请贴出题目和选项
注明题号
题目如下：
72. Biological functions of many plants and animals vary in cycles that are repeated every 24 hours. It is tempting to suppose that alteration in the intensity of incident light is the stimulus that controls these daily biological rhythms. But there is much evidence to contradict this hypothesis.
Which of the following, if known, is evidence that contradicts the hypothesis stated in lines 2-5 above?
(A) Human body temperature varies throughout the day, with the maximum occurring in the late afternoon and the minimum in the morning.
(B) While some animals, such as the robin, are more active during the day, others, such as mice, show greater activity at night.
(C)
。。。。。。
题目注释：
A No reason is given to explain the variation of human body temperature throughout the day;this statement is irrelevant to the hypothesis.
B No cause is given for the varied activity cycles of different animals;this statement is irrelevant to the hypothesis.
我的问题在上面说了，就是A和B的前半段解释没看懂。请高手指点，先谢了！
题目要求的是weaken文中的假设
假设是:intensity of incident light is the stimulus that controls these daily biological rhythms. 光的强度是一种刺激物控制着生物节律
A：体温。文章的hypothesis是光的强度控制着生物节律。我们要找一个光未必控制着生物节律，或者是有其它东西控制着生物节律。体温的变化和题目无关。we are talking about light and biological rhythms。
B：有些动物白天运动，有些动物晚上运动。为何不同的动物会有不同的rhythms不是文章讨论的重点。文章在讨论光和生物节律的关系。所以也是无关的。
－－－－－－－－－
if known means 以下的事实是真的，只是告诉你一个事实，找一个能最大程度上反驳hypothesis的即可。题目的hypothesis已经给出了一个假设的原因。我们需要找一个事实，证明这个原因是错误的。换句话说，这样的假设的原因未必能得出想要的事实即可。
我理解的OG的意思是：选项AB只给出了daily biological rhythms的两个例子，但并没有给出是什么原因，no reason is given to explain,所以构不成削弱，如果说这两个例子(人的体温变化和动物的活动时间不同)是由light intensity变化引起的，也就可以成为正确选项了；
单从两个句子所涉及的内容来说与假设无关
这个题，我很晕。。
A。 人体温度不同，傍晚温度高，早上温度低---可否理解为：傍晚就是没有光或者光的强度弱，体温高，早上有光，体温低。这不也是生物节律与光有关吗？
E应该怎么翻译even when exposed to constant light intensity around the clock?
谢谢
跟楼上理解的相同,有没有牛牛在把这题五个选项详细的说说
(A) Human body temperature varies throughout the day, with the maximum occurring in the late afternoon and the minimum in the morning.
(B) While some animals, such as the robin, are more active during the day, others, such as mice, show greater activity at night.
(C) When people move from one time zone to another, their daily biological rhythms adjust in a matter of days to the periods of sunlight and darkness in the new zone.
(D) Certain single-cell plants display daily biological rhythms even when the part of the cell containing the nucleus is removed.
(E) Even when exposed to constant light intensity around the clock, some algae display rates of photosynthesis that are much greater during daylight hours than at night.
现在想清楚这个问题：
题目： 动植物都有生物钟，
结论： 这种生物钟的改变主要是光的强度的改变控制这个生物钟24小时的循环。
A 错， 问题不是推论inference，而是削弱weaken，我前面的一个设想是在推论，A谈论的光的强度影响rhythms的问题，温度的问题应该是无关选项，理解楼上gonghao的回答了
B 错， 举出2中相反规律的例子， (而且介绍的activity ,并不是rhymthms,可以考虑无关选项)并没有说明削弱，也没有说明支持，有点中立的态度。
C错，支持了原文的结论，换time zone, 又很快调整了白天和晚上的时区。
D 错，无关， remove nucleus 单细胞植物还保持rhymthms ，那也不能排除其他的器官影响，问什么就能说是光的轻度的关系呢
E 正确，
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