问题 单项选择题

关于下列激素反馈系统哪项只有正反馈()

A.下丘脑-垂体-性腺轴

B.肾素-血管紧张素-醛固酮

C.下丘脑-垂体-肾上腺轴

D.下丘脑-垂体-甲状腺轴

E.甲状旁腺素-血钙

答案

参考答案:A

单项选择题

Every group has a culture, however uncivilized it may seem to us. To the professional anthropologist, there is no intrinsic superiority of one culture over another, just as to the professional linguist, there is no intrinsic hierarchy among languages.
People once thought of the languages of backward groups as undeveloped. While it is possible that language in general began as a series of grunts and groans, it is a fact established by the study of "backward" languages that no spoken tongue answers that description today. Most languages of uncivilized groups are, by our most severe standards, extremely complex. They differ from Western languages not in their sound patterns or grammatical structures, which usually are fully adequate for all language needs, but only in their vocabularies, which reflect the objects and activities known to their speakers. Even in this aspect, two things are to be noted. First, all languages seem to possess the machinery for vocabulary expansion, either by putting together words already in existence or by borrowing them from other languages and adapting them to their own system. Second, the objects and activities requiring names and distinctions in "backward" languages, while different from the West, are often surprisingly numerous and complicated. A Western language distinguishes merely between two degrees of remoteness ("this" and "that"). But some languages of the American Indians distinguish between what is close to the speaker, or to the person addressed, or removed from both, or out of sight, or in the past, or in the future.

The author’s attitude shown in this passage toward "backward" languages is______.

A.restrained

B.subjective

C.objective

D.resolute

多项选择题