单项选择题
A.Click the Show my desktop on the external display only option.
B.Configure the Presentation settings to mirror your desktop on the external display.
C.Configure the Presentation settings to extend your desktop to the external display.
D.Reduce the screen resolution of your primary display to a value equal to the maximum resolution of the external display.
单项选择题 You connect your computer to a multimedia projector. When you play a video， you cannot hear the audio. You need to ensure that the projector provides audio and video playback. What should you do？（）
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？ （）