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问题 选择题

化简p-[q-2p-（p-q）]的结果为[ ]

A.2p

B.4p-2q

C.-2p

D.2p-2q

答案

答案：B

阅读理解与欣赏

阅读下面的文字，完成后面的问题。

        学术研究的目的，最终是要影响社会，影响大众的生活。实际上，我们赖以生存和生活的许多常识，当初都是高深的学术观点。抽烟有害，如今尽人皆知，当初却不过是实验室里的结论； * * 的意识和观念，在中国也日渐普及，起先却仅仅是象牙塔里的呼声。学术的通俗化，其实一直以各种方式在进行着。过去的学者，是很注重这方面的工作的，他们往往一方面从事很专业很艰深的研究，一方面又致力于将自己专业艰深的成果尽可能向社会普及。这种普及性的著作，也能成为经典。费孝通、萨孟武，都是在学术上颇有造诣的学者，他们都另有多种专业性很强的学术著作行世；至于他们的《乡土中国》《水浒传与中国社会》这样的著作，则是在非专业的报刊上发表文章的结集，都是民国时期的“通俗经典”。

        以这种眼光来看今日学术与大众的“零距离接触”，称之为学术娱乐化或许更合适。将学术娱乐化的目的，无非是名与利，迎合和讨好大众，就是他们的基本策略。大众最想听什么，听了什么最开心，他们就说什么。而将学术通俗化绝不这样。不妨以萨孟武的《水浒传与中国社会》为例。在这本通俗性的学术著作中，萨孟武对梁山泊集团予以坚块的批判和否定。他强调，以宋江为首的粱山泊造反集团，不过是一个“流氓集团”。他从多方面分析了这种“流氓集团”与中国社会的关系，指出这种“流氓集团”在中国历史上屡屡起着极其恶劣的作用。这样一种对“梁山好汉”的评说，显然与大众心目中原有的情感观念相冲突，而萨孟武的目的，就是要摧毁改变大众长期以来对“粱山好汉”的仰慕崇拜，就是想清扫中国社会长期存在的“水浒气”。如果让今天的那些热衷于将学术娱乐化的“学者”来讲《水浒传》，他们绝不会这样讲。他们一定会极力歌颂“粱山好汉”的“义”与“勇”，一定不敢对他们的滥杀无辜、打家劫舍有半句微词。为了最大限度地获取名与利，他们就必须最大限度地迎合社会上的“水浒气”。为了讨得大众更多的喜爱，也不妨顺便称林冲为“帅哥”，说李逵是“猛男”。而大众呢，大众自然乐得合不拢嘴。在这合不拢嘴的过程中，大众身上原有的“水浒气”，就被进一步强化了。

文中两次列举《水浒传与中国社会》，各有什么作用?

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单项选择题


The sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The sun has existed in its present state for about 4 billion, 600 million years and is thousands of times larger than the Earth.
By studying other stars, astronomers can predict what the rest of the sun’s life will be like. About 5 billion years from now, the core of the sun will shrink and become hotter. The surface temperature will fail. The higher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the sun will expand approximately 35 million miles, about the distance to mercury, which is the closest planet to the sun. The sun will then be a red giant star. Temperatures on the earth will become too hot for life to exist.
Once the sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the size of the earth, it will become a white dwarf star. The sun may throw off huge amounts of gases in violent eruptions called nova explosions as it changes from a red giant to a white dwarf.
After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf. After the Sun has become a black dwarf, the earth will be dark and cold. If any atmosphere remains there, it will have frozen onto the earth’s surface.

According to the passage, which of the following best describes the sequence of stages that the sun will probably pass through

A．Yellow dwarf, white dwarf, red giant, black giant.

B．Red giant, white dwarf, red dwarf, nova explosion.

C．Yellow dwarf, red giant, white dwarf, black dwarf.

D．White dwarf, red giant, black dwarf, yellow dwarf.
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