用AgilentE64xx软件进行GPRSDT路测（FTP下载），并要连接GPS。请问该电脑至少需要（），以完成测试任务。

A.1个COM串口

B.2个COM串口

C.3个COM串口

D.4个COM串口

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．consolidates

B．consists

C．considerate

D．consoles