a.

1. 兴奋的；激动的[（+about/at/over）][+to-v]
   She was excited to learn the news.

   她听到这消息很兴奋。

   She is very excited about winning the first prize.

   赢得首奖，她激动不已。

   The excited children were opening their Christmas presents.

   兴奋的孩子们在打开他们的圣诞礼物。

2. 活跃的
   the excited buying and selling of stocks

   活跃的股票买卖