题目内容

假设一棵二叉树的后序序列为DCEGBFHKJIA,中序序列为DCBGEAHFIJK,请写出该二叉树的先序遍历序列。

查看答案

搜索结果不匹配？点我反馈

更多问题

Last year I read a frightening study that showed that pre-school and kindergarten children no longer believe they can sing songs. Little children have 1 got the impression that the definition of song is “what you hear 2 singing on the radio”. And when teachers try to 3 these children that they 4 sing, the kids just don’t see the point. Why should they struggle to perform a 5 version that only their mothers could possibly love? It’s so much easier to buy a CD and hear someone do it really well! Their logic is hard to argue 6 — and it’s a direct result of our society’s 7 with competence. Pleasure is no longer the aim of our 8 activities; in fact no one even sees anything pleasant 9 doing something less than perfectly well. This is crazy. And it’s 10 a terrible toll. Not only 11 depriving ourselves of creative satisfaction and 12 our children from finding joy in 13 they can do themselves — we’re also destroying our artists. In a world 14 we expect all our art to be supplied 15 highly competent professionals, the pressure on the professionals becomes too great to bear. 16 the number of musicians and artists who suffer from drug addiction, alcoholism or even commit suicide because of the pressures of keeping 17 our demands for more and better music, art, books and movies to enjoy in our 18 time. We are 19 our artists with our refusal to entertain 20 ourselves in our own incompetent ways.

1. 只要你喜欢你的业余爱好，那么你不必因为自己水平一般而感到羞愧。别人怎么看你无关紧要。2. 金钱在竞技体育中正显出其重要性，但我们必须确保它不会影响一些重要的东西。3. 我们都需要不时地锻炼来使自己保持身体健康。4. 我一再说该是你整理你自己房间的时候了，但你老是拖着。5. 一两年前他才开始学画画，所以技法还未达到专业水准。你能给他指点指点吗？6. 健康专家试图通过宣传吸烟的种种害处来使人们戒烟。7. 敬业是好的，但是不能让工作蚕食了你的全部休闲时间。8. 对于我来说，工作和业余爱好都必须严肃认真地对待。

西方人以红、绿、白三色为圣诞色,圣诞节来临时家家户户都要用圣诞色来装饰。红色的有圣诞花和圣诞蜡烛,绿色的是圣诞树。圣诞树是圣诞节的主要装饰品,上面悬挂着五颜六色的彩灯、礼物和纸花。圣诞老人是圣诞节活动中最受欢迎的人物。西方儿童在圣诞夜临睡之前,要在枕头旁放上一只袜子，等候圣诞老人在他们入睡后把礼物放在袜子内。

心理学发现，小时候养成的习惯有时候很难改掉，会跟着一个人一辈子。这给家长的启示就是小时候的教育十分重要，千万要想办法帮助孩子形成良好的习惯。比如说读书,适当让孩子背点古诗能培养孩子喜欢读书的兴趣,但千万不要操之过急。有些家长整天叫孩子读书写字,不但没有养成孩子喜欢读书的习惯，反而让孩子后来一看见书就产生畏惧心理。