题目

三、听下面两段对话，每段对话都有几个问题，从题中所给的A、B、C三个选项中选择最佳选项，对话读两遍。【1】When is his birthday?A.In December. B.On 7th October. C.On 7th December.【2】Why does he like his birthday so much?A.He has a big party. B.He can play games. C.He can get lots of presents. 答案：【答案】【1】B【2】C【解析】【原文】略已知在△ABC中，∠C=90°，BC=8，AB=10，点G为重心，那么的 值为   ▲   ．