意思是:你最喜欢的食物是什么。
英语中what的相关用法。
一、 what用作关系代词，也即连接代词，引导名词性从句, 可以作主语、宾语、定语
1. 引导主语从句
例1：What made the school proud was that more than 90％ of the students had been admitted to key universities. 使学校骄傲的是90％的学生被重点大学录取。
例2 What makes the matter worse is that it begins to rain. 更糟糕的是开始下起雨来了。
2. 引导表语从句
例3 Are you still thinking about yesterday’s game ? ---Oh, that’s what makes me feel excited.
例4 The city is not what it used to be. 这个城市不再是先前的模样了。
3. 引导宾语从句
例5 A man’s worth lays not so much in what he has as in what he is. 人的价值不在于他有什么，而在于他是怎样的人。
例6 After what seemed like hours he came out with a bitter smile. 好像过了几个小时以后，他面带苦笑走了出来。
有关what的某些习语
1. What about…？(表建议或征求对方意见) ……怎么样?
例7 What about going to the movies ?
2. What for? (=why) (口语) 为何,为什么 ？
例8 Susan, will you please go and empty that drawer? ---What for ?
3. So what？ (表示不感兴趣或认为不重要) 那又怎么样? (口语)
4. what if…?/what though (表示建议或疑虑等) 倘使……将会怎么样; 即使……又怎么样?
例9 What if I move the picture over here? --- I suppose it will look better.
5. What with… and (what with ). ……部分因为……, 部分因为……(后面通常接不好的事情)。 例10 What with overwork and what with hunger, he became sick at last. 一半由于工作过度，一半由于饥饿，他终于病倒了。