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问题 单项选择题

以下方法不属于教师能促进学生做笔记和复习笔记的是( )。

A．讲演慢一点
B．重复复杂的主题材料
C．呈现做笔记的线索
D．在黑板上将所有信息罗列出来

答案

参考答案：D

解析： 教师在黑板上只需写出重要的信息即可。

综合

（10分）阅读下列材料，回答问题。

2000年以来，每年到九寨沟的游客都超过100万人次。旅游业的兴旺使大量的饭店、商场、宾馆、旅行社等涌进九寨沟内，污水垃圾遍地，九寨沟管理监测结果表明，九寨沟的水体已经有富营养化的趋势，湖泊有沼泽化倾向。

(1) 旅游旺季时，九寨沟景区人满为患，大大超过了其环境承载量。你认为该如何解决这一问题？（4分）

(2)从旅游规划、环境容量及游客承载量三个方面分析九寨沟应怎样开展生态旅游。（6分）
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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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