i The difficulties of talking about smells
iiThe role of smell in personal relationships
iii Future studies into smell
ivThe relationship between the brain and the nose
v The interpretation of smells as a factor in defining groups
viWhy our sense of smell is not appreciated
vii Smell is our superior sense
viii The relationship between smell and feelings
In spite of its importance to our emotional and sensory lives, smell is probably the most undervalued sense in many cultures. The reason often given for the low regard in which smell is held is that, in comparison with its importance among animals, the human sense of smell is feeble and undeveloped.
参考答案：vi
解析： C段第一句陈述了一个事实，即嗅觉是最被忽视的感官，紧接着第二句就以the reason for…陈述了原因。标题vi中why our sense of smell is not appreciated是说为什么我们的嗅觉不受到重视，即是C段所讲的内容。The reason也是对why的最好诠释。