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1、欢迎您阅读并下载本文档，本文档来源于互联网，如有侵权请联系删除！我们将竭诚为您提供优质的文档！2021 年 GRE 考试阅读理解测试题及答案 Many researchers attribute the large number of physiological and behavioral similarities between birds and mammals,which have separate evolutionary histories,to endothermy(a thermoregulatory strategy whereby warm body temperature
2、 is maintained through internal heat sources).However,Farmer argues that parental care rather than endothermy is the key to understanding the similarities between mammals and birds.According to Farmer,while endothermy provides an explanation for a few similarities,such as the presence of body insula
3、tion,endothermy is just one characteristic among many related to parental care.The two purported advantages of endothermy that have been most frequently cited by researchers are an expanded range of inhabitable environments and the ability to sustain vigorous exercise.But metabolism has to increase
4、substantially(at great energy cost)therefore conferring any significant thermoregulatory advantage in terms of the former,and there is no causal biological linkage to explain why endothermy would be essential to sustain exercise.Farmer argues instead that endothermy evolved as a means to control inc
5、ubation temperature and that the 欢迎您阅读并下载本文档，本文档来源于互联网，如有侵权请联系删除！我们将竭诚为您提供优质的文档！ability to sustain exercise evolved separately,as a means to improve a parents ability to forage and provision its young.1.The primary purpose of the passage is to A.present a scientific theory that challenges a widely h
6、eld theory B.summarize the basis for a large body of scientific research C.defend an established scientific theory in light of recent criticism D.express skepticism about the results obtained by a particular researcher E.compare the results of two particular scientific studies 2.Which of the followi
7、ng best characterizes the organization of the passage as a whole?欢迎您阅读并下载本文档，本文档来源于互联网，如有侵权请联系删除！我们将竭诚为您提供优质的文档！A.A position is noted,an alternative to that position is introduced,and then several points in support of the alternative are discussed.B.A theory is discussed,an inconsistency within that
8、 theory is illustrated,and then a recommendation is made for further inquiry.C.Certain research results are described,the significance of those results is explained,and then a novel interpretation of those results is summarized.D.A question is posed,a possible answer to that question is suggested,an
9、d then evidence is provided to corroborate that answer.E.A debate is outlined,contrasting viewpoints within the debate are discussed,and then one viewpoint is demonstrated to be correct.3.According to the passage,Farmer concedes that endothermy provides an explanation for which of the following features shared by birds and mammals?A.The ability to forage 欢迎您阅读并下载本文档，本文档来源于互联网，如有侵权请联系删除！我们将竭诚为您提供优质的文档！B.The ability to sustain exercise C.The instinct to care for offspring D.Flexibility in habitat usage E.Body insulation 答案：A A E