阿摩線上測驗
39. According to this reading passage, how did the researchers assure the safety of the flying robots?
(A) A laboratory test was conducted.
(B) It was tested in a small town.
(C) It was analyzed by a computer stimulation test.
(D) It was tested in an artificial scenario.
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統計： A(11), B(133), C(29), D(205), E(0) #1814850
統計： A(11), B(133), C(29), D(205), E(0) #1814850
