PP1-131, small difference/minimal quantities

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

答案是B错，可我经常看到有small difference这种用法，google一下，small difference 有120,000,000条，little difference有102,000,000条。

我认为是D错，minimal quantities应该改成 minimal quantity。

请大虾们指教，多谢了！

虽然有时见到small difference的说法，但这里强调的不仅是little作为否定的用法，而且是表示程度的修饰词，small多指尺寸大小了。托福的语法是有严格规定的，并不是随处报刊杂志上见到的说法在托福语法中就能够接受。