2021年事业单位招聘《公共基础知识》考试题库-综合知识／公共基础知识-人文历史常识-
职业资格-事业单位招聘
The human nose is an underrated tool.Humans are often thought to be insensitive smellers compared with animals,(1) _____ this is largely because, unlike animals, we stand upright.This means that our noses are (2) _____ to perceiving those smells which float through the air, missing the majority of smells which stick to surfaces.In fact, (3) _____, we are extremely sensitive to smells, even if we do not generally realize it.Our noses are capable of (4) _____ human smells when these are diluted to far below one part in one million. Strangely, some people find that they can smell one type of flower but not another, (5) _____ others are sensitive to the smells of both flowers.This may be because some people do not have the genes necessary to generate (6) _____ smell receptors in the nose.These receptors are the cells which sense smells and send (7) _____ to the brain.However, it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when (8) _____ to it often enough. The explanation for insensitivity to smell seems to be that the brain finds it (9) _____ to keep all smell receptors working all the time but can (10) _____ new receptors if necessary.This may also explain why we are not usually sensitive to our own smells-we do not need to be.
阅读理解
A.although
B.as
C.but
D.while
我个人认为这个应该是：C
解析：由前文“和动物相比，人类的嗅觉不灵敏”和后文“这只不过是因为人是直立的。”可知，空格处应该填入表示转折关系的词。although表示让步。as表示原因。but表示转折。while有时相当于although，显然不对；有时表示转折，常用来表示同一事件相对的两个方面，而空格前后的句子不是对比关系，所以也不对。故C选项为正确答案。
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