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【单选题】
下列哪组中的函数f（x）与g（x）表示同一个函数的是（ ）A.
f（x）=x+1， g(x)= x 2 x +1
B.
f（x）=x 2 ， g(x)=( x ) 4
C.
f（x）=x， g(x)= 3 x 3
D.
f(x)= (x+1)(x+2) ， g(x)= x+1 x+2
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举一反三
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