✔ 最佳答案
Yes, it is. It is because 95% of mainland’s vast Chinese population are "Han" by race. Who speaks Mandarin (meaning the language of Han) either by native tongue or by training (the only official teaching language in all schools in the country). Despites, 1,000s of different dialects, their writing remains the same (except for Taiwan, Hong Kong and Macau, which are the only places left using a similar Traditional Chinese writing).
Hope this helps answering your question.