亲,问一下U_____ there are thousands of children who can not go to school.

亲,问一下U_____ there are thousands of children who can not go to school. 根据首字母,写单词.（英语的）那位英语高手帮我写一下,There　is　an　apple　 tree　behind　Meimei's　house.　There're　m_____　big　and　red　apples　on　it.　Now　Meimei　is　standing　u_____　the　tree. 英语填空today we are going to learn U_____ Threetoday we are going to learn U_____ Three.we m____ to get there in time. U_____ there are thousand of children who can not go to school. AR有什么含义?大家帮忙推测一下.我一朋友常常用“AR”,我很好奇,问他他说没有,但我们都坚信一定有其含义,大家帮忙推测一下可能会是什么? 第18题第2问中AQ乘以AR=3OP^2,但答案只求出了横坐标,纵坐标不求怎么求AR,AQ长度呢?感激不尽!这是个定理吗，麻烦推导一下 问一下下情景对话You can take a bus to g___ there.该填什么? 我想问一下当什么时候there前面需要加介词In,什么时候不加介词in? Is mr green your u_____? Hard seat made me u_____. There ar many children play in the park 这句话对吗 用介词in,ar,of,for填空There are some keys _ the case 苯环的Ar和ph有什么区别呢?能不能讲一下的! Na Al S Cl Ar 的原子结构示意图把示意图画一下 化学求质量分数中：ω,Ar,Mr请百科一下. NICKEL NITRATE ,AR/GR GRADE(250 grm for chloride) 请求翻译一下 问个戴维宁等效电路得提这个Req不理解 我认为应该是Req = R1+aR 问 与He Ne Ar的核外电子排布相同的粒子分别有哪些?