All the light bars were turned on which filled the room with the

All the light bars were turned on which filled the room with these rotating（ ）of light.
A、minerals
B、substances
C、gases
D、beams
【正确答案】：D
【题目解析】：本题考查名词辨析。mineral”矿物”， substance“物质”，gas“气体”，beam“光线，光束”。句意：所有的灯都打开了，房间里充满了这些旋转的光束。故选D。