Manufacturershavediscoveredthesecretofcoloursinmarketing______.
A.byaccumulatingtheirvariousexperiences
B.byexperimentingwithdifferentcolours
C.bydevelopingthedisciplineofcolourpsychology
D.bytr yingnottomakemistakes
正确答案:A[解析]生产商通过积累的各种经验发现了色彩在市场上的一些小规律。故选A。



