一、Primary Colors托福听力原文： NARRATOR:Listen to part of a lecture in a studio art class. MALE PROFESSOR:OK...As-as you probably know,colors are,speaking,the basic colors from which all other colors can be ...

At the beginning of the color world, there are three primary colors -- red, yellow and blue. If you mix any of these colors together, the mixtures are called secondary colors. If primary and secondary ...