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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In tests in a miniat...
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The roboticists dev...
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【翻譯】 一項新的研究發現，無論是衝入...
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