会聚光束经过一平面镜反射后 （ ）
A：变成平行光束
B：变成发散光束
C：仍是会聚光束
D：以上情况都有可能
It's the third time you late for school this week.
Microsoft ended support for Windows XP after April 8, which _______a major operating system for some Chinese computer users, and advised users to upgrade to Windows 8.1.
