400-600-1123
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答案：
B
最优情况
当1/3的十分位为偶数的元素都是0.2xxx，则进位时盈利0.8.
而剩下2/3的元素十分位为0.1xxx,则退位时亏损0.1.
E-S的差值就是0.8*10-0.1*20=6
最差情况：
当1/3的十分位为偶数的元素都是0.8xxx，则进位时盈利0.2
而剩下2/3的元素十分位为0.9xxx,则退位时亏损0.9
E-S的差值就是0.2*10-0.9*20=-16
可以举两个极端情况：（1）1.8和1.9；S=1.8*10+1.9*20=56，E=2*10+1*20=40，则E-S=-16；（2）1.2和1.1；S=1.2*10+1.1*20=34，E=2*10+1*20=40，则E-S=6
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