阿摩線上測驗
31. What marine organism is responsible for the thick chalk deposits of the Cretaceous?
(A) Coccoliths
(B)Foraminifera
(C) Radiolaria
(D) Sponges
(E) Diatoms
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統計： A(1), B(0), C(0), D(0), E(0) #3049949
統計： A(1), B(0), C(0), D(0), E(0) #3049949
