【OG20-P399-463题】The author of the passage would probably agree wit_OG17新题_-{$seo

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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?

A

The SCNs are found in other organs and tissues of the body besides the hypothalamus. 分析A选项
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B

The SCNs play a critical but not exclusive role in regulating circadian rhythms. 分析B选项
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C

The SCNs control clock genes in a number of tissues and organs throughout the body. 分析C选项
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D

The SCNs are a less significant factor in regulating blood pressure than scientists once believed. 分析D选项
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E

The SCNs are less strongly affected by changes in light levels than they are by other external cues. 分析E选项
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当前版本由 Edward. 更新于2021-04-09 16:44:44 感谢由 Edward. 对此题目的解答所做出的贡献。

A：没有提到其他地方是否有SCNs

B：第二段表示还有别的基因和SCNs一起调控生物周期

C：小白鼠实验证明了有些器官不受SCNs控制

D：第二段提到科学家不否认SCNs的作用

E：二者不存在比较

题目讨论（10条评论）

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ziqi

D并没有否认核心作用

0 0 回复 2022-03-23 16:53:59
贾思敏

1、 our critical genes governing circadian cycles have been found to be active in every tissue, however, not just the SCNs, of flies, mice, and humans. 2、有点被这一句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.迷惑了在B和D中犹豫，现在懂了，第二句那里人家是承认SCNs的重要性的，而且这个题是问作者的角度

0 1 回复 2021-11-20 23:26:26
水寒528

SCNs全文都有，所以只能依靠选项，来判断 A 张冠李戴，到处都有的不是SCNs而是4 个genes B 这篇文章的不是否定，而是提出改进，印个还有其他的可以控制，所以B SCNs 不是唯一正确 C 无中生有，SCN不是控制genes的 D 故意相反，While scientists do not dispute the role of the SCNs in controlling core functions such as the regulation of body temperature and blood pressure,并没有否定他在核心功能的作用，所以没有说他不重要，错误 E 无中生有，没有讨论影响程度谁和谁比较

1 0 回复 2021-10-01 15:44:07
Selina15回复水寒528

111

0 0 回复 2021-11-12 11:41:06
贾思敏

这个题其实就是考站在作者视角，关于SCNs的看法，我觉得重点是这一句：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.因为这里的however是对前面一段scientists视角的however，别人的观点后转折，也没表明是谁的观点，那就是作者的视角观点，别人的观点后转折通常就是给出新的观点和新的信息，这往往是GMAT阅读考的重点

0 0 回复 2021-09-27 15:47:26
朋友醒醒

circadian rhythms.昼夜节律

0 0 回复 2021-09-14 00:15:15
朋友醒醒回复朋友醒醒

exclusive 独家的

0 0 回复 2021-09-14 00:16:27

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 回复 2019-09-09 15:42:55

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
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

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

D选项根据While scientists do not dispute the role of the SCNs in controlling core functions such as the regulation of body temperature and blood pressure, 可以判断是错误的

E选项原文并没有这个比较。做GMAT题看到比较就需要谨慎

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 gen

0 回复 2018-11-14 16:33:10

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 回复 2018-11-14 16:31:31

( ¨̮ )

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