With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: In China and Taiwan, diglossia has been a common feature. For example, in addition to Standard Chinese, a resident of Shanghai might speak Shanghainese; and, if they grew up elsewhere, then they are also likely to be fluent in the particular dialect of that local area. A native of Guangzhou may speak both Cantonese and Standard Chinese. In addition to Mandarin, most Taiwanese also speak Minnan, Hakka, or an Austronesian language. It is common for Taiwanese residents to speak with a mixture of phrases, words, and pronunciations from their own languages and from Mandarin, and said combinations are normal and expected in everyday,
text_B: If a Taiwanese ambassador was giving a rigid, formal speech to the UN, in which she spoke almost entirely in a Taiwanese dialect, using Mandarin only when no reasonable substitute for a word or phrase was available, could this be construed as being somewhat combative, given the usual Taiwanese method of speaking formally?
NO.