问题 单项选择题

在漫长的进化过程中,食物匮乏一直是人类面临的首要威胁。由于食物供应的不确定性和食物不能长期保留,人类一直过着饱一顿、饿几顿的生活,能够最大限度有效利用食物的个体具有生存优势。在经历了反复的饥荒选择后,具有生存优势的个体和他们体内的基因,就会通过自然选择的方式被保留下来。这些基因能在饱餐一顿后刺激大量分泌胰岛素,从而最大限度地转化利用血液中的葡萄糖。虽然这样做的代价是可能导致肥胖,但它对肌体的危害所造成的生存威胁,却直到中年后才会表现出来,而在人类历史的绝大部分时间里,人的平均寿命不到30岁。 这段文字意在说明:

A.古人的生存环境与现代人完全不同 

B.人类的生理结构是自然选择的结果 

C.食物匮乏是人类长期应对的首要问题 

D.肥胖与人类生存繁衍的优势基因相关

答案

参考答案:D

解析:

解析

根据提问方式得知本题为隐含主旨题。

文段前四句阐述了人类优势基因通过自然选择被保留下来的原理,最后一句隐含了主旨,通过“虽然”“但是”“却”“而”四个关联词,解释了前文所述的优势基因与肥胖之间的关系,和没有被淘汰的原因。D项最为准确地复述了这一主旨,故正确答案为D。

ABC三项表述正确,但均不是文段所要表达的主要意思,故排除。

考点:隐含主旨题

单项选择题
单项选择题

One reason many politicians behave badly these days is that we spend less time thinking about what it means to behave well. This was less of a problem in past centuries when leaders, teachers and clergy held detailed debates over what it meant to have good character.

In the 18th century, for example, Edmund Burke composed a long, famous passage defining the standards of political excellence. In the 19th century, Anthony Trollope wrote a series of popular novels fussing over what it means to behave well in political life. Trollope’s view was different than ours. Many Americans today assume that people are born with a good Inner Self but get corrupted by politics. American voters are always looking for the Innocent Outsider who can come in and bring sweeping change.

Trollope admired Prudent Insiders, not Innocent Outsiders. His most admirable characters have been educated by long experience. They have grown mature by exercising responsibility. They have been ennobled by custom and civilization. In his books, powerless outsiders often behave self-indulgently and irresponsibly. Those who are in government have to grapple with the world as it really is.

Trollope’s ideal politicians—who have names like Plantagenet Palliser, Joshua Monk and the Duke of St. Bungay put service before independence. Their party and their country have asked them to accept certain duties and face certain problems, and they just get on with it. They are more weighty, but also more boring.

Trollope’s ideal politicians share certain traits. They are reserved, prudent and scrupulous. They immerse themselves in dull practical questions like, say, converting the currency system. They are not sweeping thinkers, but they make sensitive discriminations about the people and the circumstances around them. They learn to operate within the constraints imposed by their idiom, and they don’t whine or complain about those constraints. They develop delicate understandings of what is required in a given place in time.

Trollope’s ideal leaders are not glamorous celebrities of the sort we have come to long for since J. F. Kennedy. They are more like seamen or carpenters. They are judged by their professional craftsmanship. They are thin-skinned about any moral transgression they might commit and rigorously honest when judging themselves. They try to make things better but are acutely aware that everything they do might make things worse. Trollope’s leaders don’t embrace change quickly but have to be dragged into embracing it after much interrogation, and the change they prefer is incremental.

Trollope praises one of his prime ministers, Plantagenet Palliser, for "that exquisite combination of conservatism and progress which is his country’s present strength and her best security for the future. " Trollope’s readers would have come away from his books with a certain model for how practical people should behave, which they could either copy or argue with. I’m not sure his exemplars could thrive amid the TV politics of today, which calls for grand promises and bold colors. But there are prudent, reserved people in government even now.

Towards today’s conservative leaders, the author’s attitude is()

A. critical

B.admirable

C. suspicious

D. tolerant