What color is the curtain?What’s the color of the curtain?哪一

What color is the curtain?What’s the color of the curtain?哪一 What color is the curtain?这句话中what作什么语? I think the color of your curtain goes with the color of the What the color of what's the color of y____ ruler What’s the nature of color? what the color of LOVE? What's the color还是What the color what color is the blackboard? What color is the sea? What color is the jacket?( what is the color是什么意思