—What’s wrong with my computer, Jack?

—Let me have a check. OK, it works now.

—You mean, nothing wrong with it, ________ ?

A．is there

B．isn’t there

C．is it

D．isn’t it

下列关于骨质破坏的X线表现，不正确的是

A．骨质局限性密度减低

B．局部骨小梁模糊

C．局部骨内无骨质结构

D．骨质局限性密度增高

E．局部骨小梁消失