The most concentrated areas of Chinese and overseas Chinese in the world are () A. Japan B. Southeast Asia C. South Asia D. Russia.

Analysis of test questions: Most residents in Southeast Asia are of yellow race, among which Chinese and overseas Chinese account for a certain proportion. It can be said that Southeast Asia is the region where Chinese and overseas Chinese are most concentrated. So choose B.

Comments: Southeast Asian countries are multi-ethnic countries. There are more than 9 ethnic groups in the whole region, and Southeast Asia has the largest number of overseas Chinese and Chinese in the world. There are more than 2 million overseas Chinese and Chinese, more than 2 million Indians and more than 1 million immigrants from other countries in the region.