单选题 The brain drain of experts away from developing countries will greatly influence these countries' development of ______ industry.
  • A.complicated
  • B.sophisticated
  • C.primitive
  • D.collective
【正确答案】 B
【答案解析】[解析] 各项的意思是:complicated“复杂的;难懂的”;sophisticated“精密的,尖端的;老练的,老于世故的”;primitive“原始的,粗糙的”;collective“集体的,共同的”。根据句意判断,答案为B。