問題詳情

45 Over the past 3.5 billion years, roughly how many asteroids may have hit Earth?
(A)14  
(B) 85
(C) 113
(D) 11

參考答案

答案:C
難度:適中0.554688
統計:A(37),B(10),C(71),D(3),E(0)

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