首页
登录
职称英语
Cells cannot remain alive outside certain limits of temperature, and much n
Cells cannot remain alive outside certain limits of temperature, and much n
游客
2023-11-15
28
管理
问题
Cells cannot remain alive outside certain limits of temperature, and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow 【C1】______ around 37℃; a 【C2】______ , of a few degrees from this value seriously impairs their functioning. Even though cells can survive wider 【C3】______ , the integrated actions of bodily systems are impaired. Other animals have a wider tolerance 【C4】______ changes of bodily temperature.
For centuries 【C5】______ has been recognized that mammals and birds differ from other animals in the way they regulate body temperature. Ways of 【C6】______ the difference have become more accurate and meaningful over time, but popular terminology still reflects the old division 【C7】______ " warm blooded" and "cold blood- ed " species; warm blooded included mammals and birds, 【C8】______ all other creatures were considered cold blooded. 【C9】______ more species were studied, it became evident that this classification was 【C10】______ A fence lizard usually has a body temperature only a degree or two below 【C11】______ of humans and so is not cold. 【C12】______ the next distinction was made between animals that maintain a 【C13】______ body temperature and those whose body temperature varies with their environment. But this classification also proved inadequate, 【C14】______ among mammals there are many that vary their body temperatures during hibernation. 【C15】______ many invertebrates that live in the 【C16】______ 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 【C17】______ chiefly by internal metabolic processes and those whose temperature is regulated by the 【C18】______ . The latter do so mainly by moving to favorable sites or by changing their exposure to 【C19】______ sources of heat. Mammals and birds also regulate their temperature by choosing favorable environments, but primarily they regulate their temperature by making a variety of internal 【C20】______ . [br] 【C19】
选项
A、various
B、external
C、environmental
D、exterior
答案
B
解析
结合前句中的internal可知此处词义应与之相对,故应选extemal。
转载请注明原文地址:https://tihaiku.com/zcyy/3189758.html
相关试题推荐
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
随机试题
BuildYourSelf-confidence1.【T1】______fearSelf-confidence≠【T2】______Fea
AresearchpresentedtotheAAASmeetinginSanDiegosuggeststhatmuchof
When_______,thebridgeconnectingtheislandtothecontinentwillbeopento
吴茱萸汤中包含的药物组是A.吴茱萸、人参、白术 B.人参、大枣、生姜 C.吴
1.变电运维室(分部)和班组应每()对计划执行情况进行检查,提高运维
()对人际接触和交往频繁的工作岗位尤其重要。A:结果性效标 B:特征性效标
五年一班全体学生42人开展第二课堂活动,他们从学校大队部借来图书222本,规定每
关于固定资产清查,下列说法中不正确的是()。A.盘盈固定资产应作为前期差错处理
某市为了科学准确地分析本市的安全生产状况,组织各生产经营单位开展生产安全事故统计
阻塞性肺气肿支气管炎型的临床表现,下列哪项是正确的() A.发病年龄较轻 B
最新回复
(
0
)