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 often used in informal speech, but it is even more common to use Mandarin in formal speaking.
text_B: Even if you couldn't speak any East Asian languages, yet you had a keen ear for the differences in sounds and words, would you be able to tell the difference between a formal speech and someone who was deadpanning a stand-up comedy routine, or a discussion that they overheard at a party, etc.
NO.