若g（x）=2x+1，f[g（x）]=x2+1，则f（1）=（） A．1 B．﹣1 C．3 D

若g（x）=2x+1，f[g（x）]=x²+1，则f（1）=（　　）

A．1 B．﹣1 C．3 D．2

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若g（x）=2x+1，f[g（x）]=x2+1，则f（1）=（ ） A．1 B．﹣1 C．3 D

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若g（x）=2x+1，f[g（x）]=x2+1，则f（1）=（） A．1 B．﹣1 C．3 D