CT中窄窗的含义是（）

A.对比度较大，灰阶较长，包含较多的CT值

B.对比度较小，灰阶较长，包含较少的CT值

C.对比度较小，灰阶较短，包含较少的CT值

D.对比度较大，灰阶较短，包含较少的CT值

E.对比度较大，灰阶较短，包含较多的CT值

I argued with my parents until they finally ______ and let me drive every day.

A．gave off

B．gave out

C．gave in

D．gave over