問題詳情

40.How do pilots avoid collisions with other planes in the air? The sky is mapped into highways just like the land is. Signals aresent up from control towers to mark these skyways.In this passage, the word collisions means _____.
(A) interference
(B) insects
(C) crashes
(D) skyline

參考答案

答案:C
難度:簡單0.85
統計:A(37),B(9),C(425),D(29),E(0)

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