听力资源简介：

pick　
(v.) 挑选，选择

He picked Mark to be his roommate.
他挑了马克当他室友。

optimistic　
(a.) 乐观的

Calvin isn't very optimistic. He thinks he's going to lose this game.
卡文不是很乐观。他认为他会输掉这场比赛。