The picture shows the population pyramid of the four countries. Look at the picture and complete the next question. Countries that may have a large number of immigrants in recent years and countries t

The picture shows the population pyramid of the four countries. Look at the picture and complete the next question. Countries that may have a large number of immigrants in recent years and countries that have recently had wars. B.C.

This topic examines the interpretation of population pyramid graphics. Countries that may have a large number of immigrants mainly show a high proportion of young and middle-aged men, because immigrants are mainly young and middle-aged laborers; The recent wars in countries are mainly manifested in the small proportion of young and middle-aged male population, because wars may kill young and middle-aged male population. So choose BC option for this question.