- 2016年05月09日13:29 来源：小站整理
- 参与（10） 阅读（4208）
Anaerobicglycolysis is a process in which energy is produced, without oxygen, through the breakdown of muscle glycogeninto lactic acid and adenosine triphosphate (ATP), the energy provider. The amount of energy that can be produced anaerobically is a function of theamount of glycogen present—in all vertebrates about 0.5 percent of their muscles’ wet weight. Thus the anaerobic energy reserves of a vertebrate areproportional to the size of the animal. If, for example, some predators had attacked a 100-ton dinosaur, normally torpid, the dinosaur would have beenable to generate almost instantaneously, via anaerobic glycolysis, the energy of 3,000 humans at maximum oxidative metabolic energy production.
The passage‘s suggestion that the total anaerobic energy reserves of avertebrate are proportional to the vertebrate's size is based on which of the following assumption?
(A) larger vertebrates 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
(E) the size of a vertebrate is proportional to the quantity of energy it can utilize
文本是关于无氧糖酵解产生能量的过程，且提出动物体积越大，所产生的能量储备也就越多。以恐龙为例，说明其遭遇攻击所能产生的能量之巨大。题干中问“the total anaerobic energy reserves of a vertebrate are proportionalto the vertebrate’s size”这一论点是根据哪一条假定推断出来的，通读选项不难得出E。
Although passenger pigeons, now extinct, were abundant in eighteenth-and nineteenth-century America, archaeological studies at twelfth-century Cahokian sites in the present-day United States examined household food trash and found that traces of passenger pigeon were quite rare. Given that the sites were close to a huge passenger pigeon roost documented by John James Audubon in the nineteenth century and that Cahokians consumed almost every other animal protein source available, the archaeologist conducting the studies concluded the passenger pigeon population had once been very limited before increasing dramatically in post-Columbian America. Other archaeologists have criticizedthose conclusions on the grounds that passenger pigeon bones would not belikely to be preserved. But all the archaeological projects found plenty ofbird bones--and even some tiny bones from fish.
The author of the passage mentions "tiny bones from fish" primarily in order to
A. Explain why traces of passenger pigeon are rare at Cahokian sites
B. Support a claim about the wide variety of animal proteins in the Cahokian diet
C. Provide evidence that confirms a theory about the extinction of the passenger pigeon
D. Cast doubt on the conclusion reached by the archaeologists who conducted the studies discussed inthe passage
E. Counter an objection to an interpretation of the data obtained from Cahokian sites
定位至文中最后一行，句子跟在转折连词But后，But all the archaeological projects found plenty of bird bones--andeven some tiny bones from fish，与之前提及的passenger pigeonbones would not be likely to be preserved意思相反。