题意:在一棵树上找三个不同点,使的三点之间的路径通过最多的不同边。 解法:将树看一条长链像有机化学里的结构式,可以肯定长链的两端点(两次dfs找出最长链)是答案中的两点,第三个点有两种情况: 1、没有支链即只有一条长链第三点即为不同于端点的任意一点。 2、有支链,找一条最长的支链的端点(bfs找最长...
解析 本题考查方位介词的使用。 句意∶有三只鸟在树___。 in the tree表示“(不是树上长的东西)在树上”。 on thetree表示“(树上长的东西)在树上”。 一般不用at。 鸟不属于树上长的东西,用in the tree表示“在树上”。 故选A。结果一
Description You are given an unweighted tree withnn vertices. Recall that a tree is a connected undirected graph without cycles. Your task is to choosethree distinct verticesa,b,ca,b,c on this tree such that the number of edges which belong toat least one of the simple paths betweenaa an...
根据The last tree was still there(最后一棵树还在那里)可知,但有人认识他,这里表示肯定,故用somebody。故选C。(6)考查形容词。句意:有一天,一位贫穷的母亲想给她的孩子做一张木床。A.贫穷的;B.富有的;C.骄傲的;D.懒惰的。根据She had no money(她没有钱)可知,一位贫穷的母亲想给她的孩子做一张...
3-on-the-tree The gear shift on older makes of U.S. automobiles (especially those made between 1939 and 1970), which was located on the steering column and had three speeds. Primarily heard in US. My grandad still has his old 3-on-the-tree truck sitting in the shed. A: "What the...
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Once there were three trees on a hill. They were discussing their hopes and 1 . The first treesaid,"I wanted to be a 2 box. I could be flled with gold." Then the second tree said, "SomedayI will be a ship. I will take the king across the 3." Finally, the third tree said...
Long long ago, there were three treeson a hill. One day, they were talking abouttheir dreams(梦想). The first tree said,Some day, I hope to be a treasure chest(宝箱). I could be filled with gold andbeautiful stones. Then the second tree said, “Someday,I will be a big ship. I...
【解析】【答案】A【核心短语/词汇】in the tree:在树上【翻译】有三只鸟儿在树上。【解析】A项in(在...上);B项at(在...远);C项on(在...上)。根据句子后面"the tree'' ,结合句意可知,这里要填“鸟儿在树上”这一含义,由于鸟是外来物,因此用in,一般树本身具有的东西用on,例如树枝,树叶,树干,...
put a human face on:使更具吸引力;使更容易理解 带上一张“人脸”使之更加人性化,从而更具吸引力,更容易理解。 例句 The author puts a human face on the disease by interviewing people who have it. 作者通过采访疾病的患者而使这种疾病更容...