航空运输业统计由民航总局负责。
参考答案：对
解析：航空运输业统计由民航总局负责。
He is ____ as a leader but he hasn't ____ inteaching. [ ]
A. success; many experiences
B. a success; much experience
C. great success; an experience
D. a great success; any experiences
天文学包括哪三大学科？那一个是主流？
