問題詳情

46. According to the passage, the layers in varves are primarily formed by
(A) fossilized bacteria
(B) pieces of ancient dropstones
(C) a combination of ancient and recent sediments
(D) annual cycles of sediment transport and deposition

參考答案

答案:D
難度:適中0.5
統計:A(0),B(1),C(1),D(2),E(0)

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