问题补充:
He is about his chances of winning a gold medal in the Olympics next year.
A. optimistic
B. optional
C. optimal
D. obsessed
答案:
(答案→)A. optimistic
B. optional
C. optimal
D. obsessed
解析:句意:他对自己明年在奥运会上赢得金牌的机会很乐观。optimistic乐观的; optional可自由选择的,任意的;optimal 最佳的,最优的;obsessed迷住。根据句意判断选A。