Question

read the text.
of the 1.3 billion residents of china, approximately 850 million speak mandarin chinese as their first language. for more than 60 million others, cantonese chinese is their first language. although both languages are sometimes called \chinese,\ the two sound so different that a mandarin speaker and a cantonese speaker cannot understand one another. mandarin, spoken in beijing and much of northern china, is the official language of mainland china. cantonese, however, is more common in southern china and hong kong. both languages are tonal, meaning that when pronouncing words, the voice must rise or fall in certain ways. however, mandarin has four tones, while cantonese has nine different ones.
which organizational structure does this text primarily use?
cause - effect
sequential
compare - contrast

Explanation:

The text compares and contrasts Mandarin and Cantonese. It mentions similarities (both called "Chinese", both tonal) and differences (number of tones, regions where spoken, mutual intelligibility).

Answer:

compare - contrast