参考答案

正确答案：A
答案：A
[试题分析] 事实判断题。
[详细解答] 在第三段，作者提到L-GG，as it's called，has been used to treat traveler's diarrhea and intestinal upsets caused by antibiotics. Even more intriguing, L-GG also seems to work against some viruses，including rotavirus，one of the most common causes of diarrhea in children in the U．S． and around the world．其中，对B，C，D三项的内容都有包括，但A所说的作用不在此列，应作为本题答案。