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What is the theme of this quiz?
CORONAVIRUS - Within each pair of questions, the two answers begin with the same three letters. These three-letter segments, question by question, are sequential (and overlapping) three-letter segments from the string "CORONAVIRUS" (wrapped around so that it begins again where it ends). Thus overall in the first eleven questions, the pairs of answers begin with, respectively, COR, ORO, RON, ONA, NAV, AVI, VIR, IRU, RUS, USC, SCO.