阿摩線上測驗
46. What is this passage mainly about?
(A) Recent development of drones.
(B) Safety and legal issues of drones.
(C) Use of drones in the real estate industry.
(D) The various commercial applications of drones.
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統計： A(56), B(29), C(147), D(35), E(0) #637938
統計： A(56), B(29), C(147), D(35), E(0) #637938
