___________ a sportsman is a hard job, but you are very excited if you are successful in ____________a good medal.

A．To be, get

B．Being, getting

C．Being, to get

D．To be, to get

有关像素和体素不准确的概念是（）

A.像素实际上是体素在成像时的表现

B.体素是被按矩阵排列分隔的基本成像单位

C.体素是一个三维概念

D.像素越小，图像的分辨率相对越高

E.CT图像的基本组成单元称为体素