设f（x）=2011^x，g（x）=0.99^x，h（x）=log_0.99x

则f（x）单调递增，g（x）单调递减，h（x）单调递减

∴f（0.99）=2011^0.99＞2011⁰=1

0＜g（2011）=0.99²⁰¹¹＜0.99⁰=1

h（2011）=log_0.992011＜log_0.991=0

即2011^0.99＞1，0＜0.99²⁰¹¹＜1，log_0.992011＜0

∴log_0.992011＜0.99²⁰¹¹＜2011^0.99

故选A