第1题: [单项选择]They are sure they have all the facts they need to ______the existence of a black hole. A. obtain B. maintain C. verify D. display 参考答案:C 答案解析:[考点] 动词辨析 obtain “获得,得到”;maintain“维持;维修;坚持;赡养”;verify“核实,查对,证明,证实”; display“陈列,展览;显示,表现”。
[译文] 他们确