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It has long been known that the rate of oxidative metabolism (the process that uses oxygen to convert food into energy) in any animal has a profound effect on its living patterns. The high metabolic rate of small animals， for example， gives them sustained power and activity per unit of weight， but at the cost of requiring constant consumption of food and water. Very large animals， with their relatively
low metabolic rates， can survive well on a sporadic food supply， but can gen- erate little metabolic energy per gram
of body weight. If only oxidative metabolic rate is considered， there- fore， one might assume that smaller，
more active， animals could prey on larger ones， at least if they attacked in groups. Perhaps they could if it were not
for anaerobic glycolysis， the great equalizer.
Anaerobic glcolysis is a process in which energy is produced， without oxygen， through the breakdown of muscle glycogen into lactic acid and adenosine tri- phosphate (ATP)，the energy provider. The amount of energy that can be
produced anaerobically is a function of the amount of
glycogen present-in all vertebrates about 0.5 percent of
their muscles' wet weight. Thus the anaerobic energy reserves of a verte- brate are proportional to the size of the animal. If， for example， some predators had attacked a 100-ton dinosaur， normally torpid， the dinosaur would have been
able to generate almost instantaneously， via anaerobic glycolysis， the energy of 3，000 humans at maximum oxidative metabolic energy production. This explains how many large species have managed to compete with their more active
neighbors： the compensation for a low oxidative metabolic
rate is glycolysis.
There are limitations， however， to this compensa- tion. The glycogen reserves of any animal are good， at most， for only about two minutes at maximum effort， after which only
the normal oxidative metabolic source of energy remains. With the conclusion of a burst of activity， the lactic acid level is high in the body fluids， leaving the large animal vulnerable to attack until the acid is reconverted， via oxidative metabolism， by the liver into glucose， which is then sent (in part) back to the muscles for glycogen resyn- thesis. During this process the enormous energy debt that the animal has run up through anaerobic glycolysis must be repaid，a debt that is proportionally much greater for the larger vertebrates than for the smaller ones. Whereas the tiny shrew can replace in minutes the glycogen used for maximum effort，for example， the gigantic dinosaur would have required more than three weeks. It might seem that this inter- minably long recovery time in a large vertebrate would prove a grave disadvantage for survival. Fortunately， muscle glycogen is used only when needed and even then only in whatever quantity is necessary. Only in times of panic or during mortal combat would the entire reserves be consumed.
1. What is the text mainly about?。
[A] refute a misconception about anaerobic glycolysis.
[B] introduce a new hypothesis about anaerobic glycolysis.
[C] describe the limitations of anaerobic glycolysis.
[D] explain anaerobic glycolysis and its effects on animal survival.
2. According to the author， glycogen is crucial to the process of anaerobic glyrolysis because glycogen
[A] increases the organism‘s need for ATP.
[B] reduces the amount of ATP in the tissues.
[C] is an inhibitor of the oxidative metabolic production of ATP.
[D] is the material form which ATP is derived.
3. It is implied that the total anaerobic energy reserves of a vertebrate are proportional to its size because
[A] larger vertebrate conserve more energy than smaller vertebrates.
[B] larger vertebrates use less oxygen per unit weight than smaller vertebrates.
[C] the ability of a vertebrate to consume food is a function of its size.
[D]the amount of muscle tissue in a vertebrate is
directly related to its size，
4. According to the text， a major limitation of anaerobic glycolysis is that it can
[A] produce in large animals more lactic acid than the liver can safely reconvert.
[B] necessitate a dangerously long recovery period in large animals.
[C] reduce energy more slowly than it can be used by large animals.
[D]consume all of the available glycogen regardless of need.
5. Which of the following audiences is the author most probably addressing?
[A] College students in an introductory course on animal physiology.
[B] Historians of science investigating the discovery of anaerobic glycolysis.
[C] Graduate students with specialized training in comparative anatomy.
[D] Zoologists interested in prehistoric animals.
参考答案：
1. D 主旨题。本题的问题是“本文主要是关于什么?”文章第一段首先提到动物的氧化新陈代谢率对其生存方式造成的影响，随后引出了无氧糖酵解这个概念;第二段解释了无氧糖酵解，第三段介绍了无氧糖酵解的局限性以及对动物的生存产生的影响。这说明[D]“解释无氧糖酵解及其对动物生存产生的影响”能够表达本文的主题，为准确答案。文中没有提到相关无氧糖酵解的错误观点和新假说，所以[A]“反驳相关无氧糖酵解的一个错误概念”和[B]“介绍相关无氧糖酵解的一种新假说”属于无中生有;[C]“描述无氧糖酵解的局限性”仅仅第三段的内容，比较片面，不能表达本文的主题。
2. D 细节题。本题的问题是“根据作者的观点，糖原质对于无氧
糖酵解的过程至关重要。因为糖原质——”。题干中的“glycogen”
出自文章第二段第一句话中，表明本题与第二段相关。第二段在解释
无氧糖酵解时提到，无氧糖酵解能够产生能量是糖原质存有的作用，
其能量是由、肌糖原质分解成乳酸和三磷酸腺苷而产生的，而能量的
供应者是三磷酸腺苷。这说明，糖原质是无氧糖酵解的能量来源，也
就是三磷酸腺苷的来源。[D]“是从中获得三磷酸腺苷的物质”是对文
章第二段中“through the breakdown of muscle glycogen into
lactic acid and adenosine triphosphate(ATP)”这句话的改写，为
准确答案。文中没有提到增大三磷酸腺苷的需求和降低其含量的问题，所以[A]“增大了生物体对三磷酸腺苷的需求”和[B]“降低了组织中
三磷酸腺苷的含量”属于无中生有;[C]“是三磷酸腺苷的氧化新陈代
谢生产的抑制者”与文意相反。
3. D 推论题。本题的问题是“文中暗示，脊椎动物的总无氧能源
储备与其体型大小相称，因为”。题干中的“are p roportional to
its size”出自文章第二段第三句话中，表明本题与第二段相关。第
二段提到，糖原质大约占脊椎动物肌肉净重的0.5%，所以脊椎动物的
无氧性能量储存同其体型的大小相称;随后列举的恐龙例if-解释了其
中的原翻：因为恐龙的体型庞大，所以它能够通过无氧糖酵解在瞬间
产生很大的能量。由此可知。肌肉越多，糖原质的含量就越多，而只
有体型越大，肌肉才越多。[D]“脊椎动物体内的肌肉组织量同其体型
大小直接相关”是对文章第二段中“the anaerobic energy reserves of a vertebrate are proportional to the size of the animal”
这句话的改写，为准确答案。[A]“较大的脊椎动物储备的能量比较小
的脊椎动物多”是针对文中“the anaerobic energy reserves of a vertebrate are proportional to the size of the animal”这句话
设置的干扰项。而文中说的是脊椎动物的无氧性能量储存，并不是脊
椎动物储备的能量，属于偷换概念，所以不对;文中只提到了消耗食物
和水的问题，没有提到消耗氧气的问题，所以[B]“较大的脊椎动物每
单位体重消耗的氧气比较小的脊椎动物少”属于偷换概念;[C]“脊椎
动物消耗食物的水平是其体型的作用”是对文中“The amount of energy that can be produced anaerobically is a functi0n of
the amount of glycogen present”这句话的篡改，与文意不符。
4. B 细节题。本题的问题是“根据本文的观点，无氧糖酵解的一
个主要局限性就是，‘它能够”。题干中的“limitation”出自文章
第三段第一句话中，表明本题与第三段相关。第三段解释了补偿的局
限性，指出，动物因为无氧糖酵解所导致的大量能量消耗必须得到补偿;随后举例说，小地鼠在几分钟内就能补偿其最剧烈运动所消耗的糖
原质。但体型庞大的恐龙却需要三个多星期才能完成补偿。这说明，
其主要局限性就是大型动物的补偿期时间长。[B]“使大型动物必须有
长时间的补偿期”是对文中“the gigantic dinosaur would have required more than three weeks”这句话的改写，为准确答案。文
中提到“reconvert”时是说“一阵剧烈运动结束后，体液中乳酸的含
量就高，这使得大型动物容易受到攻击，直到乳酸通过氧化新陈代谢
由肝脏再次转化成葡萄糖”，说明[A]“在大型动物体内生产的乳酸比
肝脏能够再次转化的乳酸多”属于偷换概念;[C]“使能量减少的速度
慢于大型动物使用能量的速度”与文意相反;[D]“消耗所有能够利用
的糖原质，不管需不需要”与第三段最后一句话的意思不符。
5. A 推论题。本文的问题是“作者最可能针对下面哪类听众发表
演说?”作者主要是介绍无氧糖酵解对动物的生存产生的影响，他的解
释清楚易懂，没有提到深奥难懂的知识。由此可知，作者最可能是针
对初学动物学的学生这类读者。[A]“动物生理学入门课的大学生”为
准确答案。本文仅仅提到了无氧糖酵解，没有介绍如何发现它，并且
所介绍的知识并不深奥，所以[B]“研究无氧糖酵解发现的历史科学家”不可能是作者针对的听众;本文并没有提到解剖学方面的知识，所以[C]“专业研究比较解剖学的研究生”属于无中生有;本文列举恐龙的
例子仅仅为了说明无氧性能量储存同动物体型的大小相称这个问题，
并没有提到其他史前动物，不可能吸引对史前动物感兴趣的动物学家，所以[D]“对史前动物感兴趣的动物学家”不可能是作者针对的听众。
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2014考研英语阅读冲刺练习模拟测试 及答案(3) Passage Those who welcomed the railway saw it as more than a rapid and comfortable means of passing. They actually saw it as afactor in world peace. They did not foresee that the railway would be just one more means for the rapid movement of aggressive armies. None of them foresaw that the more weare together-the more chances there are of war. Any boy or girl who is one of a large family knows that. Whenever any new invention is put forward, those for it and those against it can always find medical men to approve or condemn. The anti-railway group produced doctors who said that tunnels would be most dangerous to public health: they would produce colds, catarrhs (粘膜炎) and consumptions. The deafening noise and the glare of the engine fire, would have a bad effect on the nerves. Further, being moved through the air at a high speed would do grave injury to delicate lungs. In those with high blood-pressure, the movement of the train might produce apoplexy (中风). The sudden plunging of a train into the darkness of a tunnel, and the equally sudden rush into full daylight, would cause great damage to eyesight. But the pro-railway group was of course able to produce equally famous medical men to say just the opposite. They said that the speed and swing of the train would equalize the circulation, promote digestion, tranquilize the nerves, and ensure good sleep. The actual rolling-stock was anything but comfortable. If it was a test of endurance to sit for four hours outside a coach in rain, or inside in dirty air, the railway offered little more in the way of comfort. Certainly the first-class carriages had cushioned seats; but the second-class had only narrow bare boards, while the third-class had nothing at all; no seats and no roof; they were just open trucks. So that third-class passengers gained nothing from the few mode except speed. In the matter of comfort, indeed they lost; they did, on the coaches, have a seat, but now they had to stand all the way, which gave opportunities to the comic (滑