--- Mom, can you buy me a skirt like this on my birthday?

--- Sure, we can buy ______ than this, but ______ this.

A．a worse one; as well as

B．a cheaper one; as good as

C．a better one; the same with

D．a much beautiful one; the same as

太阳光通过三棱镜后，被分解成七色光带叫做                        ，把白光分解成七色光后，依次是          、           、黄、绿、            、靛、          。其中光的“三基色”是指红、             、蓝。