[单项选择]Your explanation for eruption of the disease（）all right.
A. sounds
B. have sounded
C. is sounding
D. is sounded

[单项选择]All ships（）suspected infectious disease on board should radio information to Port Health Officer.
A. with
B. has
C. have
D. had

[单项选择] Does everyone in your office always agree all the time？ When someone makes a suggestion， does everyone just smile and nod in agreement？ When you bring forward an idea， do people just accept t？ Well， if you answered yes" to any of these questions， you are in an extremely unusual workplace. People are people. And people butt heads.They disagree， they argue， and they fight. You can’t get around it. But you can learn to deal with it To hold your own， you need to learn how to argue effectively. If you’ve got an opinion， you need to defend it. And if you have a problem with something a colleague has done， you need to let tem know. This can make for some difficult discussions and meetings， but this is just a part of life and business skills. So how can you argue effectively？ Well， you need several. （）From the first paragraph we can know that in the office.
A.  people sometimes argue
B.  people always agree 
C.  people always get around it

[单项选择] All client computers in your company run Windows 7. Windows Virtual PC is installed on all client computers. You create and configure a virtual machine (VM) named Guest1. You need to use the Guest1 virtual hard disk (VHD) as a base for additional VMs that will run on the same host computer, and minimize the disk space required for each new VM. Which type of VHD should you create for the new VMs？（）
A. fixed size
B. differencing
C. dynamically expanding
D. linked to a physical hard disk

[单项选择]A line connecting all possible positions of your vessel at any given time is a（）.
A. longitude line
B. latitude line
C. line of position
D. fix