单选题____AalthoughBasCbutDwhile
单选题
____
A
although
B
as
C
but
D
while
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。
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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