在句子He is whitening the house中，生成whiten的构词方法是（ ）。

中国大学MOOC: Colgate offers toothpastes to its customers with different needs like sensitivity, whitening, and launches different toothpastes brands. This is called ________ marketing.

Colgate offers toothpastes to its customers with different needs like sensitivity, whitening, and launches different toothpastes brands. This is called ________ marketing. A: mass B: differentiated C: undifferentiated D: concentrated

In China, people, especially women, do not like to be tanned at all. We think fair skin is more beautiful, so skin whitening creams are extremely popular in China and in sunny days the anti-UV umbrellas can be seen everywhere on the streets.