Travel by air has become safe,comfortable,rapid and above all __

Travel by air has become safe,comfortable,rapid and above all ______.
A、cheer
B、interesting
C、cheap
D、easy
【正确答案】:C
【题目解析】:选项C,“cheap”意思是“便宜的”,与“安全、舒适、迅速”一起,构成了乘飞机旅行的多个优点,且符合题干中“above all”所强调的乘飞机旅行的最主要优点,即经济性,所以C选项正确。