如图，角AOB=45度，过射线OA

《写给郦道元先生的一封信》,关于三峡的,作文有没有关于三峡的写给郦道元先生的一封信的作文? 数列题 -2,-8,0,64（）A-64 B128C156D250 2,3,13,175,( )A30625 B30651 C30759 D30952请高手做做,小弟实在不会做.具体步骤写写 五年级上册语文第26课生字组词3个 证明数列a（n-1）-a（n）是等比数列已知数列a（n）满足a1=1,a2=3,a(n+2)=3a(n+1)-2a(n)(n属于N*） 数列a1=1/2,a(n-1)+1=2an(n≥2)求数列An的通项公式若数列Bn满足：2b1+2^2b2+~+2^nbn=n2^n,求数列bn的通项公式令Cn=2An×Bn,求数列cn的前n项和Tn 选择：1.The train is ( ) safe means of transportaion while radio and television are ( )important means of communication.A.a ;an B.a;\ C .\ ;the D.\;an2.I’m considering () a teacher after I leave school.Which is considered ( ) a respectable profe As we all know,parents are concerned____their children's study,because it is concerned ____their future.A.for;about B.about;for C.about;with D.with;about 求解高一英语题,要讲解I really don’t think my best friend w ill be angry, but I’11 go and see her,in case she _______.A．will be B．is C．does D. has been —Will you go home tomorrow evening?—No,I am going to a lecture,or at least I’m planning＿＿＿＿＿．A． so B． that C． it D． to 33—50英语选择题、、——￥— 32-33两个选择题,急,英语 33-38题. 33个数中?每六个为一组?一共有几组 1到33 6个数相加有几组可以到98 1至33选6个数一组 能选几组 列出来 紧急 1-33数子分6个数子一组能分成几组 If Tom doesn't accept the present,_____.A.so do IB.nor do iC.neither shall i这里为什么是选C呢?老师说横线的部分才是主句,因为是If引导的条件状语从句所以主句用将来时但不是用一般现在时表将来吗? 写出下列词语表示的年龄 总角 豆蔻 二八 弱冠 而立 不惑 知命 花甲 古稀写出下列词语表示的年龄 总角 豆蔻 二八 弱冠 而立 不惑 知命 花甲 古稀 耄耋 期颐. 英语好的同志们帮我写一片作文；假如你们班要组织一次集体旅游请根据下表中的信息给同学们写一个旅游计划游览地点 泰山 青岛计划时间 2天 3天活动内容 爬山(climb the montains) 去海滩 参 三个连续奇数的和是99,这3个连续奇数分别是多少?快 英语 (29 10:36:26)It ______ Mike and Mary who helped the old man several days ago.A．was    B．are    C．were    D．had been_______ four years since I left my home town.A．It was  英语 急.(29 10:33:14)This kind of material can be used to___________plastics.A．taking the place of  B．take place ofC．taking place of   D．take the place of________ is no use complaining about the present situation w 三个连续奇数的和是99,这三个连续奇数是（ ） 英语 英语 (12 9:0:54)1.I ran eight miles today.I never guessed that I could run _______ far.A.that B.much C.such D.as 为什么? 高一英语必修一29页第二题答案1.Here are my neighbours ( ）home was destroyed by the earthquake. 2.The terrible shaking of the building woke up all the people( )were asleep 3.The next day people put up shelters in the open ai 英语翻译1）我们的毛皮用来制作像你穿的那种毛衣2）你认为中国的熊猫正处在危险中么?3）这本书包含了50幅地图,其中包含了一幅中国地图和美国地图.4）他戴墨镜是为了保护眼睛不受伤害& 3个连续自然数的和是99,中间的数是x.其余两数分别是多少 5个连续奇数的和是55,中间的数是n.n是多少?列方程解 跪求人教版高一英语周报2009-2010第40期答案（总第3008期,高一英语下学期月考卷三（A）（B）还有加分的 高一英语周报人教版地36期答案 that's what friends are for 的中文意思 英语 we (12 14:54:49)句型转换1.In the following days ,he worked harder to earn enough money to support the fanilyIn the days____  ______,he worked harder to earn enough money to support family The day without you I am very lonely