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【单选题】
下列关于稳态概念的叙述，错误的是A.
内环境理化性质保持相对稳定状态称为稳态
B.
稳态是维持细胞正常生存和活动的必要条件
C.
细胞的生存要求内环境理化特性保持相对稳定
D.
正反馈调节是维持稳态的重要途径
E.
内环境稳态的破坏会导致许多疾病
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【简答题】We have in the past ________ that we have y not only of the land but of the sea... We have not. Life goes on there just as it did from the ________.
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【简答题】人体缺乏会导致坏血病的维生素是 ;人体缺乏会导致脚气病的维生素是 。
【简答题】人体缺乏会导致坏血病的维生素是 ;人体缺乏会导致脚气病的维生素是 。
【简答题】人体缺乏会导致坏血病的维生素是 ;人体缺乏会导致脚气病的维生素是 。
【单选题】The main idea of the first part: 1 In 1953, on the heels of a discovery of a second coelacanth specimen in the Comoros Islands off Madagascar’s coast, J.L.B. Smith, the man who described the species, ...
A.
Man’s influence is as yet but a passing shadow.
B.
But unable to observe them alive in their deep sea home, we have understood very little about how they live, where they live and how they behave.
C.
But it is a drop in the vast ocean-sized bucket of amazing discoveries waiting to be made.
D.
Man is far from having control of the ocean. We know very little about it, and the discoveries we have made, though monumental, are but a drop in an ocean-sized bucket.
【单选题】Which of the following statements is true according to the passive?
A.
We have about the same amount of passive sleep and active sleep.
B.
We usually have less passive sleep than active sleep.
C.
Passive sleep is often followed by active sleep.
D.
Passive sleep comes after active sleep.
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