39.平衡石(statolith)是下列何種器官？
(A)重力偵測器(gravity detectors)
(B)電波探測器(radar detectors)
(C)地震感知器(earthquake detectors)
(D)移動偵測器(movement detectors)

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統計： A(317), B(4), C(11), D(96), E(0) #2735452