我认为PP2语法题中有几道题目有问题，请各位牛牛指教。

1、改错题：

Importance as foods, carbohydrates supply energy and are used to make fats.

我们知道A是错的，但是好象题干也有问题，正确的应该是：Important as foods are，.......

这里的ARE不知哪去了，是省略了吗？

还有一道填空题和这类似。

2、改错

As sweeteners, there is very small difference between honey and sucrose, although the former does cotain minimal quantities of vitamins, minerals, and amino acids.

答案是B，但是我认为是少了不定冠词a, 也就是说B的横线划少了，应该包括VERY，那答案就对了，是a very small difference.

请各位指教。

1. 形容词短语作状语

2. 改little. difference不可数