一个数列为1,一1,2,一2,一1,1,一2,2,1,一1,2,~2,…则该数列第2009项为()。

A．IOS

B． MX-OS

C． UNIX

D． Junos OS

A．signature

B． anomaly

C． trojan

D． virus

E． chain

A. an upgrade .gz file placed on your FTP server

B. an upgrade .tar file placed on your SCP server

C. an upgrade .pac file placed on your TFTP or SCP server

D. an upgrade CD provided by your Juniper Networks representative

听力原文：M: Do you prefer this new operation system to the old one？

W: I'm not sure. I think it quite complicated and it may take time to get familiar.

What does the woman think about the system？

A．The system is too complicated.

B．The system is familiar to her.

C．The system is not familiar to her.

D．She is not sure about the system.

A. IGP (Value 0)

B. EGP (Value 1)

C. Incomplete (Value 2)

D. It depends on the route‘s source.

A、Customer satisfaction

B、Quality

C、Flexibility

D、Productivity

What do you suppose is the (significant) _______ of advertising through social networks？

A．A.MS-DOS

B．B.CP/M

C．C.UNIX

D．D.all the above