单项选择题
A.Configure the computer to use the default sound scheme.
B.Enable the Presentation Settings option. Adjust the volume settings as appropriate.
C.In the Line In Properties dialog box， clear the Allow applications to take exclusive control of this device check box.
D.In the Presentation settings dialog box， select the I always give a presentation when I use this display configuration check box.
单项选择题 When you connect an external monitor to your portable computer， the same image appears on both monitors. You need to drag a window from one monitor to the other. What should you do？（）
单项选择题 You delete content from a file named Speed.doc that is stored in the C：\Data folder. You edit 20 files in this folder over the next two days. You need to restore the version of the file that had the correct data. You also need to ensure that the other files in the folder remain unaffected. What should you do？ （）
单项选择题 You need to ensure that you can recover system configuration and data if your computer hard disk fails. What should you do？ （）