题目

词汇运用；根据句意，用括号中所给单词的正确形式填空，每空一词。 1. Your idea is very     (value). I think it’s of great help to me. 2. Mary is a cheerful girl and she has fewer      (worry) than her classmates. 3. Tom was punished by his parents because of his      (careless). 4. Some children in other parts of the world still live in fear of      (they) lives. 5.September 3rd, 2015 was a(n)      (usual) day. We held a military parade(阅兵式) to celebrate the 70th anniversary of the victory of the world anti fascist war.已知某个三棱锥的三视图如图所示,其中正视图是等边三角形,侧视图是直角三角形,俯视图是等腰直角三角形，则此三棱锥的体积等于（ ）A． B． C． D．