题目

书面表达Leeches as Medical Treatment Leeches are small wormlikecreatures that live in water and suck the blood of animals and humans. In thepast, though, leeches were commonly used in medicine. Then advances in scienceled to other kinds of treatments, and leeches disappeared from the sick room.Now, however, they are making a comeback. The use of leeches in medicinegoes back at least 2,500 years. Doctors used them to treat the sick in ancientEgypt, India, Persia, and Greece. It was believed in those days that takingblood from patients helped to bring their bodies back into balance. This bel（2014秋•潍坊校级期末）由1分子磷酸、1分子碱基和1分子a构成了化合物b，如图所示，则下列叙述不正确的是（ ）A．组成化合物b的元素有C、H、O、N、P五种B．a属于不能水解的糖，是构成生物体的重要成分C．若a为核糖，则由b组成的核酸主要分布在细胞质中D．幽门螺杆菌体内含的化合物m共四种