阿摩線上測驗
50. What are seismic waves？
(A) The periodic rising and falling of Earth's ocean surface.
(B) The waves of energy that travel through the Earth's layers.
(C) The waves that are generated from an electric field.
(D) The waves that generate tropical cyclones.
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統計： A(94), B(508), C(55), D(49), E(0) #2027090
統計： A(94), B(508), C(55), D(49), E(0) #2027090
