____of the European nation of France.Paris is the _____ of the European nation of France,it is also one of the most beautiful and most famous cities in the world.A.famous city B.capital paris is the capital city of france,s_ on the river seine空缺的是什么单词... Paris is the capital and largest city of France,__________(坐落) the River Seine.可以填哪些, Please __ __ your uncle and ask him to come for dinner. My uncle will come back to England tomorrow.My uMy uncle will come back to England tomorrow.My uncle will （）（）England tomorrow.（根据上句完成下句,使两句意思相同或相近,每词一空） would you like to come to the zoo tomorrow with me?sorry.i'm______to my uncle's farm