单项选择题 A Windows 7 user has documents spread throughout multiple hard drives and wishes to organizeand search them in one panel. Which of the following features should they be shown?（）

单项选择题 Users in an office routinely work with large graphics files. Which of the following preventivemaintenance tools can assist in maintaining system performance?（）

单项选择题 A user reports that their touchpad no longer works on their laptop. Which of the following is the FIRST troubleshooting step?（）