题目

Winning a gold medal in the 2008 Olympic Games in Beijing ________ for a player representing China.         A．are great honored           B．is a great honor           C．is noted for             D．is great honor 答案：B 解析: 略 三条直线两两相交于同一点时，对顶角有m对，交于不同三点时，对顶角有n对，则m与n的关系是 [　　] A．m＝n B．m＞n C．m＜n D．m＋n＝10