如何求正弦曲线长度

I have been studying English _____ five years ago.应该填will还是since I've been studying English since 12. We have been studying english since we move here有一处错了 it's nine o'clock.we're late () the party Hello!That is my friend,Lily.这句话错在哪里?怎么改?-What's this?-This is a book.还有这句。 hi gina!why do you w __a hat i dont like my haircut.what's w___ with your hair?it's short and ugly .let me a l___.wow,you look cool you are smarter than b____.but it looks l___boy's hairstyle.i wear a hat so nobody can she it.but now it's summer it's Lily said that she wanted to go s____ in a forein country one day.首字母填空 What did you do with your old books?的同义句是什么? live the life that's right for me give you my heart as 万dun（）括号里应填什么dun是四声 Dun & Bradstreet Number是什么意思? 英文（有可能为缩写之类的dun=don't? dun=don't?例句Dun cry anymore,coz it's over.Smile,coz it happened.不要再哭,因它已过去；却要微笑,为什么翻译为Dun cry anymore,coz it's over.Smile,coz it happened.不要再哭，因它已过去；却要微笑，Dun cry anymore 这 My pan pal is in (Class 7,Grade 2).对(..)部分提问 一对农民夫妇,养了一只狗、一头猪和一头母牛.有一天母牛突然死了,请从里面的4个角色中推论出事情的经过母牛死后,男主也死了.男主死后女主死了!女主死后猪死了,猪死之后狗死了! 成语,一头猪一头羊? 英语选择题 There are so many kinds of computers in the shop. I really don't know __ to choose.英语选择题 请问是选B吗?但我一点也不明白,我觉得选 A,C都可以,译成选什么或怎么选嘛,为什么不选它们呢?麻烦讲 There are many c____buying things in the shop.名额有限! 等于dun' s 句字转换 Bill is in Class 3 Grade7.(用Class 3 Grade7题问)__ __ __Bill in? Bill is in Class Five.就划线部分提问 对FIVE提问4.She is in Row Nine.对 Nine提问 英语 对划线部分提问 1、Bill is in Class Five.划five ()()()Bi英语 对划线部分提问1、Bill is in Class Five.划five ()()()Bill()?2、She is in Row Nine.划nine ()()()she()?3、My father is a doctor.划a doctor ()is()father?4、Those Someone said that the ideal life is to live in an English country home,engage a Chinese cook,marry a Japanese wife,and take a French mistress. Give you my heart,can you don\' abandon翻译中文是什么意思? talk about和talk with 有什么区别啊?可以分别用在哪里? I Love You Babe 歌词 有首歌英文歌,中间唱的babe什么的, 最后一句是i love you女的唱的 I still love you babe 是什么意思啊·?我依然爱着猪、翻译英语是? 谁有 jealous cause i love you 的歌词 i love u babe,and if its quite alrite,o pretty babe to warm a lonely nite,i luv u babe,什么歌? Love,so soft and warm beside me,If I were to give my heart,It would have to be to you.Ed Walter翻译下3Q