Out of the following definitions of a project stakeholder, which one do you think is most appropriate ？（）

A．An enterprise whose employees are directly involved in doing the project work

B．An entity whose interest may be affected as a result of the project execution

C．An entity that performs activities to accomplish objectives

D．One who is responsible for managing the project

以童虫作为人体寄生阶段而无成虫寄生的是（）

A.蓝氏贾第鞭毛虫

B.链状带绦虫

C.斯氏狸殖吸虫

D.似蚓蛔线虫

E.刚地弓形虫