【单选题】Certification of airworthiness is initially conferred by a certificate of airworthiness from a national aviation authority, and is maintained by performing the required maintenance actions. airworthin...
A.
Airworthiness is the measure of an aircraft's suitability for safe flight
B.
a special aircraft used for taking people to hospital
C.
a place where planes take off and land, with buildings for passengers to wait in
D.
a place where planes can fly from, especially one used by military planes
【简答题】听对话录音中有一段对话,听对话两遍后,从1-5各小题的A、B、C三个选项中选出能回答所给问题的正确答案。 1. How was Emily's school day? A. Terrible. B. Not too bad. C. Fun 2. What did she make at school? A. Paper planes B. Paper elephant C. Paper bikes...