题目

阅读理解Carl WilhelmScheele ranks as one of the greatest scientists of all time, but he paid a bigprice for this honor.Born in 1742 inpresent-day Germany, Scheele learned about chemicals from his parents startingat a young age. When he was 14, he was sent away to Gothenburg (哥德堡) to become the apprentice (学徒) of a familyfriend. There he spent eight years studying chemistry and conductingexperiments late into the night. Next, Scheele moved around the Holy RomanEmpire, working for different chemists and becoming more learned in his trade.In 1767, he moved to Stockholm, where he dis细胞是生物体的结构和功能的基本单位．下列不具有细胞结构的是（　　）A．艾滋病病毒B．细菌C．月季D．草履虫