这个英语句子写对了吗?

题目

这个英语句子写对了吗?
Is apple healthy food?
Yes,it is./No,it isn't.
Are apple healthy food?
Yes,they are/No,they aren't.
这两个句子写对了吗?
Onion and pork are healthy food.
Onions and porks are healthy food.
这两句哪个对?

答案

两个都有错误.Is apple healthy food?（这是不定冠词表示泛指的一种用法,表示“一类”）Yes,it is./No,it isn't.Are healthy food?（这是名词复数表示泛指的一种用法,表示“一类”）Yes,they are/No,they aren't.An ...