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？（）

A.Change the display setting to extend the desktop.
B.In the Microsoft Windows Mobility Center window， turn on the Presentation Settings feature. 
C.Configure the external monitor as the primary display and the built-in monitor as the secondary display.
D.Change the secondary display resolution settings to make them equal to or less than the primary display resolution settings.

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？ （）

A.From the Previous Versions tab， restore the version of the file that contains the correct data.
B.Restore a version of the folder that contains the correct version of the file.
C.Open a version of the folder that contains the correct version of the file.
D.Copy a version of the folder that contains the correct version of the file. Replace the existing version of the folder with the older version.

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？ （）

A.Create a system restore point.
B.Create a backup of all file categories.
C.Create a Complete PC Backup and Restore image.
D.Perform an Automated System Recovery （ASR） backup.

单项选择题Your data recovery strategy must meet the following requirements： Back up all data files and folders in C： Data.  Restore individual files and folders in C： Data.  Ensure that data is backed up to and restored from external media.  What should you do？（）

A.Use the Previous Versions feature to restore the files and folders.
B.Use the System Restore feature to perform backup and restore operations.
C.Use the NTBackup utility to back up and restore individual files and folders.
D.Use the Backup and Restore Center to back up and restore files.

单项选择题You need to back up the existing data on a computer before you install a new application. You also need to ensure that you are able to recover individual user files that are replaced or deleted during the installation.  What should you do？（）

A.Create a System Restore point.
B.Perform an Automated System Recovery （ASR） backup and restore.
C.In the Backup and Restore Center window， click the Back up files button.
D.In the Backup and Restore Center window， click the Back up computer button.