单选题 Jackman believes that both business people and doctors ______. A. have to be good at management. B. should keep up to date with their field. C. need to select reading material carefully.
【正确答案】 B
【答案解析】题干要求的是商务人士和医生都应该怎么样。只有B项，应该密切关注他们的领域，正确；A项是对business man而言；C项文中未提及。