--- Next Monday is my birthday.

--- Is that so?  ______        

--- Thank you.

A．I don’t believe so.

B．I’m so glad.

C．What presents do you need?

D．Many happy returns of the day!

有关"系统工具"中"磁盘扫描程序"功能的描述正确的是

A．优化磁盘

B．压缩磁盘并腾出更多的磁盘空间

C．检查磁盘错误

D．格式化磁盘

E．以上都不对