2. ( ) (1012)4 =?(A) (110101)2 (B)(75)8 (C)(46)16 (D)(27)32。

49. Which of the following statements concerning the Black Death is NOT TRUE? (A) It was the biggest challenge to medieval medicine. (B) In the fourteenth century, an outbreak of Bubonic Plague broke out in Istanbul. (C) The international businessmen considerably extended the affected areas. (D) In the Middle Ages, people knew that the Bubonic Plague was contagious and infectious.