这两个词不难区分：
一般地,dessert是餐后的甜点,甜品的意思.比如水果啊,布丁啊之类的；有促进消化的韵味.
而Refreshments are drinks and small amounts of food that
are provided,for example,during a meeting or a trip.茶点,电影院里卖的提神的小吃啊等等.
此外,还可以指food and drink 食物和饮料,这可是比较正式的用法哦!
例：
May I offer you some refreshment?
可以请您吃点喝点什么吗?
what's the rush?则是指什么事这么匆忙啊?
what's up 就指什么事啊?很平常的问法.我个人觉得这二句差别不大吧!