选择题：Manufacturers have discovered the secret of colours in marketing______.

题目内容：

Manufacturers have discovered the secret of colours in marketing______.

A. by accumulating their various experiences

B. by experimenting with different colours

C. by developing the discipline of colour psychology

D. by trying not to make mistakes

参考答案：【答案仅供学习，请勿对照自行用药等】

最小的;最少的 a. m_ _ _ _ _ _

最小的；最少的 a. m_ _ _ _ _ _

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