单选题 An aircraft is equipped with a {{U}}sophisticated{{/U}} electronic control system for the sake of safety.
  • A. highly-developed
  • B. newly-invented
  • C. well-meant
  • D. long-lived
【正确答案】 A
【答案解析】sophisticated：先进的，尖端的，老练的；highly-developed：先进的，发达的；newly-invented：新发明的；well-meant：善意的；long-lived：长寿的。