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单选题
____
A

although

B

as

C

but

D

while


参考答案

参考解析
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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