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OG18官方指南,建议同学们刷3遍。第一遍做题了解题型和考点,第二遍精刷,第三遍集中解决疑难问题。建议考生第一遍刷题采用官方正版纸质书籍,若遇到疑难问题,欢迎在此专区查阅解析,提供解析,参与题目讨论,与所有考生一起解决疑难问题。
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Scientists long believed that two nerve clusters in the human hypothalamus, called suprachiasmatic nuclei (SCNs), were what controlled our circadian rhythms. Those rhythms are the biological cycles that recur approximately every 24 hours in synchronization with the cycle of sunlight and darkness caused by Earth’s rotation. Studies have demonstrated that in some animals, the SCNs control daily fluctuations in blood pressure, body temperature, activity level, and alertness, as well as the nighttime release of the sleep-promoting agent melatonin. Furthermore, cells in the human retina dedicated to transmitting information about light levels to the SCNs have recently been discovered.

Four critical genes governing circadian cycles have been found to be active in every tissue, however, not just the SCNs, of flies, mice, and humans. In addition, when laboratory rats that usually ate at will were fed only once a day, peak activity of a clock gene in their livers shifted by 12 hours, whereas the same clock gene in the SCNs remained synchronized with light cycles. While scientists do not dispute the role of the SCNs in controlling core functions such as the regulation of body temperature and blood pressure, scientists now believe that circadian clocks in other organs and tissues may respond to external cues other than light—including temperature changes—that recur regularly every 24 hours.

【OG20-P399-463题】

The author of the passage would probably agree with which of the following statements about the SCNs?

  • 分析A选项
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  • 分析B选项
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  • 分析C选项
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  • 分析D选项
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  • 分析E选项
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该题目由网友KVUK6h4提供。更多GMAT题目请
暂无雷哥网文字解析
当前版本由 感觉自己萌萌哒 更新于2015-10-29 17:37:39 感谢由 感觉自己萌萌哒 对此题目的解答所做出的贡献。
10.The author of the passage would probably agree with which of the following
statements about the SCNs?(一般细节题 , 根据选项关键词回文定位)

(A) The SCNs are found in other organs and tissues of the body besides the
hypothalamus.(与文章内容不符:SCN和other organs and tissues是地位平等的存在,不可能在一个器官里面藏着其他器官
(B) The SCNs play a critical but not exclusive role in regulating circadian
rhythms.(第3结构,正确)
(C) The SCNs control clock genes in a number of tissues and organs
throughout the body.(与文章内容不符 SCN控制SCN里面的genes,其他tissues and organs控制的是他们内的genes,没有交叉控制)

(D) The SCNs are a less significant factor in regulating blood pressure than
scientists once believed.(第3结构 与层次逻辑意思相反)
(E) The SCNs are less strongly affected by changes in light levels than they
are by other external cues.(与文章内容不符,应该是more而不是less)
当前版本由 你是风儿 更新于2015-11-18 17:46:42 感谢由 你是风儿 对此题目的解答所做出的贡献。

A:文章没有提到SCNs在其他器官中也存在这个信息

B:由原文the SCNs control daily fluctuations in blood pressure, body temperature, activity level, and alertness, as well as the nighttime release of the sleeppromoting agent melatonin可以看出SCNs的作用在日常功能上,说明critical,由Furthermore可以看出不仅有一种作用

C:文章没有提到这个信息

D:原文提到 scientists do not dispute the role of the SCNs in controlling core functions ,说明科学家承认SCNs对控制血压的重要作用

E:与原文意思相反


题目讨论 7条评论)

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    nanhahaha

    毕出
    题目分析:
    
    文章推断题:作者可能同意以下哪个关于SCNs的观点?
    
    这道题看一遍会发现有的选项把文章中的一些点混在一起,比如A里面在其他地方发现的是genes而不是SCNs,误以为有原文可以对应的部分。但正确选项是需要搞清作者的意图,总结出来——SCNs不是唯一可以控制CR的,但不可否认它的重要性
    
    
    选项分析:
    
    
    A选项: 除了下丘脑,在其它器官、组织也发现了SCNs: 文章一开始提到了在下丘脑发现SCNs,但没有提到是否其它地方有。
    
    
    
    B选项:正确。SCNs在控制生物周期上起到关键但不是绝对作用:和文章叙述脉络一致——从认为SCNs独自调控到发现还有别的genes和SCNs一起调控。
    
    
    C选项:SCNs控制身体中许多器官的生物钟:文章中的小白鼠实验证明了有些器官不受SCNs控制。
    
    
    D选项:SCNs在调控血压方面没科学家想的那么重要:文章第二段提到“科学家不否认SCNs在调控血压方面的作用”。
    
    
    E选项:光线变化没有外部因素对SCNs影响大:文章说的是SCNs受光线影响,其他组织的生物钟可能受外部因素影响;未将二者比较。
    0 0 回复 2019-09-09 15:42:55
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    轻舟万重

    请问E为什么是相反的 我没看出来这个相反的关系
    0 0 回复 2019-08-04 18:17:07
    • 评论用户头像

      328042pjf回复轻舟万重

      whereas the same clock gene in the SCNs remained synchronized with light cycles

      0 0 回复 2019-08-21 09:18:07

  • 用户头像

    徐子涵

    联系整个第二段
    Four critical genes governing circadian cycles have been found to be active in every tissue, however, not just the SCNs, of flies, mice, and humans.
    四种关键的控制circadian cycle的基因存在于每一种组织里
    peak activity of a clock gene in their livers(肝脏) shifted by 12 hours, whereas the same clock gene in the SCNs remained synchronized with light cycles. 
    这句对比,可以说明SCN与organ的地位平等   所以A选项错误
    DE选项明显错误
    While scientists do not dispute the role of the SCNs in controlling core functions such as the regulation of body temperature and blood pressure, scientists now believe that circadian clocks in other organs and tissues may respond to external cues other than light
    根据这句话,可以得出每一个组织里的clock gene是由每个组织自己控制的
    并不是C选项所说的SCN控制所有组织和器官里的clock gene
    0 0 回复 2018-11-14 16:31:31
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    ( ¨̮ )

    While scientists do not dispute the role of the SCNs in controlling core functions such as the regulation of body temperature and blood pressure, scientists now believe that circadian clocks in other organs and tissues may respond to external cues other than light—including temperature changes—that recur regularly every 24 hours.
    0 0 回复 2018-08-06 23:21:27
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    mengdan

    注意,other tissu and organ和scns是并列的东西,gene各自存在里面,真的是看了五遍才懂,死亡了
    0 0 回复 2017-12-12 20:10:47
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    一米

    B选项可以参考第二段首句“Four critical genes governing circadian cycles have been found to be active in every tissue, however, not just the SCNs”每个组织里都有能调节昼夜节奏的genes,SCNs不是唯一的组织
    0 0 回复 2017-07-09 03:57:10
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    anna

    这篇reading够难的
    0 0 回复 2016-11-17 15:51:22
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