1) What is the abbreviation for dna? a) Deoxyribonucleic acid b) Delxyribonucleic acid 2) What percentage of Vietnam's population is infected with the hepatitis B virus? a) 14-19% b) 15-20% c) 14-20% d) 16-21% 3) Which area has the highest rate of hepatitis B virus infection? a) Asia region b) Europe area c) African region d) Americas region

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