请教OG-101

dadada007

看过别人的讨论，但是没明白：http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=63725

101.

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) 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.

101.

Algae whose rate of photosynthesis varies on a 24-hour basis even when they are under constant light constitute evidence against the hypothesis that it is alterations in light that control biological cycles. Therefore choice E is the best answer.

Choices A and B describe biological cycles, but provide no evidence about what controls them. Choice C says that cycles can become adapted to new patterns of light, weakly supporting the hypothesis that alterations in light control cycles. Finally, choice D provides evidence against a different hypothesis, namely, that it is the cell nucleus of single-cell plants that controls their biological cycles.

题目的结论关键一句话是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.

--就是在有光线下的不段变更，是控制这些每天的生物节奏刺激物。但是有很多证据都与这个猜想有矛盾。那不是只要有题目反驳这个不就行拉，我开始选B的，因为B说动物都可以在黑夜（无光线下）活动，那么就是他们都可以在黑夜里controls these daily biological rhythms，不需要光线都可以，不是选这个么？

而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.即使暴露在光线中海藻在白天下的光合作用比在黑夜里的大。其实是支持结论啊，因为都是说有光线才可以CONTROL|！

请哪位NN指教！

hawkinsxie

题目：动植物呈现24小时的日周期性 ==〉 光照造成了这种情况。

则，为了命题成立，需要架桥，光照是24小时变化的唯一（至少是主要）变化。

所以，反驳它，就把桥拆了。E中algae即使是24小时不停日照，即无变化，也呈现日周期。自然就选E了。

B，不同的动物显示不同的日周期，显然无关。

蜡笔小西

假设是说生物的生物节律由光线控制，光强即强，光弱即弱。WEAKEN时应该直接攻击光线，即找出不受光线控制的例子。

E选项指出海藻在昼夜不停around the clock的强光下仍然有自己的光合作用节奏--白天快晚上弱，说明光线并不是主导因素，生物仍然有其自己的规律。

B选项只是举例说明ROBIN，MICE在不同的时段有不同的活动频率，没有指出相关影响他们代谢的原因（比如光线），对题干的假设并不构成削弱。

供参考。

dadada007

哦，关键是不是alteration和constant呢？而B没有任何light的说明，是无关项？

po_po72

Choices A and B describe biological cycles, but provide no evidence about what controls them.

我认为AB说明了控制行为的是日照，因为人体温度改变是在早上和下午，动物有不同的活跃时间 分白天和早上，这都有光的强度的变化

下午比上午日照要厉害 所以体温不一样

动物的行为受日光影响 所以有的喜欢白天活动 有的喜欢晚上

OG的接受说没有说明什么控制了他们   我觉的有问题

大家的意见呢

jennyb

hawkinsxie解释的真好

KATIEUS

ppjelly

这题我也做错了，我选了B。仔细分析一下错误原因：
1）原文：光照密度的改变--》是控制生物节奏的因素，简化：改变--》因素，所以weaken题应该是拆桥或他因。
2）选B是因为把原文想当然的理解为：光照越多--》生物活动越多，这是原文没有提供的信息哦。所以选了B的可能就是像我这个理解的。哈哈。

刚刚开始做OG，CR比想象的难很多，差！说的不对处，多探讨。

helenzane

kevin070707

以下是引用dadada007在2005-3-13 12:10:00的发言：

看过别人的讨论，但是没明白：http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=63725

101.

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) 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.

101.

Algae whose rate of photosynthesis varies on a 24-hour basis even when they are under constant light constitute evidence against the hypothesis that it is alterations in light that control biological cycles. Therefore choice E is the best answer.

Choices A and B describe biological cycles, but provide no evidence about what controls them. Choice C says that cycles can become adapted to new patterns of light, weakly supporting the hypothesis that alterations in light control cycles. Finally, choice D provides evidence against a different hypothesis, namely, that it is the cell nucleus of single-cell plants that controls their biological cycles.

题目的结论关键一句话是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.

--就是在有光线下的不段变更，是控制这些每天的生物节奏刺激物。但是有很多证据都与这个猜想有矛盾。那不是只要有题目反驳这个不就行拉，我开始选B的，因为B说动物都可以在黑夜（无光线下）活动，那么就是他们都可以在黑夜里controls these daily biological rhythms，不需要光线都可以，不是选这个么？

而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.即使暴露在光线中海藻在白天下的光合作用比在黑夜里的大。其实是支持结论啊，因为都是说有光线才可以CONTROL|！

请哪位NN指教！

A: repeatly 24H ; B light control rhythms

A->B

weaken 即 非A 或者 他因。

E 一个单词决定了它是正确答案，constant 。