单选题 What docs the author mean by "aviation has been incompletely deregulated" ? (in Para. 3)

A、 Governmental restrictions are still imposed on aviation industry in many areas.
B、 Governments help establish rules for aviation industry only in America and Europe.
C、 Some countries hope to help their national carriers keep up their national prestige.
D、 Many countries discourage merger plans between foreign and domestic carriers.

【正确答案】 A

【答案解析】[解析] 由第三段可知，政府对航空业的管制实际上是各国普遍的做法，除了美国和欧洲，其他国家做法的实质都是政府管制。