(2013·山东省胶东示范学校二模)—I forgot to bring my pen for the lecture.

—________. I have got a spare one.

A．Go ahead

B．You're welcome

C．Not to worry

D．Don't mention it

关于单纯性小肠梗阻的X线表现描述，错误的是

A．阶梯状液气平面

B．大跨度的襻

C．鱼肋征

D．透视下可见液面上下移动

E．假肿瘤征