单选题 Children from an {{U}}obscure{{/U}} family have to make greater efforts to climb the social ladder.
  • A. unknown
  • B. prominent
  • C. controversial.
  • D. rural
【正确答案】 A
【答案解析】[解析] obscure:无名的,暗淡的,模糊的,不容易理解的;unknown:无人知晓的,没名气的;prominent:著名的,明显的,突出的;controversial:有争议的;rural:农村的