In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous systems. Typically, each deparlment or division has defined its own network needs (70) OS, LAN topology, communication protocols,applications, and other components.

A．same

B．similar

C．different

D．difference

桂枝茯苓丸治疗血瘀癥瘕，其中桂枝的作用在于（）

A.温经散寒

B.通经活血

C.养血和营

D.温经行气通阳

E.温阳行水