右表为科技发明到生产应用所需时间表，它最能说明的一个现实是

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问题选择题

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A．科技革命对生产力起巨大推动作用

B．战后科技转化为生产力速度加快

C．战后科研领域不断扩大

D．科技发展丰富了人民的生活

答案

答案：B

单项选择题

The notion of NP-completeness has provided a (66) mathematical definition for (67) intractability of NP problems. But this measure applies only to worst-case complexity. Being NP-complete does not (68) that a problem is intractable on the average case. Indeed, some NP-complete problems are " (69) on average", though some may not be. Levin initiated the study of average-case intractability, He showed that a bounded tiling problem under a simple distribution is average-case NP-complete. Since then, several additional average-case NP-complete problems have been shown within Levin’s (70) . This paper is intended to provide a comprehensive survey of average-case NP-complete problems that have been published so far, and the techniques of obtaining these results.

（67）处填（）。

A．accessing

B．calculating

C．counting

D．measuring

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单项选择题 A1/A2型题

《中医药条例》中明确国家发展中医药的方针是（）

A.全面发展中医药

B.优先发展中医药

C.保持中医药特色

D.中西医并重

E.西医为主，中医为辅

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