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
31
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] 【C13】
选项
A、warm
B、constant
C、stable
D、cold
答案
B
解析
本句讲到人们进一步把动物分为两类,根据本句的关键词varied可知本空需要一个与之意思相反的词来显示动物类别不同。故答案缩小于选项B和C之间,而46题所在句的constant一词有助于排除选项C,故选项B正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3189752.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
Manyyoungpeopledoubtthattheirdreamsforthegoodlifecouldevercometrue
[originaltext]M:Excuseme.I’mhavingtroublehearinginthebackoftheroom.
下列命题中()是由董仲舒提出的。A.“天不变道亦不变” B.“天行有常,不为尧
阅读材料,完成题。 《鱼我所欲也》原文 鱼,我所欲也;熊掌,亦我所欲也。
大学生的品德的形成与发展是社会需要与个人需要的辩证统一。
失业率的计算公式是()。A:失业人数÷(就业人数+失业人数)×100% B:
急性化脓性胆囊炎可行A.胆囊造口术 B.胆囊切除术 C.胆囊切除术,胆总管探
甲乙两国均为《维也纳外交关系公约》和《维也纳领事关系公约》的缔约国,汤姆为甲国派
"生痰之源"是指A.肺 B.心 C.肝 D.脾 E.肾
男,32岁。后背及双上臂沸水烫伤4小时。查体:T37.4℃,P100次/分,R2
最新回复
(
0
)