请教一个托福题~In plane geometry,the sum of the internal angles of any triangle has always equal to 180 degree.请问这句话哪里错了?

请教一个托福题~In plane geometry,the sum of the internal angles of any triangle has always equal to 180 degree.请问这句话哪里错了? 请教一道托福阅读题 谢谢 GEO是什么意思? in-plane switching 是什么意思 on the plane还是in the plane 请教两句德语的意思Sollen Menschen aktiv in das Klimageschehen eingreifen,und wenn ja,wie?Auch darum geht es ja auf Ihrer Konferenz.Geo-Engineering nennt sich dieser Ansatz,und es geht darum,die Erderwärmung zu stoppen.Wie weit sind Sie in-plane orientation 怎么翻译! IN A PLANE是在一个平面上的意思吗? 什么是geo系统 什么是GEO媒体 Geo-fence是什么意思? 街舞GEO什么意思 GEO是哪个国家? 请教一道托福口语题急用!describe the steps,through ehich you once learned a new subject and explain how you learned it.Please include details and exaples in your response.(2009 1 23) 托福听力材料中的一个问题.我五月份要考托福,在一个托福听力练习中遇到一句话“it is not an inexpensive faculty to be in. 请教托福TPO阅读中的一个句子是TPO6中的一个句子Hearing and telling stories about events may help children store information in ways that will endure into later childhood and adulthood.在这句活中that的先行词是谁?in ways 在 请教大大们几道高中英语语法题我这类题目很搞不懂额.1.At least 100 persons were killed in the plane crash,including 5 children.(为什么不可以是included或者contained或者containing呢?)2.Settled in a friendly way,their qu 请教there be 句型一题请教大家一个问题 _____(be)there any books in the box?No, there ____(be) only two balls. 急!谢谢.