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A. division B. sufficient C. constant D. depths E. exterior F. whereas G. stable H. proved I. external J. measuring K. environme
A. division B. sufficient C. constant D. depths E. exterior F. whereas G. stable H. proved I. external J. measuring K. environme
admin
2017-02-18
45
问题
A. division B. sufficient C. constant D. depths E. exterior
F. whereas G. stable H. proved I. external J. measuring
K. environment L. inadequate M. making N. bottom O. characterizing
For centuries it has been recognized that mammals and birds differ from other animals in the way they regulate body temperature. Ways of【C1】______ the difference have become more accurate and meaningful over time, but popular terminology still reflects the old【C2】______into "warm blooded" and "cold blooded" species; warm blooded included mammals and birds, 【C3】______all other creatures were considered cold blooded. As more species were studied, it became evident that this classification was【C4】______. A fence lizard usually has a body temperature only a degree or two below that of humans and so is not cold. Therefore the next distinction was made between animals that maintain a【C5】______body temperature and those whose body temperature varies with their environment. But this classification also【C6】______inadequate, because among mammals there are many that vary their body temperatures during hibernation. Furthermore, many invertebrates that live in the【C7】______of the ocean never experience a change in the chill of the deep water, and their body temperatures remain constant. The current distinction is between animals whose body temperature is regulated chiefly by internal metabolic processes and those whose temperature is regulated by the【C8】______. The latter do so mainly by moving to favorable sites or by changing their exposure to【C9】______ sources of heat. Mammals and birds also regulate their temperature by choosing favorable environments, but primarily they regulate their temperature by【C10】______a variety of internal adjustments.
【C5】
选项
答案
C
解析
空格前的a和后面的名词短语表明,此处需要填入修饰body temperature的词。本句讲到人们进一步把动物分为两类,根据本句的关键词varies with“随……而变化”可知此处需要填入一个与之意思相反的词。constant“不变的;始终如一的”符合语义。stable表示状态稳定,此处表达的是“恒定不变”的概念,故排除。
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0
专业英语四级
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