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. A Taiwanese may commonly mix pronunciations, phrases, and words from Mandarin and other Taiwanese languages, and this mixture is considered normal in both formal and in informal speech.
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?
YES.