下列哪几个可被归类为操作系统？

1）Microsoft Office     2）Windows 7    3） Linux     4）Mac OS X

5） Google Chrome    6）Facebook

Your company uses DHCP to lease IPv4 addresses to computers at the main office. A WAN link connects the main office to a branch office. All computers in the branch office are configured with static IP addresses. The branch office does not use DHCP and uses a different subnet.You need to ensure that the portable computers can connect to network resources at the main office and the branch office. 
How should you configure each portable computer？（）

Your company has multiple DNS servers in the main office. You plan to install DNS on a member server in a branch office. You need to ensure that the DNS server in the branch office is able to query any DNS server in the main office, and you need to limit the number of DNS records that are transferred to the DNS server in the branch office.
What should you do？（）

If you need further information, please _______ our office.

Nowadays office work can be done by hand ______ very fast speed.

— May I speak to Tom?

— I'm sorry. He isn't in the office now.

—                                         

— Yes, of course.

 —                      ?

 — My mother is retired. My father is a manager. 

— It’s nice to meet you in my office.

—                      

A:Good morning. Phil Watson's office.
B:（）

PowerPoint2003是MS Office 2003系列软件之一。（）