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答案：
E
S = 1 + 1/2
1/2²>1/3²>1/4²>1/5²>1/6²>1/5²>1/8²>1/9²>1/10²
S < 1 + 1/2²+ 1/2²+ 1/4²+ 1/4²+ 1/4²+ 1/4²+ 1/8²+ 1/8²+ 1/8²
S < 1 + 1/2²*2+ 1/4²*4+ 1/8²*3
S < 1 + 1/4+ 1/4+ 3/64<2
S<2
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