3. 已知函數f (x) = 5x4 + 3﹐g (x) = x3 - 2x﹐h (x) = x3 + 2﹐選出正確的選項﹕
(A)f (x)為偶函數 
(B)f (x)的圖形對稱於y軸 
(C)g (x)的圖形對稱於原點 
(D)h (x)為偶函數 
(E)h (x)為奇函數﹒

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