单项选择题X 纠错
完形填空：下面的短文有5处空白，请根据短文内容为每处空白确定一个最佳选项。
The development of the Semantic Web proceeds in steps， each step building a layer on top of another. The pragmatic justification for this approach is that it is easier to achieve （71） on small steps， whereas it is much harder to get everyone on board if too much is attempted. Usually there are several research groups moving in different directions； this （72） of ideas is a major driving force for scientific progress. However， from an engineering perspective there is a need to standardize. So， if most researchers agree on certain issues and disagree on others， it makes sense to fix the point of agreement. This way， even if the more ambitious research efforts should fai1， there wil1 be at least（73） positive outcomes. Once a （74） has been established ， many more groups and companies will adopt it， instead of waiting to see which of the alternative research lines will be successful in the end. The nature of the Semantic Web is such that companies and single users must build tools， add content，and use that content. We cannot wait until the full Semantic Web vision materializes-it may take another ten years for it to be realized to its full（75） （as envisioned today， of course）.
A.conflicts
B.consensus
C.success
D.disagreement
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单项选择题
求解两个长度为n的序列X和Y的一个最长公共序列（如序列ABCBDAB和BDCABA的一个最长公共子序列为BCBA）可以采用多种计算方法。经分析发现该问题具有最优子序列，可以定义序列成都分别为i和j的两个序列X和Y的最长公共子序列的成都为C[I，j]，如下式所示。采用自底向上的方法实现该算法，则时间复杂度为（）。
单项选择题
