All the students _____two groups by the teacher during the competition.

A．were divided into

B．were divided

C．divide into

D．divided into

X射线CT设备不仅能得到被检物的（），还可以得到被检物断层图像以及三维图像。

A、黑白图像

B、透视图像

C、彩色图像

D、透明图像