问题详情

What can we learn from the passage？

A．It"s scientific to classify people into different groups according to their races.

B．The government didn"t pay enough attention on the issue of demographic shift.

C．The definite population of interethnic American is known.

D．The growing rate of interethnic Americans accelerates in recent years.

请帮忙给出正确答案和分析，谢谢！