帮我区分一下以下几个英语介词答:失望,be good at擅长, be impatient at对…不够耐心, be mad at狂热于,be pleased at对…感到高兴, be present at出席, be satisfied at满意,be surprised at吃惊, be shocked at对…非常震惊,be terrified at受到…的恐吓,be quick at对…很机敏。例如: They were overjoyed at his return to work. ...