It is known that the equal ratio sequence {an} satisfies an ＞ 0, n = 1, 2 When n ≥ 1, log2a1 + log2a3 + +log2a2n-1=（　　） A. （n-1）2B. n2C. （n+1）2D. n2-1

∵a5•a2n-5=22n=an2，an＞0，∴an=2n，∴log2a1+log2a3+… +log2a2n-1=log2（a1a3… a2n-1）=log221+3+… +(2n-1) = log22n2 = N2