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The sense of smell may involve response to ______ which do not smell, in addition to obvious odours.

【参考答案】

chemicals

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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.

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