题目

I work as a volunteer for an organization(组织) that helps the poor in Haiti. I decided to take my son Brain there for a week, hoping to educate him.Before getting out, I told Brain this trip would be tiring and hard. For the first two days, he said almost nothing. Then on the third day, when we were climbing over high rocky mountains, he turned to me and smiled, “Really hard.”After that, a five-year-old girl, wearing a too large dress and broken shoes, followed Brain around. Later he said regretfully(遗憾地), “I wish I could speak French.” I was surprised that this was from a boy洪泽湖不仅风光秀丽，而且盛产多种鱼类，所以自古就有“日出斗金”的美誉，下列组成洪泽湖生态系统的生物成分中，属于分解者的是（　　）A. 莲 B. 鲤鱼 C. 草鱼 D. 细菌和真菌